Reproduction traits of rainbow trout (Oncorhynchus mykiss) and effects of two different commerical feeds on the growth of fry

In this study, 11 female and 11 male rainbow trout broodstock were used. A total of 48.776 fertilized eggs were determined. Incubation period of eggs were 36 days with 93.37% hatching yield. After absorption of yolk sac, the fry were fed with A and B brand name commercial feeds for 90 days. At the end of feding period, condition factors and tissue indexes of A and B groups were determined as 0.96±0.03, 0.99±0.02 and 8.68±0.21; 9.24±0,33 respectively. There were no significant differences (p>0.05) between the groups with respect to condition factors and tissue indexes. Growth parameters such as specific growth rate, protein efficiency ratio and feed conversion ratio from A and B feeds were deterermined as 2.76±0,04, 2.59±0,09; 1.85±0,09, 1.59±0,11 and 0.99±0,05, 1.15±0,08 respectively. There were no significant differences between gropus considering all of these parameters (p>0.05). After a 90 day of feeding, mean live weights of the groups fed with A and B feeds were increased from 0.83 g to 9.87±0,28 g and from 0.83 g to 8.93±0,28 g respectively. Hepatosomatic indexes of A and B were calculated as 1.03±0,05 and 0.78±0,04 respectively. There were no significant differences between A and B groups with respect to live weight increases and hepatosomatic indexes (p>0.05). Mean weighted proportional growth of A and B groups were calculated as 215,46±7,96; 196,79±7,96 respectively. The difference between groups were statistically significant (p<0,05)