Abstract
The initial ingestion age and size and the digestive index of Argopecten ventricosus-circularis Sowerby II, 1842 veliger larvae were investigated using epifluorescence microscopy. Ten microalgae were tested as feed during the first 7 days of life at this stage. Results of ingestion experiments showed there was a significant positive correlation between the smaller geometric dimension of the algae and the larval age and size of initial ingestion. Out of the 10 species offered, only Nannochloris oculata (NANO), Isochrysis galbana (TISO), Monochrysis lutheri (MONO), Chaetoceros muelleri (CM), Chaetoceros calcitrans (CC), Thalassiosira pseudonana clone 3H (3H), and Phaeodactylum tricornutum (PHT) were ingested. No ingestion was observed in Thalassiosira pseudonana clone s78 (S78), Tetraselmis suecica (TETRA) and Dunaliella tertiolecta (DUN) during the experiment. The digestion index of the larvae, defined as the degree of algal digestion at the third hour after ingestion, increased with larval age and size with TISO and MONO. With CC, 3H and CM, the digestion index was lower and no digestion was observed with NANO and PHT.
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