Retarded growth of Artemia salina by overfeeding.

The brine shrimp is one of the typical filter-feeding plankton, but as the shrimp was interfered with the growth in dense algal suspension, the Californian shrimp was reared with marine chlamy-domonad at 28°C to know the effect of algal density from that of ingestion speed. High ingestion rate was found to be responsible for the retarded growth. The filtering rate and ingestion rate was found to be responsible for the retarded trowth. The filtering rate and ingestion rate were measured during the growth experiment, and the regression equations to body length were obtained. The maximal daily ration was found to be enormously large; 3, 5 and 10mm shrimp could ingest about eight, three and one times of the bodiy nitrogen respectively. The critical food density was about tens of chlamydomonads per μl. The gross growth efficiency ranged about 20-25 per cent in terms of nitrogen.