Effect of dietary taurine supplementation on growth, digestive enzyme, immunity and resistant to dry stress of rice field eel (Monopterus albus) fed low fish meal diets

Abstract

This study was conducted to evaluate the effect of dietary taurine supplementation on growth, immunity and resistant to dry stress of rice field eel (Monopterus albus) fed low fish meal diets. Six isonitrogenous and isolipid diets (32% fish meal) supplemented with six taurine concentrations (0, 0.3, 0.6, 0.9, 1.2 and 1.5 g/kg; designated as T 0 , T 0.03 , T 0.06 , T 0.09 , T 0.12 and T 0.15 groups, respectively) were prepared.A diet including 42% fish meal (FM group) was also included as a reference. The results showed that specific growth rate (SGR) in FM group was significantly higher than that in lower fish meal treatments. SGR significantly increased and slowly decreased with the increase in taurine supplementation level. Lipase activity value in intestine of M. albus fed FM diet was maximum, and with the increase in taurine supplementation level, lipase activity significantly increased and slowly decreased. The FM group had relative higher total antioxidant capacity (T-AOC) content, catalase (CAT), total superoxide dismutase (T-SOD), and lyzozyme (LZM) activities in serum than the other groups. With the increase in dietary taurine supplementation level, the CAT, T-SOD, T-AOC and LZM activities in serum significantly increased and then decreased. In the dry stress experience, the adrenaline (AD), cortisol (COR), glucose (GLU), total cholesterol (CHOL), and malondialdehyde (MDA) concentrations, T-AOC content, CAT and T-SOD activities in serum of M. albus in the four groups first increased and reached the peak at 2 hr, and then decreased under air-exposure stress. Compared to the FM group, T 0.15 group had relative higher T-AOC content, CAT and T-SOD activities, and lower AD, COR GLU, TC and MDA concentrations. K E Y W O R D S dry stress, immunity, low fish meal, Monopterus albus, taurine wileyonlinelibrary.com/journal/are Aquaculture Research. 2018;49:2108-2118.

Evaluation of soybean meal as alternative to fish meal in diet for juvenile Asian red‐tailed catfish (Hemibagrus wyckioides)

“…In addition, previous studies showed that dietary supplementation with taurine (Hu et al, ; Li, Lai, Li, Gong, & Wang, ), cholesterol (Deng, Kang, Tao, Rong, & Zhang, ; Twibell & Wilson, ) and hydroxyproline (Aksnes, Mundheim, Toppe, & Albrektsen, ; Wei et al, ) obviously improved the growth performance and immune response of fish fed plant protein‐based diets. Thus, the deficiency of taurine, cholesterol and hydroxyproline in SBM may be other reasons for the depressed immunity and growth of H. wyckioides fed high inclusion of SBM.…”

Effects of dietary vitamin C on growth, antioxidant activity, and immunity in ricefield eel (Monopterus albus)

“…Basic feed (crude protein: 42%, lipid: 6%) was formulated according to previous research in our laboratory, and the feed content is shown in Table (Hu et al, ; Ma et al, ). The main protein souces were defatted soybean meal and Peruvian steam fishmeal; the lipid source was menhaden fish oil; and the carbohydrate source was α‐starch, which also functioned as a binder.…”

“…Ricefield eel, Monopterus albus is an economic species that is commonly cage‐raised in central and southern China because of its delicious taste and commercial importance (Hu et al, ). However, M. albus is a kind of scale‐less fish with poor resistance to stress during the feeding process in floating cages and is easily susceptible to disease or even death.…”

Roles of dietary taurine in fish nutrition

“…Satriyo et al (2017) suggested that a minimum level of 0.45% of taurine is required in the diet with washed fishmeal as a main protein source to normalize the physiological conditions of juvenile totoaba, namely green liver, low gallbladder-somatic index (GBSI), low plasma total cholesterol, low lipid digestibility, low erythrocyte turnover and low visceral fat content. With most of the cases utilizing more content than the optimal level, dietary taurine has no or negative effects on fish (Hu et al 2018b;Stuart et al 2018;Zheng et al 2016). So, the current knowledge about the optimum dietary taurine levels is highly important for aquaculture as well as for future research.…”