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Comparison of Arsenic Concentrations in Carcass and Viscera of Swim-up Rainbow Trout Exposed to Dietary and Waterborne Arsenic
Citation:
JENSON, C. T., R. J. ERICKSON, T. L. HIGHLAND, R. HOCKETT, D. HOFF, AND D. R. MOUNT. Comparison of Arsenic Concentrations in Carcass and Viscera of Swim-up Rainbow Trout Exposed to Dietary and Waterborne Arsenic. Presented at Midwest SETAC/NLSOT Meeting, Duluth, MN, March 31 - April 02, 2008.
Impact/Purpose:
This work is a part of a larger study on the effects of dietary arsenic on fish that will demonstrate whether this route of exposure needs more consideration in aquatic life risk assessments.
Description:
Rainbow trout fry were exposed to arsenic in water only, diet only, or both diet and water in 28-d studies evaluating survival and growth. Diets consisted of Lumbriculus variegatus that were exposed to multiple concentrations of waterborne arsenate for 7d and then fed to test fish in measured daily rations. When trout were exposed only to waterborne arsenate at 0.5 to 32 mg As/L, survival and growth were reduced at 16 and 32 mg As /L and growth was also reduced in one of two exposures at 8 mg/L. For diet-only exposures, rainbow trout growth was reduced when fed diets that had been exposed to 4 or 8 mg As/L. For combined exposures, contaminated diets did not result in increased mortality, but did result in greater reductions in growth, compared to the water-only exposures. To better understand the difference in effects among these exposures, arsenic concentrations in the viscera and the rest of the fish were analyzed for selected surviving fish. Differences in this internal distribution of arsenic due to exposure route and concentration will be presented and related to the magnitude of effects observed.