METAL ELEMENT CONTENTS IN COMMERCIAL FRESHWATER FISHES FROM LAKES OF DIFFERENT TROPHIC TYPES IN SUZHOU REGION

Contents of 26 metal elements were determined for the commercial fishes from takes in Suzhou region. The results are as follows: 1) Magnitudes of contents of metal elements are in the order: benthic fishesmid-waterfishesupper-layer fishes, Fishes at higher levels in the food chain have higher contents than those at lower levels (i.e. carnivorous fishes omnivorous fishesherbivorous fishes). Contents in fish gills are higher than in the flesh. 2) The contents of metal elements are relatively stable in fishes from the same environment. There is a regional distribution of metal contents in fishes from polluted lakes. 3) The contents of metal elements in the freshwater fishes from the lakes in Suzhou region are not very high and are comparable to those in fishes from the Caspian Sea, U.S.S.R. The magnitudes of metal contents in fishes from Suzhou region are in the order:FeZnSrCuPbBaLiNbGaNiCeTiMnThCoCrAsHgCdVZrYLaBe≥YbMo.