L'ostréiculture en baie de Bourgneuf. Relation entre la croissance des huîtres Crassostrea gigas et le milieu naturel : synthèse de 1986 a 1995

TL;DRAbstract

The oyster growth has been studied for a 10 year period, from 1986 to 1995, in four locations of the bay of Bourgneuf (French Atlantic Coast). The relations between oysters growth and the main molluscs stocks (cultivated oysters and wild mussels) or environmental factors (hydrobiology, currents, climatology) are analysed to understand the functioning of this shellfish ecosystem. As the water renewal time is about two months, primary production is essentially autochtonal. Phytoplankton development is controlled by the nutrients brought by the river Loire. An important part of the microalgac is composed by the microphytobenthos resuspended by west wind. High seston concentrations, measured on the North of the bay (150 mg/1 as an average), have a negative influence on the feeding physiology of die oyster. The important food development of this area (20 ug/1 of chlorophyll a) cannot be fully exploited. The decrease of the oyster growth rate,observed since 1980, on the whole bay, is due to

Chat with Paper

AI Agents for this Paper