Data/hora: 01/06/2024 18:51:53

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
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