Studies on the nutrition of the large yellow croaker, Pseudosciaena crocea R. I: growth response to graded levels of dietary protein and lipid

Abstract

The suitable protein‐to‐lipid ratio for juvenile large yellow croaker, Pseudosciaena crocea Richardson (initial body weight, 0.57 ± 0.11 g) was determined using practical diets in a 4 × 3 factorial experiment. Four dietary protein levels (34%, 37%, 42% and 47%) and three dietary lipid levels (7.5%, 10.5% and 14.0%) were tested. Each of the 12 diets was fed to triplicate groups of croaker juveniles for 60 days in floating netcages (1.0 × 1.0 × 2.0 m3) in the sea. The effects of dietary treatments on survival, weight gain, feed conversion ratio, protein efficiency ratio, hepatosomatic index and carcass composition of the fish were evaluated. At all three lipid levels, the best growth was always obtained in the fish fed diets of 47% protein. At 34% protein, better growth was observed for the fish fed the diet with 10.5% lipid, whereas at the protein levels above 37% the diets containing 10.5% and/or 14.0% lipid proved better. Based on the results of current experiment, the dietary protein:lipid ratio of 47:10.5 appeared to be suitable for this fish. Feed conversion ratio ranged from 1.40 to 1.98, declining with the increases of both dietary protein and lipid. The carcass lipid was correlated positively to dietary lipid, unlike the carcass protein that was independent of dietary protein. There was no interaction between dietary protein and lipid except for carcass lipid. Further investigations should be conducted to determine the optimal protein‐to‐lipid ratio for large yellow croaker juveniles using diets containing higher levels of protein and lipid than 47% and 14%, respectively.

Effects of dietary lipid levels on growth, feed utilization, body composition, fatty acid profiles and antioxidant parameters of juvenile chu’s croaker Nibea coibor

“…1). The result is within the range determined for other sciaenids, such as large yellow croaker Pseudosciaena crocea (10.5-14.0 %; Duan et al 2001) and cuneate drum Nibea miichthioides (9.4-16.2 %; Wang et al 2006). This may be attributable to the similar nutrition requirements of the test fish (family Sciaenidae and genus Nibea) in these studies.…”

“…Moreover, dietary lipids act as carriers of nutrients such as the fatsoluble vitamins, and function as precursors of eicosanoids, hormones and enzyme cofactors for fish (Watanabe 1982;Higgs and Dong 2000;Zhao et al 2015). Excessive dietary lipid also leads to increasing accumulation of lipid in body as well as decrease in growth performance and feed utilization (Duan et al 2001;Segato et al 2005;Wang et al 2006). Plus, protein sparing effects induced by the increase in dietary lipids have been documented in many fish species (Torstensen et al 2001;Chatzifotis et al 2010;Karalazos et al 2011), which was beneficial for growth performance and maximized the nitrogen retention (Cho and Kaushik 1990).…”

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

“…The results are in line with those from Duan et al (2001), who studied the yellow croaker (Polyactis crocea). However, it is well known that the variation of protein content in feed can directly influence the performance and body composition of fish (Furuya et al, 2000, 2005Silva, 2007).…”

Effects of fish protein hydrolysate on growth performance and humoral immune response in large yellow croaker (Pseudosciaena crocea R.)

“…With high nutritive value and better flavor, it is popularly consumed by people in Zhejiang Province, China. Due to excessive harvest, the wild large yellow croaker has nearly been depleted prior to the 1980s, and been widely cultured in China since the success of artificial hatchery (Duan et al, 2001;Mai et al, 2006). The purpose of the present study was to evaluate the effects of dietary supplementation with FPH on growth performance and humoral immune response in the large yellow croaker.…”