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Acute and sub-chronic toxicity of lead to the early life stages of smallmouth bass (Micropterus Dolomieui) |
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| Authors: | David J Coughlan Steven P Gloss Joe Kubota |
| Institution: | 1. Cooperative Fish and Wildlife Research Unit, USA 2. Department of Natural Resources, Cornell University, 14853, Ithaca, NY, USA 4. USDA Plant, Soil, and Nutrition Laboratory, Department of Agronomy, Cornell University, 14853, Ithaca, NY, USA |
| Abstract: | The early life stages of smallmouth bass (Micropterus dolomieui) were exposed to Pb in acute (96 hr) and sub-chronic (90 day) bioassays (water hardness = 152 mg L?1 as CaCO3). After 96-hr static exposures at nominal Pb concentrations up to 15.9 mg L?1, eggs and sac fry showed no increased mortality over that in controls. Swim-up fry (96-hr LC50 = 2.8 mg Pb L?1) were more sensitive to Pb exposure than were fingerlings (96-hr LC50 of 29.0 mg Pb L?1 ). The relation between dissolved Pb and mortality was non-significant for either swim-up fry or fingerlings. Fingerlings were exposed to Pb concentrations as high as 405 μg L?1 for 90 day to evaluate effects on substrate selection, locomotor activity, hematology, and weight. Dark or light substrate selection (cover-seeking) and locomotor activity, weight and hemoglobin concentration in the blood were not significantly altered by any treatment. Hematocrit and leucocrit varied significantly but not in relation to Pb levels. Sub-chronic Pb exposure did not appear to represent a threat to smallmouth bass in waters of medium hardness and above-neutral pH (7.1 to 7.9). |
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