http://worldcat.org/entity/work/id/34758427

External sex determination of lake trout (Salvelinus namaycush), white sucker (Catostomus commersoni) and lake whitefish (Coregonus clupeaformis) in the experimental lakes area, northwestern Ontario

Characteristics of the anal and urogenital openings were used to successfully determine the sex of female and male lake trout (Salvelinus namaycush), white sucker (Catostomus commersoni) and lake whitefish (Coregonus clupeaformis) from June to October 1981, at the Experimental Lakes Area, northwestern Ontario. Fish were sexed using a) external morphological features, and b) extracting sexual products with a syringe. Dissections were used to confirm external sex determination. The success rate for the procedure was 92% (lake trout), 81% (white sucker), and 92% (lake whitefish). The sexing syringe did not always produce reproductive materials but was used successfully to test elasticity of the urogenital opening and penetrability of the urogenital tract. Distention or retraction of the anal and/or urogenital pores, formation of a genital papilla, coloration and accessibility of the urogenital pore were the most successful characteristics used in externally sexing the fish.

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