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Publication . Other literature type . Article . 1998

Nutrional inadequacy of Nannochloris atomus and Stichoccocucs bacillaris for the oyster Crassostre gigas (Thunberg) larvae

René Robert;
Open Access
English
Published: 01 Jan 1998
Publisher: Société Française de Malacologie
Country: France
Abstract
L'évaluation de Nannochloris atomllS et de Stichoccocus bacillaris comme algue fourrage pour des larves d'huîtres a été réalisée au cours du présent travail. Après une étude en milieu contrôlé de la croissance et de la distribution en taille de ces algues, ces deux espèces de phytoplancton ont servi d'aliment à des larves d'huître Crassostrea gigas. Malgré la petite taille du nanoplancton (2,5 à 20 µm3) le développement larvaire de l'huître est médiocre. L'étude de leur assimilation et dégradation en microscopie à épifluorescence montre que ces algues sont bien ingérées mais peu digérées par des larves de 2 et 6 jours. Leur pauvre valeur alimentaire peut donc être également reliée à leur faible digestibilité.
The evaluation of Nannochloris atomliS and StichoccocllS bacillaris as nutrient sources for oyster larvae has been attempted in the present work. After a study of their grawth and size distributions, these two species were used as food for Crassostrea gigas larvae. Despite praper sizes (2.5 to 20 µm3) the larval development of Crassostrea gigas was poor. Evaluation of ingestion and digestion of both algae, by means of epifluorescence microscopy, on 2 day and 6 day old larvae showed that they were normally ingested but weakly digested. Consequently, their nutritional inadequacy for larval molluscs may be also related to their indigestibility.
Subjects by Vocabulary

Medical Subject Headings: fungi animal structures

Subjects

Stichococcus bacillaris, Nannochloris atomus, Larvae, Nutrient sources, Huître, Crassostrea gigas, Nutrition, Larve, Algue fourrage

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