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Food Filterjng Process of Daphnia Carinata King to Assess the Water Soluble Detergent

Soelaksono Sastodihardjo & Hilda Zulkifli

Abstract. Water organisms such as zooplankton and fish were used quite often as indicators for water quality in connection with chemically toxic substance in water. Several criteria could be use such as LC50, population index, and physiological phenomena. Bioassay that rely on this physiological phenomena was meant to measure the sublethal effect of the suspected toxic substance on the organisms. Further development of sublethal bioassay using filtering rate of Daphnia carinata (Cooley, 1977; McMahon, 1966) has taken place for a certain detergent. Yeasts cells tagged with 32P were used as food for Daphnia carinata and the filtering rate was measured from the radioactivity of these crustaceans after a certain period of feeding time. Comparison was made between the feeding rate in the medium with and without the detergent and they appeared to be different.


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