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- Title
EFFECTS OF NATURAL ORGANIC MATTER SOURCE ON REDUCING METAL TOXICITY TO RAINBOW TROUT (ONCORHYNCHUS MYKISS) AND ON METAL BINDING TO THEIR GILLS.
- Authors
Richards, Jeff G.; Curtis, P. Jeff; Burnison, B. Kent; Playle, Richard C.
- Abstract
Juvenile rainbow trout (Oncorhynchus mykiss, 3 g) were exposed for 74 h in ion-poor (soft) water to a mixed-metal solution in the presence of 4, 6, and 10 mg C/L natural organic matter (NOM). The metals were 0.2 µM Pb, 0.1 µM Hg, 0.1 µM Cd, 1.3 µM Cu, 0.05 µM Ag, and 3.5 µM Co, and the natural organic matter was isolated by reverse osmosis from three sources in southern Ontario, Canada. The six-metal solution alone was extremely toxic to the fish. Increasing concentrations of each NOM increased trout survival, but the NOM having the most allochthonous properties (from Luther Marsh) increased fish survival most, while the NOM having the most autochthonous properties (from Sanctuary Pond, Point Pelee) increased fish survival least. This pattern was reflected in the degree of reduction of Pb and Cu accumulation by the gills. Relatively simple chemical characterization of NOM, such as protein-to-carbohydrate ratios, or optical characterization, such as absorbance-to-fluorescence ratios (e.g., representing aromaticity), may adequately reflect these biologically relevant differences in organic matter quality.
- Subjects
RAINBOW trout; ONCORHYNCHUS; FISHES; AQUATIC animals; CADMIUM; COPPER
- Publication
Environmental Toxicology & Chemistry, 2001, Vol 20, Issue 6, p1159
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1897/1551-5028(2001)020<1159:EONOMS>2.0.CO;2