Reproduction and seasonal behaviour of the Norway lobster, Nephrops norvegicus in the Central North Sea
Redant, F. (1987). Reproduction and seasonal behaviour of the Norway lobster, Nephrops norvegicus in the Central North Sea. CM Documents - ICES, C.M. 1987(K:32). International Council for the Exploration of the Sea: Copenhagen. 12 + figures pp.
Part of: ICES CM Documents - ICES. ICES: Copenhagen. ISSN 1015-4744
The landings per unit effort of the Nephrops fishery show a clear seasonal pattern, attributed to the seasonal behavior of male and female Nephrops in general and to the typical behavior of the berried females, which hide most efficiently in their burrows throughout the egg bearing period. The data on the sex ratios of the Nephrops landings are discussed in relation to the reproductive cycle and the seasonal behavior of both male and female Nephrops. During winter time, when most of the females are berried and therefore less accessible to trawling than the males, more than 80 ppt. of the landings are composed of males. During summer time, when the females are as accessible to trawling as the males, the proportion of females in the landings may increase to more than 60%, depending on the size of the Nephrops in question.
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