Abstract
Influence of red-clay turbidity on survival, growth, and distribution of larval lake herring, Coregonus artedii, was measured by holding larvae for 62 days at 9 levels of suspended solids varying from 0 to 48 FTU (1 to 28 ppm). Test concentrations included the normal turbidity range of the red-clay area in western Lake Superior. The bioassay was conducted in a continuous-flow system using chambers designed to elicit normal behavioral responses to turbidity and light. Growth and survival were not influenced at the range of concentrations studied. Larvae in the higher suspensions were distributed closer to the surface of the test chambers, a condition which may indirectly influence survival in Lake Superior.
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