摘要
The dietary protein requirement of juvenile turbot(initial average weight, 38.2 g ± 0.1 g) reared indoor in aerated aquaria was determined in this study. Five energy equal experimental diets were formulated with fish meal as protein source, which contained different concentrations of protein(47.2%, 51.0%, 54.6%, 59.3% and 63.6% of dry diet). Three groups of fish with 18 individuals in each, were cultured in 300-L tanks and fed twice a day for 8 weeks. During culture, temperature was controlled between 15.0 and 18.0℃, salinity was controlled between 28.5 and 32.0, acidity was controlled between p H7.8 and p H8.5, and ammonia nitrogen was maintained below 0.03 mg L-1 and dissolved oxygen was maintained about 7 mg L-1. Results showed that the growth of fish was significantly affected by dietary protein content(P < 0.05). Specific growth rate(SGR) of turbot increased when dietary protein content varied between 47.2% and 51.0%(P < 0.05), and then kept stable when dietary protein content was higher than 51.0%. Fish which were fed the diet containing 63.6% protein showed the highest SGR while those fed the diet containing 59.3% protein showed the highest feed efficiency rate. No significant difference of feed intake and protein efficiency ratio was found among experimental diets(P > 0.05). Broken-line regression analysis of SGR showed that the optimal dietary protein requirement of turbot was about 57.0%.
The dietary protein requirement of juvenile turbot （initial average weight, 38.2 g±0.1 g） reared indoor in aerated aquaria was determined in this study. Five energy equal experimental diets were formulated with fish meal as protein source, which con- tained different concentrations of protein （47.2%, 51.0%, 54.6%, 59.3% and 63.6% of dry diet）. Three groups of fish with 18 indi- viduals in each, were cultured in 300-L tanks and fed twice a day for 8 weeks. During culture, temperature was controlled between 15.0 and 18.0℃, salinity was controlled between 28.5 and 32.0, acidity was controlled between pH7.8 and pH8.5, and ammonia ni- trogen was maintained below 0.03 mgL-1 and dissolved oxygen was maintained about 7mgL-1. Results showed that the growth of fish was significantly affected by dietary protein content （P〈 0.05）. Specific growth rate （SGR） of turbot increased when dietary pro- tein content varied between 47.2% and 51.0% （P〈0.05）, and then kept stable when dietary protein content was higher than 51.0%. Fish which were fed the diet containing 63.6% protein showed the highest SGR while those fed the diet containing 59.3% protein showed the highest feed efficiency rate. No significant difference of feed intake and protein efficiency ratio was found among ex- perimental diets （P 〉 0.05）. Broken-line regression analysis of SGR showed that the optimal dietary protein requirement of turbot was about 57.0%.
基金
supported by the earmarked fund for Modern Agro-Industry Technology Research System with Grant No. CARS 50-G-08
