Effect of yellow clay on respiration and phytoplankton uptake of bivalves


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ABSTRACT:  Yellow clay dispersion has been applied to mitigate red tides in Korea since 1995. The present study documents the effect on physiology of two marine bivalves by examinations of clay uptake, respiration, and clearance rate (CR) of animals after the treatment of yellow clay. The amount of clay in gills and inside cavities of shellfish was increased with time, and the inside of the shellfish filled with clay in 2 h. The ejection of the accumulated clay was evident from as early as 30 min after removal from clay pools. Animals removed from the clay pool discharged all observable clay by 6 h. Within 30 min, CR decreased quickly and returned to the level of the untreated control groups within 2 h.