Effects of dietary lipid sources on growth performance, fatty acid composition and hepatic lipid metabolism of juvenile blunt snout bream, Megalobrama amblycephala. (19th June 2018) - Zhang, Wuxiao
Abstract: This study investigated the effects of dietary lipid sources on juvenile blunt snout bream, Megalobrama amblycephala . Juvenile blunt snout bream (14.40 ± 0.01 g) were fed diets containing 75 g/kg of fish oil (FO), linseed oil (LO), soybean oil, coconut oil (CO), rapeseed oil or beef tallow (BT) for 9 weeks. Survival rates, final weight, weight gain, feed efficiency ratio and feed intake remained unchanged. Viscerosomatic ratio, hepatosomatic index and condition factor were highest in fish fed the CO diet ( p < 0.05). Whole‐body lipid content decreased, whereas liver lipid content increased in fish fed CO and BT diets ( p < 0.05). Eicosapentaenoic acid and docosahexaenoic acid in the muscle and liver increased in fish fed the FO and LO diets ( p < 0.05). FO and LO diets increased plasma glucose ( p < 0.05). Feeding CO diet increased hepatic fatty acid synthase (FAS) and acetyl‐CoA carboxylase expression, and FAS activity ( p < 0.05). Both CO and BT diets increased hepatic carnitine palmitoyltransferase I (CPT I) and carnitine palmitoyltransferase II expression, and CPT I activity compared to the FO diet ( p < 0.05). These results indicate that LO can be substituted for FO in juvenile blunt snout bream diets without negative effects.