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BMC Microbiol
BMC Microbiol
BMC Microbiology
1471-2180
BioMed Central London

39245724
3459
10.1186/s12866-024-03459-2
Research
Evaluation of the synbiotic effects of Saccharomyces cerevisiae and mushroom extract on the growth performance, digestive enzyme activity, and immune status of zebrafish danio rerio
Hosseini Seyedeh Sedigheh Hosseini.s@goums.ac.ir

12
Sudaagar Mohammad 3
Zakariaee Hamideh 3
Paknejad Hamed 3
Baruah Kartik 4
Norouzitalab Parisa 4
1 https://ror.org/03mcx2558 grid.411747.0 0000 0004 0418 0096 Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, 4934174515 Iran
2 https://ror.org/03mcx2558 grid.411747.0 0000 0004 0418 0096 Department of Laboratory Sciences, Faculty of Para-medicine, Golestan University of Medical Sciences, Gorgan, 4934174515 Iran
3 https://ror.org/01w6vdf77 grid.411765.0 0000 0000 9216 4846 Department of Aquaculture, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, 4918943464 Iran
4 https://ror.org/02yy8x990 grid.6341.0 0000 0000 8578 2742 Department of Applied Animal Science and Welfare, Faculty of Veterinary Medicine and Animal Sciences, Swedish University of Agricultural Sciences, Uppsala, 7070, SE-750 07 Sweden
9 9 2024
9 9 2024
2024
24 33125 11 2023
9 8 2024
© The Author(s) 2024
2024
https://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
Background

The quest for candidate probiotics and prebiotics to develop novel synbiotics for sustainable and profitable fish farming remains a major focus for various stakeholders. In this study, we examined the effects of combining two fungal probiotics, Saccharomyces cerevisiae and Aspergillus niger with extracts of Jerusalem artichoke and white button mushroom to develop a synbiotic formulation to improve the growth and health status of zebrafish (Danio rerio). An initial in vitro study determined the most effective synbiotic combination, which was then tested in a 60-day in vivo nutritional trial using zebrafish (80 ± 1.0 mg) as a model animal. Four experimental diets were prepared: a control diet (basal diet), a prebiotic diet with 100% selected mushroom extract, a probiotic diet with 107 CFU of S. cerevisiae/g of diet, and a synbiotic diet with 107 CFU of S. cerevisiae/g of diet and 100% mushroom extract. As readouts, growth performance, survival, digestive enzyme activity and innate immune responses were evaluated.

Results

In vitro results showed that the S. cerevisiae cultured in a medium containing 100% mushroom extract exhibited the maximum specific growth rate and shortest doubling time. In the in vivo test with zebrafish, feeding them with a synbiotic diet, developed with S. cerevisiae and mushroom extract, led to a significant improvement in the growth performance of zebrafish (P < 0.05). The group of zebrafish fed with the synbiotic diet showed significantly higher levels of digestive enzyme activity and immune responses compared to the control group (P < 0.05).

Conclusion

Taken together, these results indicated that the combination of S. cerevisiae and mushroom extract forms an effective synbiotic, capable of enhancing growth performance and immune response in zebrafish.

Keywords

Probiotic
Growth
Immunity
Natural extract
Funal probiotics
Zebrafish
http://dx.doi.org/10.13039/501100008091 Golestan University of Medical Sciences 93/631191 /پ گ http://dx.doi.org/10.13039/501100008011 Gorgan University of Agricultural Sciences and Natural Resources 1397 issue-copyright-statement© BioMed Central Ltd., part of Springer Nature 2024
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pmcBackground

Research into the gut microbiota of farmed fish dates back to the early half of the 20th century but more recently, interest in this area has grown at a significant rate coinciding with the expansion of the aquaculture industry. Several lines of evidence suggest that a well-functioning gut with a balanced microbiota helps fish obtain essential nutrients necessary for growth and development [1–3]. The gut-associated microbiota consists of a diverse community of microorganisms, including bacteria, fungi, and protozoa, and they play important roles in various gut functions, such as digestion, metabolism, and immune regulation and protection against pathogens [4]. Imbalances in the gut microbiome, known as dysbiosis, caused by factors like antibiotics, poor diet, stress, or other factors, can result in the onset of poor growth and health, and the occurrence of diseases [5–7]. Thus, maintaining a well-functioning gut and a balanced gut microbiome are becoming a major focus of study [8, 9]. To promote gut health in fish, several strategies have been implemented over the past few years. One such promising approach is the use of synbiotic formulations combination prebiotics and probiotics that work synergistically to promote a healthy gut microbiome and enhance the overall performance of the organisms [10–13]. In farmed aquatic organisms, there is evidence suggesting the positive effects of synbiotics on the microbial communities in the fish gut, thereby causing beneficial effects on the health and growth performances of the fish, e.g., by averting the adverse effects caused by the infection stress, and by elevating the activities of the digestive enzymes, which eventually contribute to improved feed utilization and growth performances [14–19]. As a source of probiotics in the synbiotic formulation, a wide range of Gram-negative and Gram-positive bacteria have been examined and some were successfully used in the development of the formulation [20–22].

Recently, there has been a burgeoning interest in incorporating fungal-based probiotics in synbiotic formulations for farmed aquatic animals, which is driven by their multifaceted benefits [23]. From promoting a balanced gut microbial environment that aids in the digestion and absorption of nutrients and boosting immunity to offering a sustainable and natural alternative to unsustainable chemotherapeutics, fungal probiotics present a promising avenue for improving the growth and health performances in aquaculture species [24]. Fungal-based probiotics were shown to improve growth performance, feed efficiency, immune responses, and disease resistance in both farmed fish and shrimps, indicating their potential effectiveness as prophylactic agents against future diseases [25–27]. For instance, in whiteleg shrimp (Penaeus vannamei) feeding probiotic Aspergillus niger at a dose of 1.0–1.5 g/kg of diet for 56 days resulted in a significant improvement in growth indices, immunity, and gut microbiota [28]. This ultimately led to increased resistance of the shrimp against the pathogenic bacterium Vibrio parahemolyticus [28]. In another study carried out on common carp (Cyprinus carpio) feeding a diet supplemented with A. niger for 60 days markedly improved the growth, immunity, digestive enzyme activity, and hematological indices of the fish [29]. Overall, the research on fungi-based probiotics highlights the potential benefits of using them as an important supplement for improving gut health and performance in farmed fish [30–32].

Prebiotics are non-digestible oligosaccharides that selectively stimulate the growth and activity of beneficial microorganisms in the gut [33]. The metabolic byproducts produced by these microorganisms can have positive effects on the host’s health [34, 35]. The most studied prebiotics in fish include inulin, mannan oligosaccharides, fructooligosaccharides, galactooligosaccharides, and nano-oligosaccharides [36–41]. These types of prebiotic components are naturally present in various plant and microbial species, such as Jerusalem artichoke, mushrooms, cereals, leeks, asparagus, garlic, onion, and banana [42–45]. It is noteworthy to mention that the utilization of food-grade prebiotic compounds obtained from natural sources as functional feed additives in the aquafeed industry is constrained by the expenses associated with the extraction and isolation procedures. To tackle the issue of high production costs and minimize the waste generated from the isolation and extraction process, there has been a growing emphasis on investigating the direct utilization of raw extracts as potential sources of natural prebiotics [45]. Such natural prebiotics have been shown to serve as good substrates for fermented microorganisms, such as bacteria (e.g. Lactobacillus sp) and yeast [46–51]. In a previous study, we examined the effects of combining extracts from the Jerusalem artichokes (Helianthus tuberosus) and button mushrooms (Agaricus bisporus) with two different strains of bacterial probiotics (Lactobacillus acidophilus and L. delbrueckii subsp. Bulgaricus) on farmed fishes. The main aim of the study was to develop a synbiotic formulation that could improve the growth, survival, and reproductive performances of the fish [45]. We used zebrafish (D. rerio) as a model organism to conduct the study. The results showed that the combination of L. acidophilus or L. bulgaricus with mushroom extract caused positive effects on the growth and reproductive performances of the zebrafish [45]. In the current study, we used two fungal probiotic strains: Saccharomyces cerevisiae (ATCC-2601) and Aspergillus niger (ATCC-1004), to examine their interaction with the natural prebiotics, specifically Jerusalem artichoke and white button mushroom. We conducted an in vitro study to evaluate the ability of the extract to promote the growth of these two probiotic strains. Subsequently, we identified the most promising prebiotic candidate and combined it with each probiotic strain to explore potential synbiotic combinations. To verify the efficacy of the synbiotic preparations, we performed an in vivo experiment using zebrafish as the model organism. Our main focus was to evaluate growth traits, survival rates, and immune status as measurable indicators of the synbiotic effects. Through the analysis of these outcomess, we aimed to determine the impact of the synbiotic combination on the overall health and performance of the zebrafish.

Materials and methods

Fungal strains and Inoculum preparation

Two fungal strains, Saccharomyces cerevisiae (ATCC-2601) and Aspergillus niger (ATCC-1004) were obtained from Persian Type Culture Collection, Tehran, Iran. Stock cultures were prepared by mixing a pure culture of the lyophilized strain, grown in Sabouraud Dextrose (SD) Broth medium (Merck, Darmstadt, Germany) for a maximum duration of 72 h as previously described [52]. Briefly, stock cultures were separately inoculated in flasks containing the mentioned medium and incubated on a shaker incubator (800 x g) at 30ºC for 72 h. Inoculums were prepared by inoculating the 1 ml of fungus strain in 100 ml of SD broth (1% v/v) followed by incubation at 30 °C for a maximum duration of 72 h. First, the pH of the culture medium for A. niger and S. cerevisiae was adjusted to 4 and 5, respectively using 1 N H2S04 [52]. The media were then sterilized by autoclaving at 1210C for 15 min. For inoculation, we used a fresh volume of each microorganism.

Fungal growth analysis

The growth of S. cerevisiae and A. niger was monitored by measuring the optical cell density using a UV/Visible spectrophotometer at 600 nm (Shimidzo, Japan) [53]. The measured values were plotted on standard growth curves. The maximum specific growth rate during the exponential growth phase was calculated following the equation of Kask et al. [54]:

µ (t-t0) = Ln N-LnN0.

where t = time, N = optical density at the end of the exponential growth phase (t), N0 = optical density at the beginning of the exponential growth phase (t0), µ = specific growth rate constant (h− 1).

The doubling time was determined by the equation: Td= Ln2/µmax, where, µmax - maximum specific growth rate, td- doubling time.

Preparation of natural extracts as prebiotic

The natural ingredients, Jerusalem artichokes (H. tuberosus; hereafter referred to as JA) and white button mushrooms (A. bisporus; hereafter referred to as WBM) were procured from a private company in Iran (WBM: Dorrin company Tehran, Iran. and JA: Sanmive company, Tehran, Iran). Extracts prepared from these ingredients were used as sources of prebiotics. The preparation of the extracts was carried out following the procedure previously optimized by Zakariaee et al. [45]. Firstly, the ingredients were washed, dried, and sliced into small pieces. Subsequently, they were suspended in 0.5% (w/v) citric acid solution for 15 min to prevent browning. The ingredients were then further dried in an oven at 50˚C for 48 h. The dried samples were ground in a grinder. The extraction process was performed using the soaking method described by Harborne [55]. Briefly, 100 g of each dry powder was mixed with 1 L of distilled water and the mixture was kept in the dark for 48 h. After that, the resulting mixture was subjected to centrifugation (10 000 x g at 4˚C, 15 min) and the resulting precipitate was discarded [56]. Finally, the supernatant was filtered using a 0.22 μm syringe filter and used for preparing the desired concentration of prebiotics.

In vitro analysis of prebiotic properties of extracts

JA and WBM extracts were added to the glucose-free SD broth/agar medium at different concentrations (2, 6.25, 12.5, 25, 50, 75, and 100%). The SD broth/agar medium supplemented with glucose (SDG) as a carbon source served as a positive control. The glucose-free SD media (Mirmedia, Iran) containing JA (SDJ) or WBM (SDM) was used to cultivate the probiotic strains. The S. cerevisiae and A. niger were inoculated in 50 ml of the SDJ or SDM broth at a concentration of 107 CFUs/ml [47]. The pH of the media was adjusted to 4.5-5.0. The solutions were incubated on shaker (Incu-Shaker™ 10 L, Korea) at 30 ˚C for 120 h for SC and 160 h for AN under aerobic conditions. After incubation, the cell count was determined using a spectrophotometer (Shimidzo, Japan) by measuring the optical density at 600 nm [45, 52]. A schematic representation of in vitro experimental design is shown in Fig. 1A.

Fig. 1 Growth of Saccharomyces cerevisiae and Aspergillus niger in presence of mushroom or artichoke extract. Growth curve of A. niger and S. cerevisiae in medium containing mushroom or artichoke extract (2, 6.25, 12.5, 25, 50, 75 and 100%) as the only carbon source. A and B: growth of the two fungal strains in presence of artichoke extract. C and D: growth of the two fungal strains in presence of mushroom extract. Data are the mean of three replicates (n = 3). Positive control: Sabouraud dextrose broth medium with the standard amount of glucose; negative control 1: Free glucose Sabouraud dextrose broth medium containing a concentration of 100% of plant extract without inoculation fungi; negative control 2: Free glucose and plant extract (as a prebiotic) Sabouraud dextrose broth with fungi

Determination of viable S. cerevisiae cells

To determine the number of viable cells in CFU/ml, the samples were subjected to serial dilutions from 101 to 106 CFU/ml and plated onto SD agar supplemented with the most effective concentration of prebiotic extracts obtained from the in vitro tests. Volumes of 100, 50, 25 and 10 µL were evenly spread on SD agar plates. The Petri dishes were then incubated at 30 °C for 72 h, with daily monitoring for signs of growth. Once visible growth was detected, the colonies were counted as previously described [57].

Determination of A. niger cell dry weight

Due to the complete coverage of the culture plate surface by colonies of A. niger, it was difficult to accurately count the individual surface colonies. Therefore, an alternative and complementary method, measuring the dry weight of cells, was employed to determine the growth as an alternative to CFU/ml [52]. For A. niger, cells were collected by centrifugation at 4000 g for 30 min, followed by filtration using Whatman filter No. 1. The filtered solution was then washed with distilled water to remove any residual substrates and subsequently dried in the hot air oven at 70 °C. The weight of the filter paper was measured before filtering the solution, and after drying, the combined weight of the filter paper and cells was measured. The cell dry weight was calculated as follows: Cell dry weight = weight of filter paper and cell after drying – weight of filter paper only, as previously described [52].

Final pH of the culture medium

The final pH of the resulting fermented broth was measured using pH meter (Mettler- Toledo AG, 8603 Schwerzenbach, Switzerland) [58, 59].

Diet preparation

A commercial diet sourced from the Blue Line Company (Italy, Almenno San Bartolomeo) was used as the basal diet, and it served as the basis for the experimental diets. The proximate composition of the basal diet is mentioned in Table 1. Based on the outcome from the in vitro studies (see Fig. 1A), we selected only S. cerevisiae and designed four experimental diets: Diet 1 served as the control diet, Diet 2 consisted of the basal diet supplemented with 1% WBM extract, Diet 3 included the basal diet supplemented with S. cerevisiae at a concentration of 107 CFU/g of diet, and Diet 4 combined the basal diet with S. cerevisiae at 107 CFU/g of diet along with 1% WBM extract. The supplements were carefully sprayed onto the feed, manually mixed, and each experimental diet was coated with 5% gelatin. To avoid any potential effects of gelatin, the control diet was also coated with 5% gelatin. Subsequently, all diets were dried at room temperature (25 °C) in a clean environment and stored at 4 °C until use. The diets were prepared every week throughout the feeding trial, and random samples of diets containing probiotics were analyzed for microbial viability by culturing in SD broth/agar, following the methodology described by Zakariaee et al. [45]. Briefly, 1 g of experimental diets was cultured in 100 ml of standard broth media (SD) and incubated at 30 °C for 72 h. Subsequently, a known volume of the culture was transferred to SD-agar-based media and cultured under the same conditions. Once visible growth was observed, the colonies were verified based on visual observation under microscope and were counted following standard procedure [45, 60].

Table 1 Chemical components of the using diet for the experiment (blue line/Italy)

Chemical composition	(%)	
Dry matter	0.5	
Crude protein	60	
Crude lipid	17	
Ash	10.5	
Mineral premix	%	
Na total	0.5	
Ca total	1.5	
P total	1.8	
Vitamin premix	in per kg of feed	
A	1000 Ul	
D3	1000 Ul	
E	300 mg/kg	

Experimental animals and design

Zebrafish (Danio rerio) larvae were obtained from a private farm in Gorgan, Golestan province, Iran. The larvae were acclimatized to the experimental conditional for a period of two weeks. Throughout this acclimatization phase, the larvae were fed ad libitum with a basal diet. Regular monitoring was conducted to assess the health and performance of the larvae. No mortality was recorded during the acclimatization period. After the two-week acclimatization, a total of 240 larvae, regardless of gender, with an average initial weight and length of 80 ± 1.0 mg and 16.0 ± 0.3 mm, respectively, were randomly divided into four experimental groups (diets 1 to 4 as mentioned above). Each group was maintained in three replicates, with 20 fish stocked in an aquarium (12 aquaria with a capacity of 60 L, containing 30 L of water). For details of the experimental design, please refer to Fig. 1B. Continuous aeration was provided to all the aquaria throughout the culture period. The larvae were fed three times per day (08:00, 12:30 and 18:00 h) at a rate of 5% of the body weight for 60 days [37, 60–62]. Approximately 25% of the water in each tank was replaced after removing uneaten feed and fecal matter, which was siphoned daily. The experimental conditions were conducted following the specifications outlined in Table 2 [45, 63]. No mortality was observed during the feeding period. The handling and maintenance of the zebrafish larvae adhered to the ethical guidelines for in vivo experiments set forth by the Golestan University of Medical Sciences. This accreditation complies with accepted national and international ethical norms and principles for biomedical research, as well as the guidelines and protocols of the Ministry of Health and Medical Education of the Islamic Republic of Iran (Approval ID: IR.GOUMS.REC.1397.262). The schematic representation of in vivo experimental design is presented in Fig. 1B.

Table 2 Water quality parameters during the experiments

Parameters	Temperature (°C)	pH	Total hardness
(mg L− 1)	Dissolved oxygen
(mg L− 1)	light-dark cycles (h)	
Range	25 ± 2	7 ± 0.2	300 ± 10	7.1 ± 0.9	14 − 10	

Sample collection and growth analysis

At the end of the feeding trial, the growth and survival of the fish were measured with precision levels of 0.001 g and 1 mm, respectively [45], and later calculated the following standard formulae [64, 65]:

Weight gain percentage (%) = (W2 (mg) -W1 (mg)) / W1 (mg) × 100.

Specific growth rate (% day− 1) = (LnW2-LnW1) × 100/t (day).

Food conversion ratio = feed intake (mg)/weight gain (mg).

Condition or K factor (mg/mm3) = final weight (mg) / final length (mm)3 × 100.

Protein efficiency ratio = (body weight gain (mg) /protein intake (mg).

Survival rate (%) = number of fish survived after 60 days /initial number of fish stocked × 100.

Where W2, W1 and t represent final weight (mg), initial weight (mg) and the trial period (day), respectively.

Following a period of 60 days, fish in each tank that were not fed for 24 h, were randomly sampled (10 fish per aquarium /30 fish per treatment) and immediately anesthetized using a solution of 200 mg of clove powder dissolved in 1 L of water [45]. Either whole fish or entire intestine was sampled as described in the sections below for further analysis.

Intestinal digestive enzyme activity

The colorimetric measurement for the activities of intestinal digestive enzymes, namely protease, lipase and amylase, was conducted following the protocol described by Ashouri et al. [66]. To perform this analysis, the entire intestine was collected from nine fish (three fish per replicate per treatment) that were starved for 24 h. The fish were transferred to the microbiology laboratory, where they were euthanized with 500 mg L− 1 clove powder and dissected [45]. The intestine was removed, rinsed using distilled water, dried with paper towels, and homogenized with 30 g of tissue in 70 mL of distilled water using a homogenizer (Digital Disperser, IKA’s ULTRA-TURRAX, Germany). Subsequently, the samples were centrifuged at 10,000 g for 25 min at 4 °C [63]. The resulting supernatant was then immersed in liquid nitrogen and stored at -80 °C until further analysis [66].

The activities of amylase, lipase, and protease were measured using starch, α-naphthyl caprylate, and azocasein as substrates, respectively. Measurements were made using a UV spectrophotometer (Shimidzo, Japan) at specific OD: 550 nm for amylase, 540 nm for lipase, and 366 nm for protease [63, 66]. The specific enzyme activity was expressed as enzyme unit (U) per gram of protein (g protein− 1).

Whole-body sample preparation

To prepare whole-body samples, we followed the previously described method [67]. Briefly, a total of 9 fish (3 fish per replicate per treatment) were randomly collected and anesthetized as described above. The entire body of each fish was homogenized in a sterile falcon tube containing 25mM Tris − HCl buffer (pH 7.2). The protocol described by Pedroso et al. [68] was employed for the subsequent measurements. The homogenized fish samples were centrifuged at 4000 g at 4 °C for 15 min. The resulting supernatant was carefully collected, divided into smaller aliquots, transferred into clean sterile microtubes, and stored at -80 °C for further analysis of metabolic enzyme activity, stress indicators and immunoglobulin levels (Ig) [69, 70].

Whole-body metabolic enzyme activity

The activities of metabolic enzymes, alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP) in the whole body were evaluated using commercial kits (Paadco, Tehran, Iran) according to the manufacturer´s instructions. The absorption readings were obtained using a spectrophotometer (Shimidzo, Japan) at an OD of 340 nm for AST and ALT, and 405 nm for ALP.

Stress-related indices

Whole-body cortisol level was measured using a commercial ELISA kit (Pars Azmoon, Tehran, Iran) following the protocol provided by the manufacturer. Glucose levels were measured using commercial kits (Pars Azmoon, Tehran, Iran) through a single-point method using the glucose-hexokinase enzyme assay according to the manufacturer´s instructions [71].

Immune indices

Four immune-related molecules, namely total protein, albumin, immunoglobulin, and lysozyme were analyzed to assess the immune response. The total protein concentration was determined using the Bradford method, with bovine albumin as the standard [72]. The albumin levels in the whole-body samples were measured at acidic pH using the Bromocresol Green reagent [73]. Total immunoglobulin levels (Ig) were measured following the method described by Siwicki et al. [74]. Briefly, the total protein level was measured using the aforementioned method, and then the immunoglobulin molecules were estimated by adding 12% polyethylene glycol solution to the samples. After centrifugation, the protein level was measured again using the Bradford method. The difference in protein content was considered as the Ig content.

The lysozyme activity was determined by adding 50 µL of whole-body sample to a 2 mL suspension of lysozyme-sensitive bacterium, Micrococcus lysodeikticus, suspension, for lysis. The reaction was carried out at room temperature (25 °C), and absorbance was measured using US spectrophotometer at 450 nm after 0.25 min and 5 min [75].

Statistical analysis

The data were checked for normality and homoscedasticity requirements as necessary by employing Levene´s tests, using the statistical software Statistical Package for the Social Sciences (SPSS) version 16.0. The data that satisfied those requirements were then further analyzed by employing a one-way analysis of variance (ANOVA). The differences between the means of treatments were determined using Duncan’s multiple range tests at P < 0.05 significance level.

Results

Impact of the natural extracts on the growth dynamics of the fungal probiotic

The growth rate of probiotics, S. cerevisiae and A. niger, varied over time when cultured in the different experimental media containing either artichoke or mushroom extract (0, 2, 6.25, 12.5, 25, 50, 75, or 100%) (Fig. 2A and D). Negative control groups, lacking substrate as a carbon source, showed no growth. However, when the glucose-free medium was supplemented with JA or WBM extract as substrate, a marked increase in the growth of both probiotics was observed. The maximum improvement in the growth of S. cerevisiae and A. niger was recorded in the medium containing 100% artichoke or mushroom extract. In the subsequent test, we therefore used this dose.

Impact of the natural extracts on the specific growthrate, doubling time of the fungal probiotics, and the pHof the culture media

This analysis was conducted to compare the two extracts and determine which one had the most significant impact on promoting the specific growth rate and doubling time, of the fungal probiotics, S. cerevisiae and A. niger. We have used 100% JA and WBM extract separately as the sole carbon source. These doses were chosen based on their optimal performances in the growth dynamic studies. As shown in Fig. 3A, S. cerevisiae had a significantly higher specific growth rate compared to A. niger in a medium containing 100% mushroom or artichoke extract (P < 0.05). Moreover, in the 100% mushroom extract, the specific growth rate of S. cerevisiae was significantly higher than that in the 100% artichoke extract.

The doubling time of S. cerevisiae in a medium containing either 100% mushroom or artichoke extract was significantly shorter than that of A. niger cultured in the same extract concentration (P < 0.05; Fig. 3B). S. cerevisiae cultured in the medium containing 100% mushroom extract showed the lowest doubling time among the different experimental groups.

The pH of the SD medium supplemented with mushroom extract and cultured with S. cerevisiae was significantly low. In contrast, the SD medium containing artichoke extract and cultured with A. niger had the highest pH, which was not significantly different from the medium containing mushroom extract and A. niger (Fig. 3C).

Considering that production time determines the value of a product, S. cerevisiae and mushroom extract (100%) were chosen to develop a synbiotic formulation and conduct validation studies with zebrafish.

Fig. 2 Comparison of (A) µ max (h− 1) and (B) doubling time (h) and (C) final pH of the synbionts in presence of plant extract. A. niger and S. cerevisiae were culture in 100% of mushroom and artichoke extracts. Data are the mean of three replicates ± SE. Different letters display significant difference in each column (P < 0.05)

Fig. 3 Growth curve of synbionts in presence of artichoke or mushroom extract. (A) Growth of S. cerevisiae in medium containing 100% Jerusalem artichoke or mushroom extracts as an only carbon source. For these symbionts, visible colonies could be counted (B) Growth of A. niger in medium containing 100% Jerusalem artichoke or mushroom extracts as an only carbon source. For this experiment, colonies were not visible, therefore, dilutions series were made and dry weight was measured as an indicator for the growth of this fungus

Viability of S. cerevisiae cells

The viability of the S. cerevisiae cells in the synbiotic formulation containing 100% Jerusalem artichoke and mushroom extracts as the only carbon source was determined by measuring the colonies grown for approximately 200 h. The maximum number of S. cerevisiae live cells was recorded 72 h after inoculation. At 192 h after inoculation, no living cells were observed on the culture medium containing 100% Jerusalem artichoke or 100% mushroom extracts (Fig. 4A).

Fig. 4 Growth performance and survival of zebrafish (Danio rario) fed with different supplementation diets for 60 days. (A) Initial length (mm), (B) final length (mm), (C) Initial body weight (mg), (D) final body weight (mg), (E) Weight gain percentage (%), (F) Specific growth rate (% day− 1), (G) Feed conversion ratio, (H) Protein efficiency ratio, (I) Feed intake (g), (J) K Factor (mg mm3), K) Survival (%). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Cell dry weight

The highest amount of cell dry weight of A. niger was noted at 240 h after inoculation, which was more than 1 mg/ml (Fig. 4B).

Impact of the prebiotic formulation on the growth performance and survival of zebrafish

The effects of the experimental diets on the growth, feeding efficiency and survival of the fish were evaluated after a 60-day feeding trial, and the results are shown in Fig. 5. At the start of the feeding trial, the fish in all experimental groups had a weight range of 80 and 81 mg, and the length ranged between 16.2 and 16.8 mm, with no significant differences observed among them (Fig. 5A and C). At the end of the trial, there was no significant difference in terms of length among the fish in different experimental groups (Fig. 5B). However, the experimental diets showed significant improvements (P < 0.05) in final weight, weight gain, specific growth rate (SGR), food conversion ratio (FCR), and protein efficiency rate (PER) compared to the control group (Fig. 5; D to H). Feeding the larvae with mushroom extract or S. cerevisiae resulted in a weight gain increase of 35.2% and 39.7%, receptively, compared to those fed with the control diet (Fig. 5E). The synbiotic diet further significantly increased the weight gain (P < 0.05) by 70.8% compared to the control, and by 31.1% and 35.5% compared to larvae fed with mushroom extract or S. cerevisiae-supplemented diet, respectively (Fig. 5E). While there was no significant (P > 0.05) difference in feed intake among the various experimental groups (Fig. 5I), larvae fed with the test diets exhibited a significant (P < 0.05) increase in SGR and a reduction in FCR. The most prominent effect was observed with the synbiotic diet, which increased the SGR by 0.45% and reduced the FCR by 0.81% compared to the control group (Figs. 5F and 5G). A similar trend was observed for the PER of the larvae: groups fed with diets supplemented with mushroom extract, S. cerevisiae, and the synbiotic formulation significantly increased PER by 0.20, 0.22, and 0.40%, respectively, compared to the control group (Fig. 5H). No mortality was recorded during the feeding period, and the condition factor of the fish remained the same among the different experimental groups (Fig. 5J and K).

Fig. 5 Digestive enzyme activity of zebrafish fed with different diets for 60 days. The group fed no feed supplement was maintained as control; (A) Amylase (U g protein− 1), (B) Protease (U g protein− 1). B) Lipase (U g protein− 1). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Impact of the prebiotic formulation on the activity of digestive enzymes

The activity of digestive enzymes was notably influenced by the experimental diets, as shown in Fig. 6. The zebrafish group that was fed with the synbiotic diet displayed a significantly higher level of amylase activity. The amylase activity in the synbiotic-fed group was 1.5-fold higher than that of the control group. However, there was no significant difference in amylase activity between the control group and the groups that received a diet supplemented with either mushroom extract or S. cerevisiae (P > 0.05; Fig. 6A).

The protease enzymes exhibited significantly higher activity in all the groups that were fed the test diets (P < 0.05; Fig. 6B). The group that received the synbiotic diet showed the highest protease activity. Compared to the control group, the experimental groups that received a diet supplemented with mushroom extract, S. cerevisiae, or the synbiotic had 1.7, 1.4 and 1.9-times higher protease activity, respectively, compared to the control group (P < 0.05). A comparable pattern was recorded in the lipase activity (Fig. 6C). The group fed with synbiotic showed the highest level of lipase activity, surpassing the control group. The group that was fed a diet supplemented with S. cerevisiae had the second highest lipase activity. In comparison to the control group, the lipase activity was 1.7 times higher in the S. cerevisiae fed group and 1.7 times higher in the synbiotic-fed group. The mushroom-fed group displayed a 1.3-fold increase in lipase activity compared to the control group.

Fig. 6 Metabolic enzymes in zebrafish fed with different diets for 60 days. The group fed with no feed supplement was maintained as control; (A) ALP (U L− 1), (B) ALT (U L− 1), (C) AST (U L− 1). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Impact of the prebiotic formulation on the whole-body metabolic enzyme activity and stress indicators

Feeding of diets supplemented with mushroom extract and S. cerevisiae, alone or in combination (i.e. synbiotic formulation) did not cause any significant effect on the activity of alkaline phosphatase (Fig. 7A), aspartate aminotransferase (Fig. 7B), and alanine aminotransferase enzymes (Fig. 7C). Likewise, the levels of glucose and cortisol, measured at the whole-body level, remained unchanged in response to the feeding of the experimental diets (Fig. 8).

Fig. 7 Stressed indicators of zebrafish fed with different diets for 60 days. A group without site supplement was maintained as control; (A) Glucose (mg mL− 1), (B) Cortisol (µg mL− 1). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Fig. 8 Non-specific immunity responses in zebrafish fed with different diets for 60 days. A group without site supplement was maintained as control; (A) Total protein (g dL− 1), (B) Total immunoglobulin (g dL− 1), (C) Albumin (g dL− 1), (D) Lysozyme activity (U mg protein− 1). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Impact of the prebiotic formulation on the immune responses in zebrafish

Feeding zebrafish larvae with a diet supplemented with mushroom extract and S. cerevisiae alone significantly increased the levels of total protein (Fig. 9A) and lysozyme (Fig. 9B) compared to the control. However, the increase in the levels of these readouts was less prominent compared to the group fed with the synbiotic diet. The group fed a diet supplemented with the synbiotic formulation exhibited a significantly higher level of total protein compared to the control group (2.2-fold increase), while the groups fed with a diet with either mushroom extract or S. cerevisiae as a supplement showed a 1.3-fold higher protein level than the control group. There was no significant difference in total protein levels between the group fed a diet with mushroom extract and those fed a diet with S. cerevisiae (P > 0.05). Additionally, the synbiotic-fed group showed the highest level of lysozyme among all the experimental groups.

The levels of immunoglobulin and albumin in the groups fed with dietary mushroom extract did not significantly differ from the control group (Fig. 9C and D). However, the group fed with dietary S. cerevisiae had a significantly higher level of albumin than the control group. There was no significant effect of dietary S. cerevisiae on the total immunoglobulin level. However, feeding the larvae with a dietary synbiotic resulted in a significant increase in both immunoglobulin and albumin levels, with the highest increment observed among all the experimental groups.

Fig. 9 Immunity responses in zebrafish fed with different diets for 60 days. A group without site supplement was maintained as control; (A) Total protein (g dL− 1), (B) Total immunoglobulin (g dL− 1), (C) Albumin (g dL− 1), (D) Lysozyme activity (U mg protein− 1). Bars with different letters represent significant differences among groups (Duncan’s test, P < 0.05)

Discussion

In a previous study, we examined the two natural extracts Jerusalem artichokes and button mushrooms with two different bacterial probiotics Lactobacillus acidophilus and L. bulgaricus to develop a synbiotic formulation [45]. We examined the effect of the synbiotic on its potential to improve the growth and reproductive performances of farmed aquatic animals using zebrafish as a model organism [45]. The results showed that a synbiotic formulation, developed with the selected combination of L. acidophilus, L. bulgaricus, and 50% mushroom extract, showed a positive influence on the growth and reproductive performances of the zebrafish, suggesting that the combination of the mushroom extract with the probiotic bacteria L. acidophilus or L. bulgaricus could be a potential synbiotic for the successful production of aquaculture species. While prebiotics are commonly associated with supporting the growth of bacterial probiotics, a limited number of studies have highlighted the potential of natural extracts as prebiotics for enhancing the growth of fungal probiotics [76–78]. Building upon the findings of our earlier study [45], we carried out the present study to investigate the effectiveness of the Jerusalem or mushroom extract as a prebiotic for fungal probiotics, S. cerevisiae and A. niger to develop a synbiotic formulation. In the present study, we used fungal-based probiotics owing to their multi-functional biological activities and assessed multiple biological endpoints, such as growth traits, immune and stress biomarkers, and digestive and metabolic enzymes. These fungal species were chosen based on their availability, commercial significance, and documented evidence of positive effects on growth performance and health status in farmed animals [79–83]. At first, we used an in vitro approach to monitor the growth dynamics of the test probiotics in the presence of the different doses of the natural extracts to select interesting combination(s) for further verification under in vivo conditions. The results showed that the growth dynamics of S. cerevisiae was most prominent when cultured in a medium containing 100% mushroom extract as manifested by a higher growth rate and lower doubling time of this species in the presence of 100% mushroom extract compared to 100% artichoke extract. This suggests that mushroom extract exhibited stronger prebiotics effects, promoting robust growth of S. cerevisiae. The presence of varying types of fermentable fibers or other beneficial prebiotic components in mushroom extracts, such as chitin, hemicellulose, β- and α-glucans, mannans, which are preferred by S. cerevisiae for fermentation [51, 84–87] may be responsible for these effects. Our suggestion that S. cerevisiae ferments mushroom extract more efficiently is supported by the significant decrease in pH of the medium containing 100% mushroom extract, compared to the medium containing 100% artichoke extract and A. niger. The marked decrease in pH indicates a high level of microorganism activity and a substantial production of short-chain fatty acids, which is often considered an important indicator of carbohydrate fermentation [87–91]. Additional tests using cell count, colony-forming units, and cell dry weight confirmed that S. cerevisiae growth, viability and biomass production in the medium supplemented with mushroom extract were higher than those in Jerusalem extract. This confirmed that fermentation occurred, and despite a slower growth rate and fermentation process, the cell dry weights and viability were higher in the presence of mushroom extract, supporting our previous explanation that the degree of polymerization of prebiotics justifies the rate of fermentation.

Next, we proceeded to formulate a synbiotic by combining the optimized dose of the mushroom extract with S. cerevisiae and validated the potential positive impacts of this combination on the growth performance and overall health status of zebrafish, which served as the in vivo model organism in our study. The results suggested that the synbiotic formulated using S. cerevisiae and mushroom extract had a positive effect on the growth performance and feed efficiency in zebrafish. The weight gain percentage, after 60 days of feeding, of the synbiotic-fed group increased to 201%, compared to 130.2% for the control group, and 165.5% and 170% for the groups fed with either mushroom extract or S. cerevisiae alone, respectively. Accordingly, the synbiotic-fed group exhibited an increase in the SGR by a fold of 1.3 compared to the control. This resulted in an FCR that was significantly lower for the synbiotic-fed group. It is important to note that the synbiotic-fed group had the highest protein efficiency ratio among all the experimental groups, despite the fact that these groups received the same amount of dietary protein and had the same level of feed intake. Our findings also indicated that the condition factor (K), which serves as an indicator of the overall health of the fish, remained within the optimal range throughout the entire duration of the experiment [92, 93]. This was further reflected in the survival rates, as no significant mortality was observed in response to feeding the experimental diets. These results suggest that the 100% mushroom extract and selected S. cerevisiae, whether used alone or in combination, did not have any detrimental effects on the fish under our specific experimental conditions. Therefore, they can be considered safe for the farmed species for inclusion in fish feed. There are several possibilities to explain the observed growth improvement in zebrafish when fed with synbiotic-supplemented diet. The first is the fermentation of the prebiotic components in the mushroom extract (e.g. chitin, mannans, galactans, xylans, glucans, krestin, lentinan, and hemicellulose) by the fungal probiotic, stimulating the proliferation of fungal and other beneficial microbes and inhibition of potentially pathogenic organisms in the gut. The second is the improvement of digestion and nutrient utilization by increasing enzymes produced by the microbes and host. The third is the production of vitamins and short chain fatty acids and other beneficial metabolites for the host, and the fourth is the improvement in the immune status of the fish [94–99]. The beneficial effects of mushroom extract or S. cerevisiae on the growth performances of farmed fishes are well documented but no information is available on the growth performances of fish fed on synbiotic formulation based on mushroom extract and S. cerevisiae. However, enhanced growth performance has been previously reported in rainbow trout fed on synbiotics of fungal and fructooligosaccharides [100], and in the zebrafish fed a diet supplemented with synbiotics, developed from probiotic bacteria and conventional prebiotics, such as FOS, MOS and β-glucan [41, 45, 101, 102], findings in agreement with that of our study.

We did not analyze the impacts of the synbiotic developed on the gut microbiome as well as on the production of metabolites in the gut to corroborate these factors with the observed growth performances. However, we focused on the activities of the major digestive enzymes (i.e., amylase, protease, and lipase) to substantiate our argument that the growth-promotion effects observed in zebrafish were related to the improvement in the activities of digestive enzymes. The results showed that zebrafish fed on a synbiotic-supplemented diet exhibited the highest activities of amylase, protease, and lipase enzymes. The increased activities of the enzymes might have contributed to the better digestion of dietary nutrients, such as protein and lipids [102, 103]. This in turn might have led to more efficient feed utilization and improved growth performance as observed in our study [104, 105]. The higher PER value in the synbiotic-fed group that coincides with higher protease activities in this group is a clear indication that synbiotic supplementation facilitated the process of digestion, absorption and utilization of dietary nutrients. The causes for the improvement of digestive enzyme activity could be due to: (i) creation of a healthy gastrointestinal microbial ecology by the synbiotic and/or (ii) modification in the secretion of bacterial and/or host enzymes [106]. Similar results have also been reported in earlier studies on synbiotic based on sodium alginate and Pediococcus acidilactici in Asian sea bass Lates calcarifer [66].

Alkaline phosphatase (ALP) is a phosphomonoesterase enzyme found in different tissues of fish, including the liver, intestine, kidney, gills, and bone. In fish, it plays essential functions in the processes of detoxification, nutrient digestion, absorption, and phagocytosis [107, 108]. ALP is typically used as an indicator of liver health due to its presence in liver tissues and its sensitivity to changes in liver function [109–112]. Elevated levels of ALP activity in the blood can suggest liver damage or dysfunction. Therefore, measuring ALP activity is a common diagnostic tool to assess liver health in fish. In our study, feeding zebrafish with a diet supplemented with mushroom extract or S. cerevisiae alone or in combination did not cause a marked change in the whole-body ALP activity when compared to the control group. This indicates that the dietary supplements have no adverse effect on the zebrafish organs and hence on the health performance of the fish.

Additionally, we also measured cortisol and glucose levels in the fish to evaluate the physiological responses and metabolic changes in the fish due to feeding synbiotics. Cortisol is a stress hormone produced by the fish in response to changes in their environmental conditions and nutritional factors [115–117]. Glucose, on the other hand, serves as a vital energy source for fish, supporting their metabolic processes and physiological functions [118, 119]. The combined analysis of cortisol and glucose levels allows to understand the impact of synbiotic feeding on fish stress levels, energy metabolism, and overall health [120, 121]. Cortisol and glucose levels were shown to be directly influenced by stressful and unfavourable conditions [122]. The release of cortisol and glucose is influenced by various factors such as food, stress, culture conditions, disease, and water quality indices [123, 124]. Our results showed that dietary synbiotics caused no effect on the cortisol and glucose levels when compared with the group fed control diet. Since cortisol and glucose are commonly used as stress indicators, the lack of changes in their levels in the treatment groups suggests that the synbiotic diet caused no nutritional stress conditions in the fish [125]. The effects of feeding synbiotics on the cortisol and glucose levels in fish have yielded mixed results. Some studies have reported no significant effects on these parameters, while others have observed increased or decreased levels of glucose and cortisol. For instance, Yu et al. [123] observed an increase in the serum glucose content in the white-legged shrimp Litopenaeus vannamei fed a diet supplemented with Bacillus sp. and medicinal herbs. On the other hand, Sadat Hoseini Madani et al. [124] reported lower plasma glucose and cortisol levels in shrimp fed probiotic belonging to Bacillus species. Both these findings contrast with our results. These discrepancies in the findings can be attributed to several factors like variations in experimental design, such as fish species, initial metabolic and health status of the experimental fish, feeding duration, specific combination of probiotics and prebiotics used in the synbiotic formulation, and dosage of synbiotics administered.

Total blood protein is a valuable indicator of health and stress in various organisms, including fish [126, 127]. It refers to the combined concentration of proteins in the blood, encompassing albumins, globulins, enzymes, hormones, and immunoglobulins. Our study used whole-body extract of zebrafish larvae to measure total blood protein levels indirectly. The highest total protein levels were recorded in zebrafish fed with a synbiotic diet. In agreement with our results, there were earlier reports showing positive correlation between fish immune status and the level of total serum protein in fish fed with various fungal and mushroom products alone or in combination [26]. For instance, Abdel-Tawwab et al. [128] reported increased serum total protein, albumin, and globulin were observed in Nile tilapia fed Yucca schidigera and fungal. However, whole-body extracts contain protein from various tissues, which may not accurately reflect total blood protein levels to indicate accurately the overall health condition of fish. We therefore carried out further analysis of the whole-body samples for albumin, total immunoglobulin and lysozyme levels - key components of the defence system in fish that contribute markedly to the immune response in fish, albeit through different mechanisms. Albumins support immune function by aiding in the transport and distribution of immune-related molecules (e.g. antibodies, immune cells), while lysozymes combat microbial pathogens by degrading their cell walls. Our study found increased albumin, total immunoglobulin levels, and lysozyme enzyme activity in zebrafish fed with synbiotics compared to the control group. These results are consistent with previous studies showing the positive effects of fungal-enriched diets on fish immunity. For example, there was a marked enhancement in lysozyme activity and total immunoglobulin level in Cyprinus carpio, Oncorhynchus mykiss, Huso huso, Pagrus major, Sciaenops ocellatus, Channa striata, and Oreochromis niloticus fed with diets supplemented with fungal product [129–137]. The observed increase in immune molecules in the synbiotic-fed group could be due to polysaccharides, such as β-glucan, mannan oligosaccharides, chitin in the mushroom extract as well as in the fungal S. cerevisiae, and the production of beneficial bioactive components by S. cerevisiae like vitamins, short-chain fatty acids in the gut of zebrafish. However, these are pure speculations, and warrants further research.

Conclusion

In summary, the in vitro assay demonstrated that the fungal probiont S. cerevisiae exhibited a preference for mushroom extract as a prebiotic. Subsequently, a synbiotic formulation was developed using the selected combination of 107 CFU/mL of S. cerevisiae and 100% mushroom extract. This synbiotic formulation showcased positive effects on the growth performances and health conditions of zebrafish, serving as an in vivo model organism. Our findings also suggest that the improvement in the growth performance was associated with a marked increase in the activities of digestive enzymes and immune responses, which possibly contribute to better nutrient utilization. Taken together, these results indicate that the combination of S. cerevisiae and mushroom extract holds promise as a potential synbiotic for aquaculture species. Further research is necessary to validate this formulation through on-farm nutritional trials in economically significant aquaculture species.

Acknowledgements

The authors are grateful to the technical staff of the Gorgan University of Agricultural Sciences and Natural Resources, Iran for their excellent technical assistance,

Author contributions

HZ conducted the experiment and executed most of the data processing and analysis. MS, SH, and HP participated in the designing of the experiments and data analysis, SH and MS guided and supervised the work. HZ, KB and PN wrote the bulk of the manuscript and critically edited by MS, SH, and HP. All authors contributed to the article and approved the submitted version.

Funding

This present study is conducted at Gorgan University of Agricultural Sciences and Natural Resources (Iran) and supported by the project grant provided by Golestan University of Medical Sciences (Iran). The authors wish to express their thanks for the financial support of the research.

Data availability

No datasets were generated or analysed during the current study.

Declarations

Ethics approval

The zebrafish larvae were kept and handled following the ethical guidelines for in vivo experiments developed by the Golestan University of Medical Sciences. This accreditation is valid within the framework of the accepted national and international ethical norms and principles for biomedical research as well as the guidelines and protocols of the Islamic Republic of Iran, Ministry of Health and Medical Education (Approval ID: IR.GOUMS.REC.1397.262).

Consent for publication

Not applicable.

Competing interests

The authors declare no competing interests.

Abbreviations

CFU colony-forming unit

SD Sabouraud Dextrose

AN Aspergillus niger

SC Saccharomyces cerevisiae

JA Jerusalem artichokes

WBM white button mushroom

SDJ The glucose-free SD media, with JA

SDM The glucose-free SD media, with WBM

ALT Alanine aminotransferase

AST Aspartate aminotransferase

ALP Alkaline phosphatase

Ig immunoglobulin

SGR Specific growth rate

FCR Food conversion ratio

PER Protein efficiency rate

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Kartik Baruah and Parisa Norouzitalab these authors shared the senior authorship.
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