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National Repository of Grey Literature

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Modifications of fish fins into intromittent organs Kubická, Lucie ; Černý, Robert (advisor) ; Kratochvíl, Lukáš (referee) Detailed record

Proximate control of sexual dimorphism in livebearer Poecilia wingei Farkačová, Klára ; Kratochvíl, Lukáš (advisor) ; Slavík, Ondřej (referee) The effect of 17α-methyltestosterone a 17β-estradiol on sex of livebearer fish Poecilia reticulata and P. wingei was studied. Solution of 2.5 mg testosterone was added in the aquarium the first and fifteenth day after delivery of new fry. Estrogen was administered in food to gravid females (400 mg per 1 kg food). Sex of all individuals was determined in one, two and three months. Administration of neither testosterone nor estrogen caused sex reversal; in the second case reproduction of almost all females was stopped. Detailed record

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