FN Archimer Export Format PT C TI Cycles saisonniers, reproduction et qualite des ovocytes chez Pecten maximus en rade de Brest OT Seasonal cycles, reproduction and oocyte quality in Pecten maximus BT AF PAULET, Yves-Marie BEKHADRA, Farida DEVAUCHELLE, Nicole DONVAL, Anne DORANGE, Germaine AS 1:1;2:1;3:2;4:1;5:3; FF 1:;2:;3:PDG-DS;4:;5:; C1 Laboratoire "Flux de Matière et Réponse du Vivant", URA CNRS 1513, UBO, 6 ave. Le Gorgeu, BP 809,29285 Brest cedex, France IFREMER centre de Brest, Laboratoire PMDC. BP 70, 29280 Plouzané, France Laboratoire "Cultures Cellulaires", UBO, 6 ave Le Gorgeu, BP 809, 29285 Brest cedex, France C2 UBO, FRANCE IFREMER, FRANCE UBO, FRANCE SI BREST SE PDG-DS UR https://archimer.ifremer.fr/doc/00044/15495/12861.pdf LA French DT Proceedings paper DE ;Pecten maximus;recruitment;reproductive cycle;digestion AB 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. PY 1995 CT 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 ID 15495 ER EF