Data/hora: 14/06/2024 21:20:59

Provedor de dados: 	5	
País: 	France	
Título: 	Alimentation expérimentale de l'huître Crassostrea gigas à l'aide de navicules bleus Haslea ostrearia (Simonsen) de différentes tailles	
Autores: 	Barille, Laurent; Bougrier, Serge; Geairon, Philippe; Robert, Jean-michel.	
Data: 	1994	
Ano: 	1994	
Palavras-chave: 	Taille des particules; Qualité alimentaire; Haslea ostrearia; Crassostrea gigas; Alimentation; Particle size; Food quality; Haslea ostrearia; Crassostrea gigas; Feeding.	
Resumo: 	The influence on the feeding physiology (clearance, filtration, ingestion, absorption) of the Japanese oyster Crassostrea gigas of low concentrations of suspended particulate matter (SPM ranging from 2 to 20 mg.l-l) and high food quality (mean organic fraction =54 %) was studied in the laboratory. Experimental diets were made up with three strains of the "blue diatom" Haslea ostrearia, which is responsible of the greening of oyster-ponds. The strains were characterized by different sizes (48, 65 and 98 µm respectively) but possessed the same density and biochemical composition. Clearance rate was found constant at 2.2 1.h(-l).g-l dry weight and therefore was not influenced by increasing seston load. Pseudofaeces production was observed for SPM concentration adjusted at 2.1 and 2.3 mg.l-l, which suggests a decrease of the threshold of pseudofaeces production for diets having a high food quality. The effect of particle size on particle selection during pseudofaeces production was not demonstrated. Digestibility fluctuated from 60 to 90 %, but no differences between the three sizes were recorded. Total ingestion rate, which was regulated by pseudofaeces production, levelled off at 6.51 mg.h(-l).g-1• Organic ingestion and organic faeces production models suggest that physiological processes in the Japanese oyster lead to a constant organic absorption estimated at 1.22 mg.h-l.g-l in this study.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/1994/publication-3070.pdf	
Editor: 	Gauthier-villars/editions Elsevier	
Relação: 	http://archimer.ifremer.fr/doc/00000/3070/	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 1994 , Vol. 17 , N. 2 , P. 201-210	
Fonte: 	Ifremer / IRD/ CNRS