Bacterial nutrition of great scallop larvae |
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| Authors: | J Moal J F Samain S Corre J L Nicolas A Glynn |
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| Institution: | (1) IFREMER, Centre de Brest, BP 70, 29280 Plouzané, France;(2) Micromer, Zone industrielle du Vernis, 29200 Brest, France |
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| Abstract: | Bacterial nutrition of great scallop, Pecten moximus, larvae was investigated using the radioactive tracer technique. The bacterial labelling was studied initially to obtain a high and stable specific radioactivity (14C) of bacterial cells. A higher bacterial specific 14C activity was obtained when the tracer (amino acid) was introduced in the culture medium at the beginning of the exponential growth phase. After a 12 h labelling period in a rich nutritive medium, the bacteria were depurated in seawater for 5 h (chase) to prevent further 14C excretion and then added to larval rearing vessels. The larval labelling was followed for 12 h and then larvae were placed in new vessels without radioactive bacteria. The depuration of larvae was followed for 3 days. Data obtained on ingestion and assimilation efficiency show that bivalve larvae are able to ingest and digest bacteria. |
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| Keywords: | Bacteria Nutrition Great scallop (Pecten maximus) Larvae Tracer technique |
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