Open AccessEffects of different dietary lipids on growth, body composition and lipid metabolism‐related enzymes and genes in juvenile largemouth bass, Micropterus salmoides
Author(s) -
Zhang Wei,
Tan Beiping,
Liu Kang,
Dong Xiaohui,
Yang Qihui,
Chi Shuyan,
Liu Hongyu,
Zhang Shuang,
Wang Hualang
Publication year - 2019
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12952
Subject(s) - biology , micropterus , bass (fish) , fish oil , fatty acid synthase , composition (language) , juvenile , zoology , carnitine , lipid metabolism , biochemistry , food science , endocrinology , fishery , fish <actinopterygii> , ecology , linguistics , philosophy
This study investigates the effects of different lipids on growth, body composition and lipid metabolism of largemouth sea bass fish Micropterus salmoides . A total of 360 juvenile M. salmoides (mean ± SD mass = 33.83 ± 0.15 g) were randomly stocked into 12 tanks of 0.5 m 3 volume for 8 weeks. Four replicates were made in each group, which were fed one of three diets containing fish oil (FO), soybean oil (SO) or lard oil (LO). The weight gain rate and specific growth rate did not differ among the groups ( p > 0.05). Fish oil fish had the lowest condition factor ( p < 0.05) and highest serum glucose content ( p < 0.05). Crude lipid contents in the whole body and in the liver and muscle of FO fish were significantly lower than in the SO and LO groups ( p < 0.05). The fatty acid composition of whole‐body lipids was closely correlated with that of the diet. The carnitine palmitoyltransferase 1 (cpt1) activity in the FO group was significantly higher than those in the SO and LO groups ( p < 0.05). No significant differences in fatty acid synthase (fasn) activity were observed among the groups ( p > 0.05). The Cpt1 and fasn gene expression levels in the FO group were significantly higher than those of the SO and LO groups ( p < 0.05). The apolipoprotein B100 gene expression level was significantly higher in the SO group than in the FO group ( p < 0.05). Fatty acid‐binding protein 1 gene expression levels in the FO and SO groups were not different ( p > 0.05) but were both higher than that of the LO group ( p < 0.05). The delta‐6 fatty acyl desaturase gene expression level in the LO group was significantly higher than that in the FO group ( p < 0.05), but lower than that in the SO group ( p < 0.05). It can be concluded that FO can be completely replaced by SO or LO in the M. salmoides diet, at least within the 8‐week culture period. Different types of dietary lipids significantly affect body condition and hepatic lipid metabolism in M. salmoides .