ABNORMAL ARSENIC ACCUMULATION BY FISH LIVING IN A NATURALLY ACIDIFIEDLAKE

The fish Tribolodon hakonensis live in good health in the naturally ac idified Lake Usoriko, located in Aomori Prefecture, Japan, which has b een acidified (pH 3.4-3.8) by sulfuric and hydrochloric acid of volcan ic origin, The contents of various metals in various tissues of T, hak onensis, from Lake Usoriko were examined extensively by ICP-AES and, i t was discovered that large amounts of arsenic were accumulated in the eye tissues, This might be partly related to the fact that the lake w ater contains relatively large amount of arsenic and little phosphorus .