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Reproduction and growth of Sphaerechinus granularis (Echinodermata: Echinoidea) in southern Brittany

Published online by Cambridge University Press:  11 May 2009

Monique Guillou  and
Christine Michel
Monique Guillou
Affiliation:
URA CNRS D1513, Laboratoire d'Océanographie Biologique, Institut d'Etudes Marines, Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, F - 29275 Brest Cedex, France
Christine Michel
Affiliation:
URA CNRS D1513, Laboratoire d'Océanographie Biologique, Institut d'Etudes Marines, Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, F - 29275 Brest Cedex, France
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Extract

Although the English Channel is the northern limit of the latitudinal range of Sphaerechinus granularis (Echinodermata: Echinoidea), this echinoid can produce locally high densities in Brittany, such as in the Glénan Archipelago (Bay of Concarneau) where a small-scale fishery has been exploited since 1985. The reproductive cycle, the growth patterns and the migration of the species in this area were studied from 1988 to 1992. Sphaerechinus granularis presents an annual reproductive cycle with a major spawning in the early spring. But inter annual variability in the time when spawning starts can be observed. A relationship is established between the date of onset of spawning and the climatic conditions during the whole period of gonadal growth. Recruitment is isolated in time and reflects the reproductive cycle.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 73 , Issue 1 , February 1993 , pp. 179 - 192
Copyright
Copyright © Marine Biological Association of the United Kingdom 1993

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