Publication

2006-03

English

http://archimer.ifremer.fr/doc/2006/publication-1116.pdf (0.14 Mo)

2005 Elsevier B.V. All rights reserved

Soletchnik Patrick¹, Faury Nicole², Goulletquer Philippe²

1 : IFREMER, LERPC, F-17390 La Tremblade, France.
2 : IFREMER, LGP, F-17390 La Tremblade, France.

Aquaculture (0044-8486) (Elsevier), 2006-03 , Vol. 252 , N. 2-4 , P. 328-338

7

Aquaculture, Biology

Marennes Oleron bay, Glycogenolysis, In vivo, Glycogen incorporation, Maturation, Summer mortality, Crassostrea gigas

This paper investigates the biological responses of Crassostrea gigas under traditional culture conditions on a mudflat in Marennes-Oleron bay. Summer mortality has been regularly observed in recent years in oysters reared using "on bottom" culture conditions. The present study attempts to provide a better understanding of the mortality phenomenon through biological parameters. Classical 'field parameters' such as mortality and growth rates, and quality index (dry meat weight/ dry shell weight x 1000) were monitored. Additional parameters, as biochemical composition of oyster meat and glucose incorporation capacity, were included as potential new bioindicators. The work highlighted a critical timing (May-June) preceding the summer mortality and characterised by an arrest in lipid synthesis and a decrease in carbohydrate content. During this period, growth (especially gonad maturation) either slowed down significantly or even stopped. The first mortality event occurred during a growth renewal period at the end of June. Short-term analysis (15 days) provided information to identify such responses which may indicate a physiological stress and demonstrating the need for further investigation. The seasonal food availability (estimated from chlorophyll a levels) did not facilitate the mortality understanding which occurred after water temperature went above 18-19 T. Nevertheless, this study shows carbohydrate anabolism contributed in the physiological stress leading to mortality events.