Dietary lipid level and source affect metabolic responses in hybrid catfish (Pseudoplatystoma reticulatum × Leiarius marmoratus)

Abstract

This study was undertaken to evaluate the effect of dietary lipid source [linseed oil (LO, rich in 18:3 n−3); corn oil (CO, rich in 18:2 n−6); olive oil (OO, rich in 18:1n−9); and fish oil (FO, rich in LC‐PUFA)] and level (9% L and 18% L) on growth, body composition and selected plasma biochemistry parameters in hybrid catfish (Pseudoplatystoma reticulatum × Leiarius marmoratus) juveniles. Moreover, liver histology (lipids, glycogen, cell vacuolization) and key metabolic enzyme activities were also evaluated. After 8 weeks of feeding, there were no differences in growth performance and whole‐body composition between groups. Plasma lipoprotein, muscle and liver composition, and G6PD and ME activity were affected by lipid level and source. No differences were observed between groups in hepatic ALT activity; however, AST activity was lower in fish fed the 9% L diets. Overall, liver and muscle fatty acid composition reflected that of diet FA composition, with increased n3/n6 ratio, high HUFA and low MUFA in fish fed FO compared with the VO diets. Higher liver glycogen content was observed in fish fed the 18% L than the 9% L diets, except for fish fed FO diet. Considering the experimental diets used, these results indicate that hybrid catfish can efficiently utilize VO supplementation as an energy source, without affecting growth performance and fillet composition.

Growth performance, nucleic acids, leptin and adiponectin and their receptor gene expression were significantly affected by feeding different lipid supplementation in GIFT tilapia juveniles

“…Lipid is essential nutrient for fish growth and development, which plays an important role in nutrition and physiology (Paulino et al., 2020; Xu et al., 2017, 2018). On the one hand, lipid acts as a form of energy storage and provides the body with metabolic energy to conserve dietary protein and limit ammonia production (Guo et al., 2019; Jiang et al., 2015; Wang, et al., 2018).…”

Nile tilapia fed insect meal: Growth and innate immune response in different times under lipopolysaccharide challenge

“…According to Barroso et al., (2014) Z. morio has higher ratios of omega 6, saturated and monounsaturated fatty acids, as registered in the fatty acid analysis in the diets of our study. Further, it has been reported that fatty acid imbalance of n‐3/n‐6 could lead to lipid deposition of fish (Mu et al., 2018; Paulino et al., 2020). However, it is possible to modify the insect fatty acids profile manipulating the rearing substrate as reported by several authors (Belforti et al., 2016; Gasco et al., 2018; St‐Hilaire et al., 2007).…”

Dietary Lipid Supplementation Could Significantly Affect the Growth, Fatty Acid Profiles, and Expression of PPARα, Leptin, and Adiponectin Genes in Juvenile Genetically Improved Farmed Tilapia

“…The fatty acid composition of the fish reflected dietary fatty acid composition. [ 31 ] On the other hand, n‐3 and n‐6 fatty acids share the same desaturatase, elongation enzyme, acetyltransferase, cycloxygenase, and lipoxygenase to produce eicosanoic acid series in fish. There is a metabolic competition inhibition between n‐3 and n‐6 fatty acids, and above enzymes have higher affinity for n‐3 PUFAs.…”