A 60 days feeding trial was conducted to illustrate the effect of graded levels of protein on the growth and metabolic enzymes of grey mullet (Mugil cephalus L.) fingerlings reared in inland saline water (ISW). Six isoenergetic (16 MJ/kg) and isolipidic (60 g/kg) diets containing 240, 260, 280, 300, 320 and 340 g crude protein (CP)/kg diet were formulated and fed to triplicate. Weight gain %, specific growth rate, protein utilizing efficiency, feed efficiency and RNA:DNA ratio were significantly higher (p .05) variations were observed for lactate dehydrogenase, oxidative stress enzymes, blood parameters and serum osmolality among all the treatment groups, but red blood cell count increases with increasing dietary CP levels. Based on the results, feeding dietary protein level of 300 g CP/kg is economically viable for rearing of grey mullet in ISW.

中文翻译：

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日粮蛋白质对内陆咸水养殖鲻鱼幼鱼生长性能、养分利用、消化酶和生理状态的影响

进行了 60 天的饲养试验，以说明蛋白质分级水平对在内陆咸水 (ISW) 中养殖的鲻鱼 (Mugil cephalus L.) 鱼种的生长和代谢酶的影响。配制含有 240、260、280、300、320 和 340 g 粗蛋白 (CP)/kg 日粮的六种等能 (16 MJ/kg) 和等脂 (60 g/kg) 日粮，并重复饲喂三次。在所有治疗组中观察到乳酸脱氢酶、氧化应激酶、血液参数和血清渗透压的增重百分比、特定生长率、蛋白质利用效率、饲料效率和 RNA:DNA 比率显着更高 (p = .05)，但红细胞计数随着膳食 CP 水平的增加而增加。根据结果​​，饲喂 300 g CP/kg 的日粮蛋白质水平对于在 ISW 养殖鲻鱼在经济上是可行的。