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1. The differential susceptibility of eggs, developing embryos, fry and adult of a cypridont fish, Oryzias latipes, have been studied on the base of the 24 hour Median Tolerance Limit to the organic mercury compounds, phenylmercuric acetate and metoxyethylmercuric chloride. 2. The aliphatic organic mercury, metoxyethylmercuric chloride was less toxic than the aromatic organic mercury, phenylmercuric acetate. To metoxyethylmercuric chloride, 24 hour TLm for eggs, fry and adult was 0.50-1.30 ppm, 1.48 ppm and 1.74 ppm respectively, while to phenylmercuric acetate, 0.18-0.26 ppm, 0.03 ppm and 0.21 ppm respectively. 3. To all toxicants applied adult fish were more tolerant than fry, but eggs in the solution of PMA were most resistant. 4. In developing embryos, 24 hour TLm to the organic mercury compounds gradually increased through the early stage, passed through a maximum in the median phase, at 5-day-old, and finally fell off in the later phase, in a general minimum. 5. With the process of growth of fish, 24 hour TLm increased logarithmically. A straight line is well fitted when log TLm (Y in ppm) is plotted against age (X in days) of the fish. The regression equation was, log Y=0.0050X-1.4018and significant in the level of P=0.01 and regression coefficient ranged from 0.0016 to 0.0084.

Acute Toxicity of Two Organic Mercury Compounds to the Teleost, Oryzias latipes, in Different Stages of Development