Influence of Dietary Dinamune® on Growth Performance and Lysozyme Activity in Rainbow Trout (Oncorhynchus mykiss) Fry

Abstract

This study was conducted to evaluate the effect of a commercial β-glucan based immunostimulant preparation, Dinamune®, in the form of a feed supplement, on the growth performance and lysozyme activity of rainbow trout fry (Oncorhynchus mykiss) weighing 1 g. Fish were fed diets containing 0 (control), 0.5, 1 and 1.5 g Dinamune® kg-1 of dry diet for a period of 11 weeks. Body weight was generally increased in fish which were fed diets supplemented with concentrations (1.5 Dinamune®/kg feed) (23.75 ± 7.48), compared with the control (21.38 ± 7.04) (p < 0.05). Specific growth rate was significantly (p < 0.05) the highest in 1.5 g Dinamune® kg-1 of dry diet (4.27 ± 0.40) and the lowest in the control group (4.13 ± 0.41). FCR value was found to be the best in the 1g kg-1 group (0.67 ± 0.17), followed by the 1.5g kg-1 group (0.73 ± 0.23), the 0.5 g kg-1 group (0.80 ± 0.36) and the control group (1.00 ± 0.25). Hepatosomatic index (HSI) showed a significant decrease in 1.5 g Dinamune® kg-1 of dry diet (0.88 ± 0.18), compared with the control (1.15 ± 0.19). Condition factor (CF) in the control, 0.5 g kg-1 diet, 1 g kg-1 diet and 1.5 g kg-1 diet was (1.30 ± 0.16, 1.34 ± 0.15, 1.19 ± 0.10 and 1.18 ± 0.10) respectively. Lysozyme activity of the liver, kidney, and serum were significantly stimulated in the 0.5, 1 and 1.5 g Dinamune® supplemented groups at the end of experiment, compared with the control (p < 0.05). doi:10.14456/WJST.2014.77

Keywords

• Dinamune
• immunostimulant
• rainbow trout
• Lysozyme