Effects of dietary protein and lipid levels on growth, body composition and flesh quality of juvenile topmouth culter,Culter alburnusBasilewsky

Abstract

Nine experimental diets at three protein (35%, 40% and 45% crude protein) and lipid (5%, 8% and 11% crude lipid) levels with variable digestible protein to digestible energy (DP/DE) ratios ranged from 21.9 to 27.8 g protein MJ−1 were fed to topmouth culter (Culter alburnus Basilewsky) fingerlings (initial weight 6.5 ± 0.9 g) in triplicated groups (30 fish per replicated) for a period of 10 week to assess the optimum dietary DP/DE ratio and the protein sparing effect by utilizing dietary lipid. 27 cages of 1.5 m3 capacity placed in a lake located in Wuhan were used for rearing the fish. At the end of the experiment, maximum weight gain and thermal‐unit growth coefficient was found in fish fed diet D4 with 45% protein, 8% lipid and P/E ratio of 26.2 g protein MJ−1, but without a significant difference compared to fish fed diet D5 with 40% protein, 8% lipid and DP/DE ratio of 25.3 g protein MJ−1. The best flesh quality evaluated by muscle collagen content was found in fish fed D5. High fat accumulation with increasing dietary lipid levels was observed in whole body but not in muscle tissue. Hence, it may be concluded that the optimum formulation for maximum growth and quality of topmouth culter is a diet containing 40% protein and 8% lipid with a resultant DP/DE ratio of 25.3 g protein MJ−1. In addition, the protein sparing effect by inclusion lipid was observed but limited.

Effects of dietary protein levels on the growth, body composition, serum biochemistry and digestive enzyme activity in Chinese rice field eel ( Monopterus albus ) fingerlings

“…Furthermore, the optimum dietary protein requirement for maximum growth was 39.08% of the dry‐matter basis (Figure ). This result was similar to the protein requirement of the tropical bagrid catfish Horabagrus brachysoma (39.1%) (Giri, Sahoo, Paul, Mohanty, & Sahu, ) and Mystus nemurus (40%) (Ng, Soon, & Hashim, ), and juvenile Culter alburnus (40%) (Zhang et al, ). However, the protein requirement assessed in this study was smaller than those previously reported in M. albus juveniles, whose protein/lipid ratio were 420/55 g/kg (body weight of 37.83–39.75 g) (Chen et al, ) and 450/40 g/kg (body weight of 65.76 ± 1.07 g) (Ma et al, ) respectively.…”

Effects of dietary protein at two lipid levels on growth, gonadal development, body composition and liver metabolic enzymes of brown trout (Salmo trutta fario) broodstock

“…The gonadal development in fish is closely associated with the ecological conditions. In fish, when the dietary protein and lipid requirements are not fulfilled, it can lead to metabolic disorder (Zhang et al., ). In the present study, the dietary protein and lipid levels did not affect the female GSI significantly ( p > 0.05).…”

Dietary Lipid Levels Affect the Growth Performance, Lipid Deposition, and Antioxidative Capacity of Juvenile Scaleless Carp, Gymnocypris przewalskii, on the Qinghai‐Tibetan Plateau

“…The reactive oxygen species (ROS) generated by lipid peroxidation can result in damage to tissues and cellular integrity, and MDA is a main marker of oxidative damage induced by ROS (Rueda‐Jasso et al ; Zhang et al ). In the present study, fish fed high lipid diets (L8.5 and L10) had the highest MDA contents in hepatopancreas and intestine of G. przewalskii .…”