Abstract: The growth performances, biological traits and nutritional quality of muscle were studied in snakehead Channaargus with body weight of(136.62±5.34)g reared in an enclosure and fed fresh frozen trash fish(TF) and formulated diet (FF) at three stocking densities of 15 000, 30 000 and 45 000 ind./hm2 with triplication from the beginning of September 7, 2015 to the end of November 2, 2015 by biochemical method in order to provide reference to optimize feed formula and culture pattern. It was found that there were significantly higher weight growth rate and specific growth rate and significantly lower food conversion ratio in the fish fed FT than in the fish fed FF (P<0.05), without significant difference in survival rates of the fish fed different diets and without significant differences in weight growth rate and specific growth rate and food conversion ratio in different stocking density groups (P>0.05). The fish fed TF had significantly lower hepatosomatic index, viscerosomatic index and condition factor than the fish fed FF did at the same stocking density (P<0.05), without significant differences in different stocking density groups (P>0.05). There was no significant difference in contents of ash, crude fat, and crude protein containing 18 kinds of amino acids except for proline in different groups (P>0.05). The protein quality of the fish fed FF was superior to the fish fed TF by EAAI method, especially at low stocking density. Fatty acid analysis showed that the fish fed FF had significantly higher percentage of saturated fatty acids (SFA) in muscle than the fish fed TF did(P<0.05), with significantly higher percentage of nine polyunsaturated fatty acids (PUFA)such as EPA and DHA than the fish fed FF(P<0.05).It is recommended that formulated diet be optimized by reduction in dietary carbohydrates content and improvement of polyunsaturated fatty acid composition and content based on nutritional property of TF, in order to promote healthy snakehead farming.
原居林, 郭建林, 刘梅, 顾志敏. 不同饲料类型和放养密度对乌鳢生长特性及营养品质的影响[J]. 大连海洋大学学报, 2017, 32(5): 534-543.
YUAN Ju-lin, GUO Jian-lin, LIU Mei, GU Zhi-min. Comparison of growth performances and nutritional quality of muscle in snakehead Channa argus fed different diets at different stocking densities. Journal of Dalian Ocean University, 2017, 32(5): 534-543.
2017, Vol. 32 
