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Reproductive pattern of the clams, Ruditapes decussatus and R. philippinarum on intertidal flats in Brittany

Published online by Cambridge University Press:  11 May 2009

F. Laruelle ,
J. Guillou  and
Y.M. Paulet
F. Laruelle
Affiliation:
Faculté des Sciences et Techniques, Université de Bretagne Occidentale, URA 1513, France
J. Guillou
Affiliation:
Laboratoire d'Océanographie Biologique et
Y.M. Paulet
Affiliation:
Laboratoire de Biologie Marine, 6 Avenue Le Gorgeu, BP 452, 29275 Brest Cedex, France.
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Abstract

Since the introduction of the Manila clam Ruditapes philippinarum (Mollusca: Bivalvia) to aquaculture clam beds, this species has spread to several sites. As a result, an extensive fishery has developed around this species. Its reproductive cycle and that of a native clam species, Ruditapes decussatus (Mollusca: Bivalvia) from two Brittany sites are examined here and the seasonal variations in the condition index, the scale of maturation stages, the histology and the oocyte size-frequencies of both species are compared. The differences observed between the species and between sites were attributed to environmental conditions. Ruditapes philippinarum showed a more extended breeding period and a greater number of spawning events than R. decussatus. In the Morbihan Gulf, the reproductive activity of R. philippinarum appeared particularly great in terms of number of spawning events, and speed of maturation. For both species, synchronism was more apparent during the first maturation, while spawning, and particularly partial spawning, tended to decrease the level of synchronization.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 74 , Issue 2 , May 1994 , pp. 351 - 366
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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