Conjugated linoleic acid affects growth performance, hepatic fatty acid profile and lipid metabolism in juvenileSynechogobius hasta

Abstract

This study was conducted to determine the effect of dietary CLA (Conjugated linoleic acid) levels on growth performance, fatty acid profiles and lipid metabolism of liver in Synechogobius hasta. Fish were fed six diets with fish oil replaced by 0 (control), 5, 10, 15, 20 and 25 g kg−1 CLA for 8 weeks. Weight gain, WG, and SGR (specific growth rate) tended to increase when dietary CLA levels increased from 0 to 10 g kg−1 and then decline with further increasing dietary CLA levels to 25 g kg−1. FCR (feed conversion ratio) showed contrary trend with WG and SGR. The reduced VSI (vicero somatic index) and increased HSI (hepatosomatic index) were observed in fish fed increasing dietary CLA levels. Whole‐body lipid content declined, but hepatic lipid content increased with increasing dietary CLA levels. Dietary CLA modified total percentages of the main groups of fatty acids in liver. Hepatic 6PGD, ME and ICDH activities increased with increasing dietary CLA levels. FAS and G6PD were very variable and not related to dietary treatments. CPT I activities showed no significant differences among the treatments. Based on second‐order polynomial regression analysis of WG and FCR against dietary CLA level, 8.7–10.1 g kg−1 was indicated to be the optimal dietary CLA range for maximum growth and feed utilization for S. hasta.

Effects of dietary conjugated linoleic acid on growth performance, tissue adipocytokine levels and lipid metabolism of grass carp

“…Dietary CLA inclusion in grass carp did not affect the whole-body composition. Similar results have been reported in hybrid striped bass (Morone saxatilis × M. chrysops) (Twibell et al, 2000), yellow perch (Perca flavescen) (Twibell et al, 2001), channel catfish (Ictalurus punctatus) (Twibell & Wilson, 2003), European sea bass (Dicentrarchus labrax) (Valente et al, 2007), yellow catfish (Pelteobagrus fulvidraco) (Tan et al, 2010) and javelin goby (Synechogobius hasta) (Tan, Luo, Zhao, Liu, & Liu, 2014).…”

EFFECT OF CONJUGATED LINOLEIC ACID FEEDING PERIODS ON FATTY ACID PROFILE AND NUTRITIONAL QUALITY OF <i>Astyanax altiparanae</i>

“…According to Martin et al (2000), the t10,c12 isomer could promote lipid oxidation as a result of the position of its double bonds. Higher incorporation of c9,t11 relative to t10,c12 was also observed for O. mykiss (Bandarra et al, 2006), P. fulvidraco (Tan et al, 2010), O. niloticus (Dos Santos et al, 2011), and Synechogobius hasta (Tan et al, 2014) fed increasing levels of CLA. Considering the observed reductions in the t10,c12/c9,t11 ratio as the duration of feeding increased, it can be inferred that it was caused by the difference between the incorporation rates of CLA isomers.…”