Effect of two levels of dietary lipid on growth, body composition and some of plasma biochemical parameters in Rainbow trout (Oncorhynchus Mykiss) during starvation and refeeding

Mirzaei, Raheleh; Babaei, Sedigheh; Abedian Kenari, Abdolmohammad

Effect of two levels of dietary lipid on growth, body composition and some of plasma biochemical parameters in Rainbow trout (Oncorhynchus Mykiss) during starvation and refeeding

Authors

Raheleh Mirzaei ¹

Sedigheh Babaei ²

Abdolmohammad Abedian Kenari ³

¹ M.Sc. graduated. Fisheries Department, Khazar institute of higher education, Mahmoodabad, Mazandaran, iran.

² Ph.D. graduated, Dept. Aquaculture, Faculty of Marin Sciences, Tarbiat Modares University, Noor, Iran.

³ Professor, Dept. of Aquaculture, Faculty of Marin Sciences, Tarbiat Modares University, Noor, Iran. Email: aabedian@modares.ac.ir

Abstract

The effect of dietary composition and starvation on growth and plasma metabolites in rainbow trout of 14 g average initial weight was investigated. A group of 240 trout juveniles were distributed in 12 of 150 L tanks. The experiment was performed in a 2*2 factorial design with 2 lipid levels (10 and 18%) and 2 feeding conditions (feeding and starvation) with 4 treatments each with 3 replicates. The fish were fed on diet 1 (lipid 10%, carbohydrate 29%) and diet 2 (lipid 18%, carbohydrate 19%) with the same protein level (47%) and energy. The juveniles were fed to apparent satiation for 3 weeks, followed by starving for 2 weeks and then refed for 3 weeks. The biometery and plasma biochemical parameters were analysed in the day of 21 (end of 3 weeks feeding), 35 (after 2 weeks starvation) and 60 (end of 3 weeks refeeding). Based on the result, the best growth performance in the fish occurred in diet with 10% lipid in control group (feeding group) and no compensatory growth occurred in this treatmennt after 2 weeks starvation. Moreover, the result of body composition showed the starvation and diet composition had more effect on body lipid than body protein and body lipid content decreased by starvation. The starvation and diet composition did not have any significant effect on cholesterol and triglyceride, but they induced decreasing plasma glucose level in the trout.

Keywords

Starvation and refeeding

Rainbow trout

Growth

Lipid