Effect of 17α-methyl testosterone, tamoxifen, and letrozole on growth performance and sex reversal of rainbow trout (Oncorhynchus mykiss)

Authors

Artemia and Aquaculture Research Institute, Urmia University, Urmia, Iran.

Abstract

Sex reversal and producing a monosex population is one of the most preferred growth promotion techniques of rainbow trout culture. Thus, the effects of 17α-methyltestosterone (2 mg/kg), tamoxifen (2, 20, and 100 mg/kg), letrozole (2, 20, and 100 mg/kg), and a combination of tamoxifen (100 mg/kg) and letrozole (100 mg/kg) on growth, masculinization and serum steroid content of rainbow trout were investigated in this research. Ethanol-dissolved chemicals were sprayed on commercial trout diet, and ethanol was evaporated overnight. The fish were fed the treated diet for two months and afterward, they were fed a commercial diet for six months. Results showed that 17α-methyltestosterone reversed the sex of rainbow trout effectively. The proportion of males, intersex, and females in this group were 76.67%, 10%, and 13.33%, respectively. In contrast with 17α-methyltestosterone, using tamoxifen and letrozole showed no effect on sex reversal of rainbow trout. Growth performance was adversely affected by all chemical-treated diets. However, compensatory growth occurred during first month after ending treatment period.

Keywords

Iranian Journal of Fisheries Sciences
Volume 22, Issue 3
May 2023
Pages 701-712

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