Cycles saisonniers, reproduction et qualite des ovocytes chez Pecten maximus en rade de Brest

This work is part of the program, "recruitment determinism in scallops" initiated in 1992 by the "Contrat de Baie". The aim of this research was to explain interannual abundance fluctuations observed for Pecten maximus, in the Bay of Brest. To this end an analytical approach to the life cycle of the species was undertaken to determine its critical phases. A phase may be considered as "critical" if the mortality rate at its level varies from one year to the other. Using data from 1989 to 1994, a precise time-table of the "physiological year" of the scallop in the Bay of Brest was determined. Fecundity and gamete production kinetics were estimated from the annual variation in the weight indices of the gonad. In the laboratory, egg quality was estimated following stimulated spawning of newly caught individuals. The digestive activity was estimated by amylase activity measurements during a three year period. Spawning lasts 6 months in the Bay of Brest from March to October. Spawning, muscle and digestive gland growths, are intimately linked to phytoplancton blooms. Gonad production shows a maximum in April-May, and two relative minima in Match and November. These results, which provide detailed understanding of the adult's annual cycle in the Bay of Brest, will be used to interpret the relationship between the annual cycle and larval and post larval abundance and survival. Already, these results are being used to improve spat production in hatcheries.

Auteurs du document :

Paulet, Yves-marie, Bekhadra, Farida, Devauchelle, Nicole, Donval, Anne, Dorange, Germaine

Obtenir le document :

Programme rade : 3è rencontres scientifiques internationales : actes de colloque, Brest les 14 - 15 et 16 mars 1995 au Quartz. Volume 2, Journée du 15 Mars 1995. pp.1-13

Mots clés :

Pecten maximus, recruitment, reproductive cycle, digestion

Thème (issu du Text Mining) :

MILIEU NATUREL

Date :

1995

Format :

text/xml

Langue :

Inconnu

Droits d'utilisation :

info:eu-repo/semantics/openAccess, restricted use