Abstract
Exposure to a sublethal concentration of 35 ppm chromium induced pronounced increases in the population of circulating erythrocytes, hematocrit, clotting time, and hepatosomatic index at 90 hr post-treatment in a freshwater teleost, Colisa fasciatus. Leukopenia due to reduction in the number of small lymphocytes, thrombocytopenia, and a significant increase in the erythrocyte sedimentation rate were also noted in fish subjected to exposure to the metal; hemoglobin and the number of circulating immature erythrocytes and large lymphocytes were not affected. The data suggest that hematology can serve as an economical model for the study of toxic effects caused by chromium.
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