Difference between fresh- and sea-water fishes in the accumulation and effect of environmental chemical pollutants. II. Intakes of chlordane and pentachlorophenol by fresh-water-acclimated mullet (Mugil cephalus).

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Abstract
In order to confirm that the accumulation of environmental chemical pollutants may be different between fresh-and sea-water fishes, mullet (Mugil cephalus), an estaurine sea-water fish, was acclimated to fresh-water, to examine the intakes of chlordane and pentachlorophenol-Na (PCP-Na) and also the acute lethal toxicity of PCP-Na. The accumulation of chlordane in the liver of fresh-water-acclimated mullet was approximately four times higher than that of sea-water mullet. The accumulation of PCP in the liver was also higher in fresh-water mullet than in sea-water mullet. The LC50 of PCP-Na was about six times lower in fresh-water mullet than in sea-water mullet. These results well-coincided to the previously reported observation on an euryhaline fresh-water fish, tilapia (Tilapia nilotica). The difference thus found between fresh-and sea-water fishes suggests that chemicals are accumulated and metabolized differently in the fishes of both water areas. This difference might be an important factor for the ecological evaluation of chemical pollutants.

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