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Growth of the edible crab (Cancer pagurus L.) off south-west England

Published online by Cambridge University Press:  11 May 2009

D. B. Bennett
D. B. Bennett
Affiliation:
Fisheries Laboratory, Burnham-on-Crouch, Essex
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Extract

Moult increments, annual moult frequency and hence annual growth were determined from suture-tagged edible crabs (Cancer pagurus L.) released and recaptured off Devon, Cornwall, and Dorset.

The average moult increments of males and females at a premoult carapace width of 100 mm were similar; at larger sizes the average moult increment of females was considerably less than that of males. Annual moult frequency of C. pagurus in south-west England decreased with increase in size, females more so than males.

As a result of the smaller moult increments and lower moult frequency of females, their annual growth is considerably less than that of males. This appears to be the result of three aspects of sex and reproduction: (1) reduction in moult increments, probably as a result of competition for nutritive resources between egg production and body growth; (2) the interruption of the moulting cycle by successive annual spawnings from a single impregnation at the previous moult; and (3) accentuation of the larger increments in weight at moulting of male crabs due to the allometric growth of their chelae. A consequence of the higher growth rate of males is the presence of very large male crabs – a distinctive feature of the population structure of the stock off south-west England.

The growth of C. pagurus in south-west England was compared with published data for stocks off the east and north-east coast. Moult increments were similar for both areas, but there were considerable differences in the moult frequencies. In the south-west, males moult more frequently than females; the opposite is the case for the east and north-east crab stocks. A valid reason for this difference has not yet been established.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 54 , Issue 4 , November 1974 , pp. 803 - 823
Copyright
Copyright © Marine Biological Association of the United Kingdom 1974

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References

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