Effects of taurine supplementation in low fish meal diets for red seabream (Pagrus major) in low water temperature season
Fisheries and Aquatic Sciences volume 22, Article number: 23 (2019)
Taurine is a conditional essential amino acid for fish. A study was conducted to investigate the compensating effect of supplemental taurine in diets for red seabream (Pagrus major) on impaired growth performance by fish meal (FM) replacement with soybean meal (SM) at low water temperature (14.15 ± 1.95 °C).
A FM-based diet was considered as a high FM diet and three other experimental diets were formulated to replace FM with SM by 20, 35, or 50% (HFM, SM20, SM35, or SM50, respectively) without taurine and other four diets were formulated by adding 1% taurine to the diets (HFM-T, SM20-T, SM35-T, or SM50-T, respectively). Triplicate groups of fish (108.9 ± 1.58 g/fish) were distributed into 24 polyvinyl circular tanks (215 L) with 20 fish per tank and fed one of the diets to satiation for 20 weeks.
Growth performance and feed utilization of red seabream were significantly improved by the dietary taurine supplementation. SM20-T and SM35-T diets increased fish growth that are comparable to HFM diet. Feed intake, feed conversion ratio, and protein efficiency ratio of fish fed SM20-T and SM35-T diets were not significantly different from those of HFM group. Dietary taurine supplementation in each FM replaced group numerically increased innate immunity of the fish. Lysozyme and superoxide dismutase activities were significantly decreased in fish fed SM35, SM50, and SM50-T diets compared to those of fish fed HFM diet while they were not significantly lower in SM20, SM20-T, SM35, and SM35-T groups. Glutathione peroxidase activity was significantly lower in fish group fed SM50 diet while SM50-T group did not significantly lower compared to that of HFM group. The relative expression level of hepatic IGF-1 mRNA was improved in fish fed taurine-supplemented diets compared to their respective SM diets.
Growth performance and feed utilization of red seabream can be accelerated or restored by 1% taurine supplementation when they are fed high level of SM up to 35% in diets during low water temperature season.
Taurine (2-aminoethanesulfonic acid) is an amino acid which contains acidic sulfonate group and a basic amino acid group. Taurine exists naturally in animals in higher concentrations than other amino acids (Brosnan and Brosnan 2006; Salze and Davis 2015). Many studies proved that taurine is an essential nutrient for fish (Takagi et al. 2008; Lim et al. 2013; El-Sayed2014; Salze and Davis 2015) and involved in bile acid metabolism of fish (Goto et al. 1996, 2017). Therefore, taurine enhances lipid metabolism of fish and improves the absorption of fat-soluble vitamins (Kim et al. 2008; El-Sayed2014). A study conducted by Park et al. (2002) indicated that dietary taurine was involved in a metabolism of sulfur amino acids of juvenile Japanese flounder (Paralichthys olivaceus). Kim et al. (2005) found that feed intake of Japanese flounder was enhanced by a dietary taurine supplementation. Martinez et al. (2004) indicated that 0.2% taurine was required for better growth performance of juvenile seabass (Dicentrarchus labrax). In juvenile yellow catfish (Pelteobagrus fulvidraco) diet, 1.09% taurine supplementation was essential for the best growth, immunity, and disease resistance (Li et al. 2016). Growth and reproduction of yellowtail (Seriola quinqueradiata) were improved by a dietary taurine supplementation (Matsunari et al. 2006). According to these evidences, therefore, it is obvious that dietary taurine supplementation enables to provide a wide range of beneficial effects in many fishes. However, it has been reported that some fish species are unable to synthesize taurine or some fish species are able to synthesize it but lower amount than their requirements (Salze and Davis 2015).
Production of low fish meal (LFM) diets is an essential practice for the sustainable aquaculture as the price and demand of fish meal (FM) have been increased for the past decades and its supply is not predicted to increase. Numerous studies have been conducted to formulate and investigate LFM diets with plant-based ingredients due to vast availability and low price. Soybean meal (SM) contains high protein content and amino acids which are readily available and acceptable by most of the cultured fish species (Titgemeyer et al. 1989; Lim and Akiyama 1992). Many studies have been conducted to replace FM with SM and substantial results reported for many fish species (Hernandez et al. 2007; Lim and Lee 2008; Antonopoulou et al. 2017; Kumar et al. 2017; Zhang et al. 2018a). The impaired growth performance was the identified difficulty which could not be overcome even though all the nutritional requirements were fulfilled in the plant protein-based diets (Gaylord et al. 2007). Therefore, in order to restore FM effects in high SM diets, taurine has been used as a dietary supplement in diets for many fish species and successful results has been observed. In common dentex (Dentex dentex), 25% FM was successfully replaced with soy protein when 0.2% taurine was supplemented to the diet (Chatzifotis et al. 2008). Hien et al. (2015) demonstrated that 40% FM was successfully replaced for snakehead (Channa spp.) with 1% taurine supplementation. Also, Zhang et al. (2018b) successfully replaced FM up to 50% with SM and 0.1% taurine supplementation without sacrificing growth, immunity, and digestive enzyme activity of juvenile black carp (Mylopharyngodon piceus).
Red seabream (Pagrus major) is widely cultured fish species in the East Asian regions. Taurine has been tested in red seabream diet and a number of beneficial effects were observed in many studies. Growth and development were accelerated in red seabream larvae fed taurine-enriched rotifers (Chen et al. 2005; Kim et al. 2016). Also, dietary taurine supplementation alleviates chemical toxicity and bioaccumulation in red seabream (Hano et al. 2017a; Hano et al. 2017b). Several studies showed that taurine deficiency causes the green liver syndrome of fishes including red seabream (Takagi et al. 2008, 2011). Additionally, taurine supplementation was reported to have an ability to accelerate growth of red seabream when they were fed a LFM diet (Takagi et al. 2006; Takagi et al. 2010). It was documented that red seabream hardly synthesize taurine in vivo (Takeuchi et al. 2001). Consequently, several researches were conducted to find an optimum taurine level in diets for red seabream. Matsunari et al. (2008) reported that taurine requirement for juvenile red seabream is 0.5% in a casein-based diet. Recently, Salze and Davis (2015) reported that taurine requirement of red seabream varies with their growth stages and main protein sources used in their diets, and it ranges between 0.5 and 2.0%.
Water temperature is an important environmental factor which controls the growth, metabolic rate, and food consumption of poikilothermic animals including fish (Brett 1971; Jensen et al. 2000). Performance of fish under low water temperature has been examined (Öz et al. 2017, Öz et al. 2018a, b, c). Earlier, Woo (1990) reported that metabolic rate of red seabream was changed by water temperature. However, effects of low water temperature on red seabreams were not well studied up to date. Therefore, this study was conducted to evaluate the effects of taurine supplementation in diets for red seabreams when graded levels of FM were replaced by SM in the diets during the low water temperature season.
Materials and methods
Four diets were formulated to replace FM with soybean meal by 0, 20, 30, or 40% (designated as HFM, SM20, SM35, or SM50, respectively) without taurine and with 1.0% taurine addition (designated as HFM-T, SM20-T, SM35-T, or SM50-T, respectively). Dry ingredients were thoroughly mixed in a mixer and extruded through a pelletizer machine (SP-50, Gum Gang Engineering, Daegu, Korea) in a proper size. Then, the pellets were air-dried at 25 °C for 12 h and stored at − 20 °C until use (Table 1).
Red seabream was acclimatized to the experimental conditions and facilities for 2 weeks before the feeding trial. A commercial diet was fed to the fish during the period. After the period, randomly selected 480 fish (initial mean body weight, 108.9 ± 1.58 g) were distributed into 24 215 L capacity polyvinyl circular tanks with 20 fish per tank. Those tanks were supplied with sand-filtered seawater at a flow rate of 3 L min−1 and aerated to maintain sufficient dissolved oxygen level. Triplicate groups of fish were fed one of the experimental diets until satiation (twice a day, 09:00 and 18:00 h) for 20 weeks. Remaining feeds in the tanks were collected 30 min after feeding and reweighed to determine feed intake. Water temperature was dependent on the natural water temperature and maintained at 14.2 ± 1.95 °C during the feeding trial in the winter time.
Sample collection and analyses
Fish in each tank were bulk weighted and counted to calculate growth and feed utilization parameters at the end of 20 weeks of the feeding trial. Three fish per tank were sampled and stored at − 20 °C for further whole-body proximate composition analysis. Blood samples were taken from randomly captured four fish per tank. Fish were anesthetized with a 2-phenoxyethanol solution (200 ppm) before the collection of blood samples. The whole blood samples were used for analyses of hematocrit, hemoglobin, and respiratory burst activity. The plasma was separated from the whole bloods and used for determination of immunoglobulin level and biochemical parameters. Another set of blood samples were taken from four fish in each tank using non-heparinized syringes to separate serum for the analysis of innate immune parameters. The blood samples were allowed to clot at room temperature for 30 min and centrifuged for 10 min at 5000×g. Then, the serum was separated and stored at − 80 °C. All the fish were starved 24 h prior to weighing or blood sampling.
Moisture and ash contents were analyzed according to AOAC (1995). Crude lipid was determined according to Folch et al. (1957) and crude protein was analyzed by an automatic Kjeltec Analyzer Unit 2300 (FOSS, Sweden). Microhematocrit technique was used to determine hematocrit (Brown 1980). An automated blood analyzer (SLIM, SEAC Inc., Florence, Italy) was used to measure hemoglobin and plasma levels of glucose and cholesterol. The oxidative radical generation by phagocytes during respiratory burst was estimated through NBT test by Anderson and Siwicki (1995). Plasma immunoglobulin (Ig) levels were measured by Siwicki and Anderson (1993). A turbidometric method was used to measure the level of serum lysozyme (Hultmark et al. 1980) with a slight adjustment. The method described by Quade and Roth (1997) was used to measure serum myeloperoxidase (MPO) activity. Serum superoxide dismutase (SOD) activity was estimated utilizing a SOD Assay Kit (Sigma, 19160). The serum anti-protease activity was estimated by Ellis (1990) with slight alterations (Magnadóttir et al. 1999). Glutathione peroxidase (GPx) and catalase activities were assayed using kits (Biovision, Inc. California, USA).
Expression levels of liver IGF-I mRNA
Liver samples were taken from three fish per tank and frozen immediately in liquid nitrogen. Total RNA isolation and gene expression determination were conducted according to Kim et al. 2017). The 18S rRNA gene was used as the housekeeping gene. Primers were designed using the cloned sequence for both IGF-1 and 18S rRNA gene (NCBI Genbank accession no: AY996779 and AB259837). The relative expression ratio was calculated according to the mathematical model explained by Pfaffl (Pfaffl 2001): Ratio = [(EIGF-I) ΔGF (control-sample)]/[(Eactin) Ct (control-sample)].
One-way analysis of variance (ANOVA) was performed to identify statistical differences among the dietary treatments using SPSS version 19.0 (SPSS Inc., Chicago, IL, USA). When differences were identified by ANOVA, Tukey’s HSD multiple test was applied (p < 0.05). Data were presented as mean ± SD.
Growth performance and feed utilization of red seabream were significantly influenced by the dietary taurine supplementation in each FM replacement (Table 2). Final body weight (FBW) and weight gain (WG) of fish was significantly improved by dietary taurine supplementation to SM diets. Interestingly, SM20-T and SM35-T diets increased FBW and WG of fish to restore the HFM effects. Feed intake (FI), feed conversion ratio (FCR), and protein efficiency ratio (PER) of the fish fed taurine-supplemented diets were higher than those of their respective SM diets. The HFM effects were restored in fish fed SM20-T and SM35-T diets. However, reduced growth and feed utilization of red seabreams fed SM50 diet were not restored by taurine supplementation. Survival of fish was not affected by FM replacement or taurine supplementation. Hematological and biochemical parameters of red seabream were not significantly affected by dietary taurine or FM replacement (Table 3).
In the results of innate immune parameters (Table 4), the supplemental effect of taurine was not significant in each respective diet. However, dietary taurine supplementation in each FM replaced groups numerically increased the innate immunity of the fish. For the anti-protease activity, fish fed SM50 and SM50-T only showed significantly lower value than fish fed HFM diet. In GPx activity, SM50 group only exhibited significantly lower value than fish fed HFM diet, while SM50-T group did not significantly differ from the HFM group. Lysozyme and SOD activities were significantly decreased in fish fed SM35, SM50, and SM50-T diets compared to those of fish fed HFM diet. In MPO activity, no significant difference was found between HFM and other dietary groups. Whole body proximate composition and biometric parameters (Table 5) of red seabream were not significantly different after 20 weeks of the feeding trial.
The relative expression level of hepatic IGF-1 mRNA is shown in Fig. 1. Compared to HFM group, expression level was significantly higher in fish fed HFM-T and SM20-T diets. Expression level was reduced with the increase of SM levels in the diets. However, improved IGF-1 was observed in fish fed taurine-supplemented diets compared to their respective SM diets.
Growth performance and feed utilization of red seabream were improved by supplementing taurine in FM replacement diets with plant protein source. Reduced growth and feed utilization were observed in fish fed SM diets. However, SM diets supplemented with 1% taurine enhanced the growth of fish compared to their respective SM diets. Taurine is known as a feed attractant for fishes. FI of fish can be enhanced by dietary taurine supplementation (Nguyen et al. 2015; Martins et al. 2018; Wei et al. 2019). In the present study, FI of red seabream fed taurine-supplemented diets was higher than that of their respective SM diets. Therefore, it suggests that taurine-added feeds are more attractable to red seabream compared to non-supplemented SM diets and its feed palatability can be improved by taurine. Similarly, we observed that the palatability of parrot fish diet was enhanced by taurine supplementation (Lim et al. 2013). It is well known that low FI leads to reduced growth performance and feed utilization of fish as shown in the present study. The positive growth effect of FM was restored in SM20 or SM35 diets by 1% taurine supplementation. On the contrary, Biswas et al. (2007) observed that red seabream diet containing 30% SM (40% FM) without taurine was not capable to restore fish growth compared to a HFM diet (65% FM). However, in line with our study, Takagi et al. (2006) found that HFM effects can be restored in red seabream by feeding a taurine added LFM diet. HFM effects were restored in common dentex (Dentex dentex) by feeding a LFM diet in which 40% FM was replaced by SM with taurine supplementation (Chatzifotis et al. 2008). In our previous study, we observed that 30% FM was successfully replaced with SM in diet for parrot fish with 1% taurine (Lim et al. 2013). Therefore, it can be assumed that growth performance of red seabream which is negatively affected by SM can be restored or compensated by taurine supplementation to the diets containing high proportion of plant protein ingredients as FM substitutes.
Taurine can stimulate the secretion of connective tissue growth factor (CTGF) in a dose-dependent manner (Yuan et al. 2007). CTGF is rich in cysteine, mitogen, fibroblast, and angiogenic factors involved in development and regulation of tissue growth (Bradham et al. 1991; Wang et al. 2015). Therefore, taurine-supplemented diets might exhibit the ability to compensate growth of fish fed SM diets. In addition, SM contains anti-nutritional factors such as glycinin, β-conglycinin, tannin, phytic acid, saponins, and trypsin inhibitors (Francis et al. 2001). As a result of these anti-nutritional factors, growth of fishes can be reduced when they were fed diets having a high level of SM (Wilson and Poe 1985; Wang et al. 2016; Nguyen et al. 2017). Dietary SM supplementation was known to downregulate the synthesis of bile acid and enterohepatic circulation of rainbow trout (Oncorhynchus mykiss) (Murashita et al. 2018). However, Yu et al. (2013) observed that growth inhibitory effects of SM can be compensated by taurine, lysine, and methionine supplementation for juvenile obscure puffer (Takifugu obscurus). In the present study, similarly, taurine supplementation seemed to compensate the growth inhibitory effect induced by SM in red seabream.
In teleost fish, innate immunity is the most important defense mechanism against bacterial infections. Innate immune parameters of red seabream were significantly improved by the dietary taurine supplementation in the present study. However, dietary SM supplementation for FM replacement caused reduced performance of the innate immune response. Taurine exerts ability to enhance immunity of fish and shellfish. For instance, innate immune responses of olive flounder were enhanced in fish by 0.25–1.0% taurine supplementation in a FM diet (Kim et al. 2017). Dong et al. (2018) found that dietary supplementation of taurine is important to improve the innate immunity of Chinese mitten crab (Eriocheir sinensis). Immune parameters of yellow catfish (Pelteobagrus fulvidraco) were significantly enhanced by dietary taurine supplementation (Li et al. 2016). Therefore, it is believed that the increased immunity of red seabream in the present study was due to the dietary taurine supplementation. There is no report about the exact mechanisms by which taurine improve the immunity of fish. However, it was reported that taurine can enhance the functions of leucocytes (Wang et al. 2009). Leucocytes are the site for immune functions such as phagocytosis and respiratory burst. Mühling et al. (2002) observed that the generation of superoxide anion and hydrogen peroxide was decreased in human leucocytes that were incubated with taurine. On the other way, radical scavenging activity was increased after incubation with taurine. The study suggested that extracellular and intracellular taurine might act as an antioxidant to improve immune function. Accordingly, in our case, the increased SOD and MPO activities in red seabream might be attributed to the reduction of superoxide and peroxide anion by taurine supplementation in its diet indicating that the immunity of the fish fed SM diets without taurine was decreased. Previous reports elucidated that immune responses of fish can be reduced with the increase of SM level in their diets (Burrells et al. 1999; Buentello et al. 2010; Deng et al. 2013). Bakke-McKellep et al. (2000) observed a decreased immunoglobulin M level in Atlantic salmon (Salmo salar) following a SM diet feeding. Also, dietary SM increased the susceptibility of Atlantic salmon to furunculosis (Krogdahl et al. 2000) and mortality of channel catfish (Ictalurus punctatus) after a challenge against Edwardsiella ictaluri (Peres et al. 2003) as a result of reduced immunity. However, in our case, reduced immunity of red seabream fed SM diets up to 35% FM replacement was successfully recovered by 1% taurine incorporation to their respective SM diets.
In the present study, an improved expression level of IGF-1 mRNA was observed in fish fed taurine-supplemented diets compared to the respective SM diets. In a previous study, we observed that IGF-1 mRNA expression of olive flounder can be enhanced by dietary taurine supplementation (Kim et al. 2017). IGF-1, also known as somatomedin C, is an endocrine hormone which is produced in liver to mediate prenatal and postnatal growth of vertebrates (Coleman and Tsongalis 2010). IGF-1 production in fishes is stimulated by growth hormone (GH) and modulated by nutritional status (Beckman 2011). Expression of IGF-1 in fish can be downregulated by feeding a high-plant protein diet (Gaylord et al. 2007; Espe et al. 2016). Gaylord et al. (2007) observed upregulated IGF-1 expression in rainbow trout plasma when the fish was fed a taurine-supplementedall-plant protein diet. Exact mechanism for the upregulation of IGF-1 by taurine is unclear in fishes. However, GH secretion of animals was induced by taurine in previous studies (Collu et al. 1978; Ikuyama et al. 1988; Huxtable 1992; Moon et al. 2015). Also, production of IGF-1 in gilthead sea bream (Sparus aurata) was enhanced by GH administration (Pérez-Sánchez et al. 1994). Therefore, secretion of IGF-1 might be stimulated by GH in fishes. Increased GH secretion by dietary taurine supplementation might be a reason to the increased expression levels of liver IGF-1 in the present study. Moreover, Pérez-Sánchez et al. (1994) observed that hepatic IGF-1 level in gilthead sea bream was increased with the increase of feed consumption. Accordingly, FI of red seabream was increased by 1% taurine supplementation to SM diets in the present study and IGF-1 level was significantly increased with the FI.
Biochemical and biometric parameters of red seabream were not significantly affected by FM replacement with SM or taurine supplementation. In the previous studies, plasma total protein, total cholesterol, triglyceride levels, and HSI of red seabream were significantly reduced when fish were fed taurine-incorporated LFM diet in which 70% of FM was replaced with SM (Goto et al. 2001). Kim et al. (2017) observed that hematocrit and hemoglobin level of olive flounder were significantly enhanced by taurine supplementation to their diets. It seems that there is a discrepancy among biochemical and biometric results obtained from different studies on dietary taurine supplementations.
The results proved that taurine exhibits ability to alleviate negative effects caused by SM on growth performance, feed utilization, innate immunity, and IGF-1 mRNA expression of red seabream at low water temperature. Also, the optimum replacement level of FM with SM might be 35% in red seabream diet with 1% taurine supplementation. These findings will help understand the role of taurine in fishes when dietary FM is replaced with plant protein sources in a high level.
Availability of data and materials
All datasets analyzed in this study are available from the corresponding author on reasonable request.
One-way analysis of variance
Feed conversion ratio
Insulin-like growth factor 1
Messenger ribonucleic acid
Nitro blue tetrazolium
Protein efficiency ratio
Specific growth rate
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1A6A1A03033553).
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Experimental protocols followed the guidelines of the Animal Care and Use Committee of Jeju National University.
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Gunathilaka, G.L.B.E., Kim, MG., Lee, C. et al. Effects of taurine supplementation in low fish meal diets for red seabream (Pagrus major) in low water temperature season. Fish Aquatic Sci 22, 23 (2019). https://doi.org/10.1186/s41240-019-0138-z
- Red seabream
- Soybean meal
- Low fishmeal
- Hepatic IGF-1
- Growth performance
- Innate immunity