000			01248am a2200193a 44500
092			_a04 _b
260			_c1996
300			_a215-223
650			_aPecten maximus
650			_avieira
650			_aBacteria
650			_aNutrition
650			_aGreat Scallop
650			_alarvae
650			_aTracer technique
520			_aBacterial 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.
942			_cBK
999			_c514 _d514