Sex Determination of Yellow Perch by External Morphology

We developed a method of using external morphological characteristics to determine the sex of yellow perch Perca flavescens. The characteristics used were (1) the shape of the urogenital opening, (2) the shape of the anterior edge of the urogenital opening when thumb pressure was applied to the abdo...

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Bibliographic Details
Published in:North American journal of aquaculture 2011-07, Vol.73 (3), p.285-287
Main Authors: Malison, Jeffrey A., Held, James A., Kaatz, Sarah E.
Format: Article
Language:English
Subjects:
Perca flavescens
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Summary:We developed a method of using external morphological characteristics to determine the sex of yellow perch Perca flavescens. The characteristics used were (1) the shape of the urogenital opening, (2) the shape of the anterior edge of the urogenital opening when thumb pressure was applied to the abdomen just anterior to the anus, and (3) the presence or absence of swelling around the anus. In females, the urogenital opening was crescent or half‐moon shaped, its anterior edge remained linear when pressure was applied to the abdomen, and a ring‐shaped area of swelling was present around the anus. In males, the urogenital pore was circular, its anterior end distended to a V or U shape (pointed anteriorly) when the abdomen was pressed, and the area around the anus was not generally swollen. The accuracy of using this method was 97.4% for fish 190–280 mm total length, 93.1% for fish 111–150 mm, and 82.7% for fish 80–110 mm.
ISSN:1522-2055
1548-8454
DOI:10.1080/15222055.2011.601983