A study on dietary l-lysine requirement of juvenile yellow catfish Pelteobagrus fulvidraco

Abstract

An 8-week feeding trial was conducted to determine lysine requirement of juvenile yellow catfish (Pelteobagrus fulvidraco) by feeding formulated diets containing crystalline L L-lysine.Six isonitrogenous and isoenergetic diets (405 g kg )1 protein, 18 kJ g )1 gloss energy) containing fish meal together with soybean protein concentrate as protein sources and fish oil together with soybean oil as lipid sources were formulated. Crystalline L L-lysine was added into the six diets to acquire lysine concentrations of 17. 3, 21.8, 26.0, 31.3, 35.5 and 41.9 g kg )1 dry diets, respectively. Mixture of crystalline amino acid was supplemented to simulate the amino acid profile in muscle of yellow catfish. The results indicated that final body weight (FBW), weight gain (WG), specific growth rate (SGR), feed efficiency (FE) and protein efficiency (PE) increased with the increase in dietary lysine level from 17.3 to 31.3 g kg )1 of diet and then decreased as the dietary lysine levels further increased. No significant difference in survival rate was found among all the dietary treatments. One-slope, quadratic broken-line analysis on the basis of SGR showed that the dietary L L-lysine requirement of juvenile yellow catfish was 33.1 g kg )1 of dry diet (83.2 g kg )1 of dietary protein).

Effects of dietary L‐lysine supplementation on growth, body composition and muscle‐growth‐related gene expression with an estimation of lysine requirement of GIFT tilapia

“…In the present study, the whole‐body composition of GIFT tilapia was not affected ( p > .05) by dietary lysine supplementation. This result corresponds well to the different studies of Cao et al (), Khan () and Li, Zhou, Mo, Pan, and Gan (), where dietary lysine supplementation had no significant ( p > .05) differences in the whole‐body composition in yellow catfish, stinging catfish and juvenile grass carp, respectively. In general, it is considered that the whole‐body amino acid profiles do not change in fish under different treatments and even between species.…”

“…Moreover, it plays an important role in the synthesis of carnitine, which is important for the transport of long‐chain fatty acids into the mitochondrion for energy generation. In addition, dietary supplementation of lysine improves feed utilization (Li et al, ), nitrogen retention (Cao et al, ) and also reduce body lipid content of fish (Burtle & Liu, ; Nguyen, Rønnestad, Buttle, Lai, & Espe, ).…”

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“…In the current study significant enhancements in plasma total protein level was observed at increased isoleucine levels. There is no available study on the effect of dietary isoleucine on fish plasma total protein level, but in agreement to our study significant enhancements in fish serum/plasma protein levels have been reported following administration of optimum dietary lysine level in black sea bream (Sparus macrocephalus) (Zhou et al, 2010) and yellow catfish (Pelteobagrus fulvidraco) (Cao et al, 2012), and optimal dietary valine level in red sea bream (Rahimnejad and Lee, 2013). In general, ALT and AST are mainly distributed in the liver and spleen and play important roles in protein metabolism.…”

Dietary lysine requirement of juvenile dusky kob, Argyrosomus japonicus

“…Broken‐line “segmented” analysis of SGR indicates that juvenile dusky kob require dietary lysine of 31.7 g/kg dry diet to maximize growth performance. The dietary requirement of 31.7 g/kg dry diet equates to 73.5 g/kg dietary protein, which was lower than the reported value for black sea bream Sparus macrocephalus , 87.1 g/kg dietary protein (Zhou, Shao, Xu, Ma, & Xu, ) and yellow catfish Pelteobagrus fulvidraco , 83.2 g/kg dietary protein (Cao et al., ). This value is higher than the values reported for other commonly cultured fishes (Wilson, ).…”