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Gilbert St-Pierre, Visual determination of sex in live Pacific halibut, ICES Journal of Marine Science, Volume 49, Issue 3, August 1992, Pages 373–376, https://doi.org/10.1093/icesjms/49.3.373
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Abstract
A procedure to determine the sex of live Pacific halibut is fast, accurate and consists of visually examining the shape of the genital vent. The procedure was tested on 1708 live halibut with an accuracy rate of 98% The procedure is effective for halibut 52 cm or longer but unsuitable for halibut under that length because the bulk of the genital vent is inadequate to evaluate with the naked eye. This procedure aids in population assessment and is valuable in establishing the sex of tagged fish and brood stock in halibut rearing programmes
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