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Effects of dietary lipid levels on growth performance, whole body composition and fatty acid composition of juvenile gibel carp ( Carassius auratus gibelio )
Author(s) -
Wang Aimin,
Yang Wenping,
Shen Yonglong,
Han Guangming,
Lv Fu,
Yu Yebing,
Huang Jintian,
Zhang Jiahong
Publication year - 2015
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.12571
Subject(s) - biology , juvenile , composition (language) , carp , docosahexaenoic acid , polyunsaturated fatty acid , zoology , weight gain , food science , fatty acid , biochemistry , endocrinology , body weight , fishery , ecology , fish <actinopterygii> , philosophy , linguistics
We evaluated the effects of dietary lipid levels on the growth, whole body composition and fatty acid composition of juvenile gibel carp ( Carassius auratus gibelio ). Triplicate groups of 120 juvenile Carassius auratus gibelio (average weight: 2.05 g) were fed four isonitrogenic diets formulated with lipid levels of 1.4% (low), 6.1% (control), 11.6% (medium) and 21.1% (high) for 60 days. Weight gain in the 11.6% lipid group was significantly higher than that in the other groups ( P < 0.05). The feed conversion ratio decreased and protein efficiency ratio increased ( P > 0.05) as dietary lipid levels increased. N‐3 polyunsaturated fatty acids ( PUFA ) were not detected in faeces. The whole body lipid contents of 11.6% and 21.1% lipid level groups were significantly higher than that of the 1.4% and 6.1% lipid level groups ( P < 0.05). The content of whole body n‐3 PUFA in the 21.1% lipid level group enhanced significantly ( P < 0.05). The whole body contents of eicosapntemacnioc acid ( EPA ) and docosahexaenoic acid ( DHA ) in the 21.1% lipid level group were the highest ( P < 0.05). These results indicated that high dietary lipid levels (21.1%) inhibit weight gain and promoted fat and n‐3 PUFA deposition in juvenile Carassius auratus gibelio , which led to liver damage. A dietary lipid level of 11.6% was determined to be optimal for growth performance of juvenile Carassius auratus gibelio .