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Research Article: Effect of 17α-methyl testosterone, tamoxifen, and letrozole on growth performance and sex reversal of rainbow trout (Oncorhynchus mykiss)
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A. Irani *   , F. Noori |
| Urmia University , a.irani@urmia.ac.ir |
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Abstract: (776 Views) |
| 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. |
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| Keywords: Masculinization, Rainbow trout, Sex reversal |
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Full-Text [PDF 381 kb]
(483 Downloads)
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Type of Study: Orginal research papers |
Subject:
aquaculture
Received: 2021/05/19 | Accepted: 2023/04/26 | Published: 2023/08/15
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