Growth, feed utilization and body composition of juvenile golden pompanoTrachinotus ovatusfed at different dietary protein and lipid levels

Abstract

A feeding trial was conducted to determine the suitable dietary protein and lipid levels for juvenile golden pompano Trachinotus ovatus reared in net pens. Ten test diets were formulated at five levels of crude protein (330, 370, 410, 450 or 490 g kg À1 ) and two levels of crude lipid (65 or 125 g kg À1 ). Golden pompano fingerlings (initial body weight 4.7 g ind À1 ) were fed the test diets for 8 weeks. Weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR), nitrogen retention efficiency (NRE), energy retention efficiency (ERE), condition factor (CF), hepatosomatic index (HSI), body protein content and total nitrogen waste (TNW) were dependent on both dietary protein and lipid levels. Feed intake (FI) and viscersomatic index (VSI) were dependent on dietary protein level, while body lipid content was dependent on dietary lipid level. Weight gain increased with increasing the dietary protein level (at the same lipid level) but was lower at the dietary lipid level of 65 g kg À1 than at 125 g kg À1 (at the same protein level). Fish fed at the dietary protein levels of 460-490 g kg À1 had higher WG and lower FCR than at 330-410 g kg À1 . Energy retention efficiency tended to increase with increasing the dietary protein level from 330 to 410 g kg À1 , while no significant difference was found in nitrogen retention efficiency between the dietary protein levels (at the same lipid level). Results of this study suggest increasing the dietary lipid level from 65 to 125 g kg À1 could not induce protein-sparing action in golden pompano, and the suitable dietary protein and lipid levels for juvenile golden pompano reared in net pens should be 450-490 and 65 g kg À1 .

Evaluation of Protein Levels in Diets for Salema Porgy (<i>Sarpa salpa</i>) Juveniles, a New Candidate Species for the Mediterranean Aquaculture

“…Due, the increased carbohydrate levels in the present test diets with lower dietary protein might have stimulated the lower protein catabolism. It has been reported that HSI is positively correlated with dietary carbohydrate levels, while inversely related to dietary protein [22,24,68,69]. In the present study however, an adverse relation between HSI and carbohydrate level, but positive correlation with dietary protein levels were observed.…”

Replacement of Dietary Fish Meal with Poultry By‐product Meal and Soybean Meal for Golden Pompano, Trachinotus ovatus, Reared in Net Pens

“…Fish meal (white fish meal), SBM (solvent‐extracted), and other feed ingredients were purchased from Haihuang feed company (Hangzhou, China). The proximate composition of the feed ingredients was described in Wang et al (). The content of histamine and total volatile basic‐nitrogen (TVBN) of fish meal were 32.4 mg/kg and 39.9 mg N/(100 g), and the peroxide value (POV) was not detectable.…”

“…Diets S40 and S60 used in Trial II were the same diets used in Trial I. All the test diets were formulated to contain 48.0% crude protein and 6.5% crude lipid (Wang et al ). Crystalline l ‐Lys and dl ‐Met were added to avoid Lys or Met deficiency in the test diets.…”

“…Golden pompano, Trachinotus ovatus , is a candidate for aquaculture in brackish water and seawater (Tutman et al ). The suitable dietary protein and lipid levels for golden pompano are 46.0 and 6.5% (Wang et al ); however, the nutrient availability of various feed ingredients to golden pompano has not been determined. Poultry by‐product meal (PBM) and soybean meal (SBM) are widely used as protein sources in fish diets (NRC ).…”

Performance of juvenile mojarra supplied with feed containing varying levels of crude protein

“…In contrast to the worsening performance of fish observed from the 40 g. 100 g -1 level, results from which an optimal level of protein resulted in an improvement in weight gain, as observed by Sá and Fracalossi (2002) when working with piracanjuba (B. orbigyanus), by Fernandes, Carneiro and Sakamura (2001) in pacu juveniles (P. mesopotamicus), by Cotan, Lanna and Bomfim (2006) in two spot astyanax fingerlings (Astyanax bimaculatus) and by Wang (2013) …”