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Variation in sex ratio in the nobel crayfish Astacus astacus: a reflection of yearly activity changes
Westin L and Gydemo R 
Published Online: 6/1/2020
Abstract
A natural population of the noble crayfish, Astacus astacus, was followed over four years. All crayfish along a defined stretch of shoreline were caught by light-trapping at monthly intervals during the ice-free season. The sex-ratio among juveniles was approximately 50-50 during the whole year except for June and July when males dominated. Juveniles made up about 30% of the total catch. Among adult crayfish, males dominated all months except JulyOctober, when females dominated. The results reflect the lifehistory of the crayfish. The frequency of adult females participating in reproduction was estimated and found to be low in the smallest size-group.
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Westin L and Gydemo R. (1988). Variation in sex ratio in the nobel crayfish Astacus astacus: a reflection of yearly activity changes. Freshwater Crayfish 7(1):115-120. doi: 10.5869/fc.1988.v7.115
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Published Online: 6/1/2020
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