Abstract
The toxicity of mercury to Himedaka Oryzias latipes was assessed in the range of 100-1000ppb in HgCl2 and 50-300ppb MeHgCl (methyl mercury) solutions in water tanks using the still water method. LC50 values obtained were 700ppb and 155ppb for HgCl2 and MeHgCl, respectively. After rearing for 48 h the amount of total mercury found in live fish was around 25 ppm regardless to the concentrations of HgCl2 solutions; the corresponding concentrations for dead fish were much higher, being 41-58 ppm. No evidence of conversion of HgCl2 to organic mercury was observed during the period. Excretion of accumulated mercury was relatively fast when the accumulated mercury was mainly HgCl2, but it was very slow when the accumulated mercury was mainly MeHgCl. When HgCl2-containing feed was given to Himedaka for 5 weeks, there was no sign of accumulation of mercury in the fish, but gradual accumulation was observed when MeHgCl-containing feed was given.
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