Masculinization of Gynogenetic Northern Pike Juveniles Using 17 α‐Methyltestosterone

Gynogenetic juveniles of northern pike Esox lucius were fed a dry diet supplemented with 17 α‐methyltestosterone (MT) to reverse their phenotypic sex (i.e., masculinization). Successful sex reversal required that the fish (total length, 26–30 mm; wet weight, 0.14–0.19 g) be reared for 2 weeks at 22....

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Published in:North American journal of aquaculture 2003-07, Vol.65 (3), p.255-259
Main Authors: Luczynski, Marek J., Demska‐Zakes, Krystyna, Dabrowski, Konrad, Luczynski, Miroslaw
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Language:English
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Esox lucius
Freshwater
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description Gynogenetic juveniles of northern pike Esox lucius were fed a dry diet supplemented with 17 α‐methyltestosterone (MT) to reverse their phenotypic sex (i.e., masculinization). Successful sex reversal required that the fish (total length, 26–30 mm; wet weight, 0.14–0.19 g) be reared for 2 weeks at 22.0°C while being fed a diet supplemented with 20 or 30 mg MT/kg. The procedure resulted in the transformation of 77% and 87% of the gynogenetic fingerlings into functional males. Histological examination showed that the gonads and sperm ducts of all of the sex‐reversed males were normally developed.
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subjects Esox lucius
Freshwater
title Masculinization of Gynogenetic Northern Pike Juveniles Using 17 α‐Methyltestosterone
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