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Error Line: 0 FRESHWATER CRAYFISH: Variation in sex ratio in the nobel crayfish <i>Astacus astacus</i>: a reflection of yearly activity changes
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Freshwater Crayfish 7(1): 115-120 (1988)

PEER REVIEWED    RESEARCH ARTICLE

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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  e-mail link

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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