Growth performance and whole-body composition of yellow catfish (Pelteobagrus fulvidracoRichardson) under feeding restriction

Abstract

Fish growth is an important index in aquaculture practice. However, the effect of growth under restricted feeding on quality of fish grown to the same size remains poorly unknown. In this study, yellow catfish were reared by feeding them at three different feeding rates such as low (FR‐L group), medium (FR‐M group) and high (apparent satiation) ration levels for 82, 58 and 34 days to reach the same size, respectively. After this period, the growth performance, whole‐body amino acid composition and fatty acid profile of the fish were evaluated. Feeding restriction led to significant decreases in specific growth rate and feed conversion efficiency. Significant increases in dry matter, protein and energy contents were observed in fish under both restricted feeding treatments. FR‐L‐treated fish had significantly lower whole‐body essential amino acid contents, and significantly higher Ala and non‐essential amino acid contents compared to fish fed to satiation. Fish in restricted feeding treatments had significantly higher n‐3 PUFA and n‐3/n‐6 ratio compared to the fish fed to satiation. The present results indicate that from a quality perspective, there are certain advantages in improvement of whole‐body composition and enrichment of n‐3 PUFA associated with the restricted feeding of yellow catfish at slow growth rate.

Feeding management strategies to optimize the use of suspended feed for Nile tilapia ( Oreochromis niloticus ) cultivated in bioflocs

“…Reduction in feeding rate promotes mobilization of body stores of glucose, lipids and amino acids (Shimeno, Shikata, Hosokawa, Masumoto, & Kheyyali, 1997). It is likely that fish uses lipids as a source of energy by reducing the amount of feed supplied (Dong et al, 2017). In fact, fish treated with lower feeding rate presented reduced ether extract in body composition, but no difference was observed in the protein retention among animals from different feeding rate treatments.…”

Effects of feeding rate and dietary protein levels on the breeding performance of female yellow catfish ( Pelteobagrus fulvidraco )

“…In rainbow trout (Oncorhynchus mykiss), feed restriction changed the fatty acid composition of the eggs including arachidonic acid (AA, C20:4n-6), α-linolenic acid (ALA, C18:3n-3) and eicosapentaenoic acid (EPA, C20:5n-3), which are linked to the better quality of eggs (Cardona et al, 2019). Yellow catfish treated with feeding restriction had significantly higher level of n-3 PUFA and n-3/n-6 ratio than the fish fed to satiation (Dong et al, 2017).…”

“…In rainbow trout ( Oncorhynchus mykiss ), feed restriction changed the fatty acid composition of the eggs including arachidonic acid (AA, C20:4n‐6), α‐linolenic acid (ALA, C18:3n‐3) and eicosapentaenoic acid (EPA, C20:5n‐3), which are linked to the better quality of eggs (Cardona et al, 2019). Yellow catfish treated with feeding restriction had significantly higher level of n‐3 PUFA and n‐3/n‐6 ratio than the fish fed to satiation (Dong et al, 2017). On the other hand, obesity injures the oocyte quality and female reproduction by disturbing hormone metabolism, the general body metabolism and the follicular development environment (Pantasri & Norman, 2014).…”

Supplementation of the commercial diet of Nile tilapia (Oreochromis niloticus) with DL-methionine and soybean oil under feed restriction

“…If this occurs, the cost of producing tilapia would be reduced, contributing to giving greater economic sustainability to the activity. According to Dong et al (2017), fish digest and assimilate dietary proteins and lipids better when under feed restriction. The use of lipids from bioflocs as a source of energy by fish can allow a reduction in the amount of feed offered to animals, without zootechnical damage.…”