The effect of dietary methionine concentrations on growth performance of juvenile Nile tilapia (Oreochromis niloticus) fed diets with two different digestible energy levels

Abstract

A growth trial was conducted to examine the effect of dietary digestible energy (DE) content on methionine (Met) utilization and requirement in juvenile Nile tilapia (Oreochromis niloticus). Ten iso‐nitrogenous (288 g kg−1 protein) practical diets, with two DE levels (10.9 MJ kg−1; 12.4 MJ kg−1) and five methionine supplementation levels (0, 1, 2, 4 and 6 g kg−1), were hand‐fed twice daily to triplicate groups of Nile tilapia (initial body weight 8.95 ± 0.06 g) for 8 weeks. Weight gain (WG) and specific growth rate (SGR) increased significantly with increasing dietary methionine concentration at the same DE content (P < 0.001). At the same dietary methionine level, WG and SGR of fish fed high‐DE diets were significantly higher than that of fish fed low‐DE diets (P = 0.0001), although no interaction was found between dietary DE and methionine supplementation. Based on quadratic regression analysis between dietary methionine concentration and weight gain, optimal methionine requirement for maximum growth, expressed as g Met required kg−1 diet (low‐ versus high‐DE diets), increased as diet DE concentration increased (7.34 versus 9.90 g kg−1 diet, respectively; with cysteine 4.70 g kg−1 diet). The results indicated that diet DE content affects methionine utilization and requirement in juvenile Nile tilapia, fish fed high‐DE diets required more methionine for maximum growth.

Optimizing amino acid balance in fish meal‐free diets for GIFT strain of Nile tilapia ( Oreochromis niloticus ) by deletion method

“…He et al (2017) and Diogenes et al (2016) estimated the dietary methionine requirement of Nile tilapia at 9.9 g/kg of diet, which is close to the estimated value (9.2 g/kg) in the AA balanced diet. Similarly, Bomfim et al (2008) estimated the optimum dietary methionine requirement to be 9.1 g/kg of diet for optimum growth of Nile tilapia.…”

“…The Nile tilapia is cultured under diverse rearing conditions in many countries due to its high growth rate and yield. Through the years, numerous studies have been carried out to estimate essential amino acid (EAA) requirements of Nile tilapia to attain maximum growth rate and feed utilization (Nguyen et al, 2019; Zaminhan et al, 2017, 2018; Diogenes et al, 2016; Figueiredo‐Silva, Lemme, Sangsue, & Kiriratnikom, 2015; Gan et al, 2016; He et al, 2017; Michelato et al, 2016, 2017; Yue et al, 2014; Santiago & Lovell, 1988). Nile tilapia has been genetically improved over 15 generations of selection with 10% improvement in weight gain per generation (Eknath & Hulata, 2009).…”

Performance of Oreochromis niloticus in recirculating aquaculture systems at different levels of daily protein intake

“…The crude lipids in the carcasses were significantly different ( p < .05) at the final time between DPI 1.0 (presented a low level 8.7%) and the remaining treatments. High levels of ash (24.7%) and protein (60.6%) were obtained, even though the values of crude lipids for weeks 17 and 34 (DPI 1.4, DRI 1.2) were high compared with those determined by Michelato et al (), who found 6.7%–3.8% (chloroform: methanol extraction) in a tilapia culture with supplementation of methionine and taurine; levels of 5.7%–10.7% were found in 80.1–90.3 g fish that were supplemented with methionine (He et al, ). The high values in the carcasses could have been affected by the protein in the feed (40% protein during all culture times).…”

“…With all these results, we established a base for using the DPI metric to feed in high density RASs in warm climates and in cultures with temperatures above 30°C. Azim and Little, (2008) Michelato et al (2018), who found 6.7%-3.8% (chloroform: methanol extraction) in a tilapia culture with supplementation of methionine and taurine; levels of 5.7%-10.7% were found in 80.1-90.3 g fish that were supplemented with methionine (He et al, 2016). The high values in the carcasses could have been affected by the protein in the feed (40% protein during all culture times).…”

Methionine plus cystine requirements for the maintenance and efficiency of utilization with tambaqui of different body weights

“…The SGR values may vary depending on the experimental conditions of each study. For fast-growing fish like the Nile tilapia, the present SGR ranged from 2.27 to 5.56% day -1 (Figueiredo-Silva et al, 2015;He et al, 2017;He et al, 2020). Fast-growing species allocate a greater fraction of their amino acid requirements for body protein deposition, and consequently, have greater efficiency of utilization of amino acids (Helland;Hatlen;Grisdale-Helland, 2010;He et al, 2013;Hua;Suwendi;Bureau, 2019).…”