17β-Estradiol Can Induce Sex Reversal in Brown Trout

Hormones have been used to change phenotypic sex in many fish species. However, information specific changing brown trout Salmo trutta is lacking. This study compared the effectiveness of two different 17β-estradiol (estradiol) concentrations (20 mg/kg and 30 mg/kg) fed for 60 days, beginning at initial feeding. At 456 days post-initial feeding, 20 treatment groups were 84% 86% female, respectively. These values significantly higher than 47% females observed control group which did not receive dietary estradiol. end 60-day estradiol period, weight gain, percent feed conversion ratio all lower tanks receiving tanks. Individual also weighed less shorter estradiol-coated feed. Mortality ranged from 1.0 2.4% among treatments was different. After 105 treatments. individual longer heavier treatment, similar other first document successful reversal using While this lead complete feminization, 85-to-15% female-to-male indicates feminization genetic males. The levels are suitable step potentially develop a YY male broodstock invasive populations.