Effects of dietary protein and lipid levels on growth, feed utilization and body composition inPseudobagrus ussuriensisfingerlings

Abstract

An 8-week feeding trial was conducted to investigate the optimum dietary protein and lipid levels for growth, feed utilization and body composition of Pseudobagrus ussuriensis fingerlings (initial weight: 3.40 ± 0.01 g). Twelve diets containing four protein levels (350, 400, 450 and 500 g kg À1 crude protein) and three lipid levels (50, 100 and 150 g kg À1 crude lipid) were formulated. Fish were randomly allotted to 36 aquaria (1.0 9 0.5 9 0.8 m) with 25 fish to each glass aquarium. Fish were fed twice daily (08:00 and 16:00) to apparent satiation. The results showed that weight gain and specific growth rate (SGR) decreased with increasing dietary lipid level from 50 to 150 g kg À1 at the same dietary protein level. Fish fed the diets containing 150 g kg À1 lipid exhibited higher feed conversion ratio (P < 0.05), lower protein efficiency ratio (PER) and nitrogen retention efficiency (NRE) relative to fish fed the diet containing 50 and 100 g kg À1 lipid. Weight gain and SGR significantly increased with increasing dietary protein from 350 to 450 g kg À1 at the same dietary lipid level, and even a little decline in growth with the further increase in dietary protein to 500 g kg À1 . Daily feed intake, NRE and PER were significantly affected by both dietary protein and lipid levels (P < 0.05) and tended to decrease with increasing dietary protein and lipid levels. Whole-body protein content increased as protein levels increased and lipid levels decreased. Whole-body lipid and muscle lipid content increased with increasing dietary lipid level, and decreased with increasing dietary protein at each lipid level. There was no significant difference in condition factor and viscerosomatic index among fish fed the diets. Hepatosomatic index was affected by dietary lipid level (P < 0.05), and increased with increasing dietary lipid level at the same protein level. These results suggest that the diet containing 450 g kg À1 protein and 50 g kg À1 lipid with a P/E ratio of 29.1 mg protein kJ À1 is optimal for growth and feed utilization of P. ussuriensis fingerlings under the experimental conditions used in the study.

Effects of dietary protein and lipid levels on growth performance, feed utilization and body composition of juvenile hybrid grouper, Epinephelus fuscoguttatus×E. lanceolatus

“…However, in this study increasing dietary protein and lipid levels resulted in significant reduction of feed intake. This is in agreement with results of studies on channel catfish (Ictalurus punctatus) (Page and Andrews, 1973) and Pseudobagrus ussuriensis (Wang et al, 2013) where feed intake decreased with increasing protein and lipid levels. It has been generally suggested that fish like other animals, eat primarily to satisfy their energy requirements (Cho and Kaushik, 1985;Kaushik and Medale, 1994).…”

“…In the present study fish fed low-protein diets used dietary protein more efficiently, as higher PER values were recorded compared to those fed the high protein diets. Similar results have also been reported in other fish species (Deng et al, 2011;Mohseni et al, 2013;Wang et al, 2013). This could be explained by the existence of a compensatory mechanism enabling higher PER for fish fed low-protein diets (Berger and Halver, 1987;Catacutan et al, 2001).…”

Growth performance and body composition in response to dietary protein and lipid levels in Nile tilapia (Oreochromis niloticus Linnaeus, 1758) subjected to normal and temporally restricted feeding regimes

“…() and Wang et al. (), as well as an increased whole‐body lipid deposit, supporting the findings of Siddiqui and Khan () due to deamination and storage as body fat of excess dietary protein, accompanied by a reduction in whole‐body moisture and ash. It appears that the increases in whole‐body protein and lipid deposits were at the expense of moisture and ash deposits with the increase in dietary protein levels.…”

Identification of Sex-Specific Markers Reveals Male Heterogametic Sex Determination in Pseudobagrus ussuriensis

“…As the largest one of bagrid catfish species, it has been recently added into aquaculture in China because of its delicious meal and better production performance (Ou et al 2014;Wang et al 2013b). Field surveys and aquaculture practices have observed significant sexual dimorphism in growth rate and body size, in which males grow faster than females, and result in an ultimate threefold size difference.…”