Effect of sex reversal in rainbow trout (Oncorhynchus mykiss Walbaum) using 17 alfa-methyltestosterone and 11 beta-hydroxyandrostenedione
2010
Kuzminski, H. | Dobosz, S.,Inland Fisheries Institute, Olsztyn (Poland). Dept. of Salmonid Research, Rutki
The effectiveness of sex reversal in mature female rainbow trout (Oncorhynchus mykiss) using 17 alfa-methyltestosterone (6 ppm-MT) and 11 beta-hydroxyandrostenedione (20 ppm-OHA) was compared. Hormones were administered with the first exogenous feed for up to 60 days. Among the fish treated with OHA, 95 percent females were reversed into mature neo-males and 1.6 percent to bisexual individuals. Among the fish treated with MT only, 59.7 percent females were reversed to neo-males and 1.8 percent to bisexual individuals. Functional neo-males were 1.6 percent and 5.3 percent, respectively. The rest of the neo-males had obstructed seminal vesicles in various stages. The gonadsomatic index was 3.9 percent at age 3+ in both groups of mature fish. The shape of the testes ranged from elongated to stunted. The bisexual fish had immature oocytes and mature testes with viable semen that was used for egg fertilization
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