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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Bibliographic Details
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
Format: Article
Language:English
Subjects:
Esox lucius
Freshwater
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Summary: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.
ISSN:1522-2055
1548-8454
DOI:10.1577/C01-051