Data/hora: 05/06/2024 05:39:51

Provedor de dados: | 5
País: | France
Título: | Mussel (Mytilus edulis) culture management along the Normandy coastline (France) : stock assessment and growth monitoring
Autores: | Goulletquer, Philippe; Joly, Jean-pierre; Le Gagneur, Eric; Ruelle, Francois.
Data: | 1994-09-22
Ano: | 1994
Palavras-chave: | Model; Growth monitoring; Stock assessment; Mytilus edulis; Blue mussel; Modèle; Suivi de croissance; Estimation de stocks; Mytilus edulis L.; Moule bleue.
Resumo: | The Normandy region is presently a leading shellfish rearing area in France yielding 35,000 metric tons of oysters C. gigas and Il,000 metric tons of mussels M. edulis on a yearly basis. Preliminary studies were initiated in 1989, 1991 and 1992 to develop the sampling strategy for cultured mussel stock assessment. Comprehensive mussel stock assessment and concomitant growth monitoring were carried out in 1993 to study mussel population and optimize overall s1l1ellfish culture management.  A three-stage cluster sampling strategy combined with stratification was tested on the 278 kms 'bouchot' type culture with a sampling effort of 275 units. Stratification was based upon two criteria including geographical sector and tidal level. Overall biomass was estimated to be 15,721 metric tons (1,069 t on the eastern coast o fCotentin) with a 27.7% precision level, representing a total 13,992 t net weight.  Concomitant oyster growth monitoring on 36 sites prompted us to study spatial variability and establish relationships to maximize the current spatial management.  An empirical model is proposed to link overall growth performance to local stocking density, tidal distribution and distance from the main runoffs inputs. It aims to provide recommendations in support of decision-making to improve shellfish culture. This approach is discussed in view of assumptions inherent in the model and used as a basis for further research programs.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/1994/acte-3073.pdf
Editor: | Counc. Meet. of the Int. Counc. for the Exploration of the Sea, St. John's (Canada), 22-30 Sep 1994
Relação: | http://archimer.ifremer.fr/doc/00000/3073/
Formato: | application/pdf