Effects of Different Diets on the Growth Performance, Gonad Development and Body Composition at First Sexual Maturity of Rainbow Trout (Oncorhynchus mykiss)

Authors : Devrim MEMİŞ

Pages : 315-322

View : 24 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Rainbow trout Oncorhynchus mykiss with an initial mean weight of 174 g insert ignore into journalissuearticles values(1+ year old); were fed on 3 different commercial diets insert ignore into journalissuearticles values(1 extruded pellet and 2 steam pellet); in the same environmental conditions until their first spawning. Changes in growth performance insert ignore into journalissuearticles values(weight gain, condition factor, specific growth rate and feed conversion rate);, gonadosomatic index insert ignore into journalissuearticles values(GSI);, hepatosomatic index insert ignore into journalissuearticles values(HSI); and body composition insert ignore into journalissuearticles values(protein, lipid, ash and dry matter); were investigated. The mean weight gain and condition factor for fish fed the extruded diet was significantly greater than for those fed the steam pellet diets insert ignore into journalissuearticles values(P < 0.05 );. There were no significant differences in specific growth rate, mean length increments and feed conversion rate among the groups, although the feed conversion rate for the extruded diet was slightly lower than the others. The HSI of the group fed an extruded diet was significantly greater than those of the others insert ignore into journalissuearticles values( P < 0.05 );. The GSI values of female and male fish at the end of the study insert ignore into journalissuearticles values(October); did not differ significantly among the groups. Similarly, diet had no significant effects on the muscle composition of the trial fish, except that the muscle lipid of the group fed the extruded diet was significantly higher than those of the other groups insert ignore into journalissuearticles values(P < 0.05);.
Keywords : Broodstock, rainbow trout, growth, gonad development, diets, muscle composition