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Freshwater Crayfish 6(1): 182-186 (1986)


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Growth, maturity, and fecundity of Astacus astacus in lake Steinsfjorden, S.E. Norway

Skurdal J and Qvenild T  e-mail link

Published Online: 1/21/2020


In the mesotrophic Lake Steinsfjorden the growth curve for the crayfish population was linear within the observed size range. The mean length increment per molt was 9.0 mm for males and 7.8 mm for females. Two mol­ting periods were observed each year in males and immature females, while mature females only molted once. The density of crayfish declined by 38% between 1981 and 1983 due to heavy exploitation. During this period, the proportion of mature females in­creased from 6.5% to 46.8%, while their size at maturity decreased from 78 to 70 mm. The mean size of pleopod eggs was 2.83 mm. Larger females carried significantly more eggs than smaller females. The numbers of pleo­pod egg were 55-65% of the ovarian egg number.

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Skurdal J and Qvenild T. (1986). Growth, maturity, and fecundity of Astacus astacus in lake Steinsfjorden, SE Norway. Freshwater Crayfish 6(1):182-186. doi: 10.5869/fc.1986.v6.182



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   Published Online: 1/21/2020

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