Induction of sex reversal in common carp (Cyprinus carpio) by oral administration of 17-a-methyl testosterone hormone in industrial stage.
In this study the masculinizing effect of 17-a-methyl testosterone in common carp was investigated.
Alcohol dry method was used for mixing hormone into food.
Treated fishes were fed with feed containing 17-a-methyl testosterone at a concentration of 300 mg/kg diet.
The treatment started at 10 days after hatching and duration of treatment was 45 days. The water temperature was 25±1. A control group was fed with normal diet without hormone and at the same situation.
After treatment the fishes were cultured for 270 days in the warm waterfish pond’s for differentiation of gonads.
At the end of culture period, random samples were taken and studied histologically, results statically reviewed. Histological study shown that in treated fishes the sexual rate was changed (P<0.005) and results obtained: 61.6% male, 26.7% strill and 11.6% intersex in treated fishes whereas control group obtained 51% female and 49% male.
Mean weight and mean length of treated fishes respectively were 135.9±23.8 grams, 19.5±3.2cm whereas control group were 110.4±11.37 grams, 18.8±1.2cm.
According to the results of this study administration of 17-a-methyl testosterone successfully induced sex reversal and sterility in common carp and females were discarded in this method.