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Effects of dietary levels of protein on growth, feed utilization and physiological parameters for juvenile Dabry's sturgeon, Acipenser dabryanus
Author(s) -
Li Qingfei,
Lu Xuebao,
Liang Haiou,
Ai Qinghui,
Mai Kangsen
Publication year - 2018
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13656
Subject(s) - biology , sturgeon , juvenile , dietary protein , lysozyme , glycogen , protein efficiency ratio , feed conversion ratio , zoology , food science , fish <actinopterygii> , endocrinology , body weight , biochemistry , fishery , ecology
Five semi‐purified diets were formulated to contain graded levels of dietary protein (340, 390, 440, 490 and 540 g/kg diet), and each diet was assigned to triplicate groups of eight juvenile Dabry's sturgeon for 50 days. Results showed that specific growth rate increased linearly with increasing dietary protein levels from 340 to 440 g/kg diet, then levelled off at higher protein levels. Higher dietary protein (440 and 540 g/kg) significantly increased the feed intake and feed efficiency ratio of fish compared to lower protein diets (340 to 490 g/kg diet) ( p < .05). Fish fed a 440 g protein kg −1 diet had higher protein efficiency ratio and serum lysozyme activity than other treatments. Serum ammonia content and activities of liver aminotransferase were positively correlated with dietary protein levels. No significant difference ( p > .05) among groups was observed in glycogen content. As dietary protein level increased, protein and ash content of fish dorsal muscle were greatly enhanced, whereas lipid content was significantly reduced ( p < .05). Based on broken‐line regression analysis of SGR against dietary protein levels, the optimum dietary protein level for maximal growth of juvenile Dabry's sturgeon is 446.68 g/kg diet.