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Evaluating potential ecological and human health risks of exposure to bioaccumulative trace elements is typically implemented using analysis of tissue samples. Increasingly, the microchemistry of fish calcified structures is used to elucidate the lifetime exposure to trace elements. In the present study we measured total Hg (THg), methylmercury (MeHg) and selenium (Se) in muscle tissue and otolith samples from 12 species of fish collected at reference sites and sites influenced by power plant wastewater. Muscle tissue concentrations of Se were sensitive to recent wastewater exposure magnitude, stream type, trophic level, and species (P < 0.001). For Hg, concentrations in tissue and otoliths were affected only by trophic level and species. Levels of THg and Se, in muscle and otolith samples,were positively correlated for those species with a robust sample size. Some individual fish from three species (channel catfish, hybrid striped bass, freshwater drum) showed significantly increasing or decreasing lifetime concentrations of either THg or Se in otolith samples. Multiple regression analysis indicated that, for bluegill, muscle Se concentrations could be best explained using water concentrations of Se, sulfate, and molybdenum (r = 0.87; P < 0.001). Due to the increased cost and specialized sample processing requirements of analyzing trace elements in otolith structures, it may be prudent to limit these analyses to those species where insights into temporal trends are sought or where evidence indicates that fish move into, or out of, contaminated water bodies. This article is protected by copyright. All rights reserved.
This article was published in the following journal.
Name: Environmental toxicology and chemistry
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Diseases of freshwater, marine, hatchery or aquarium fish. This term includes diseases of both teleosts (true fish) and elasmobranchs (sharks, rays and skates).
A diverse genus of minute freshwater CRUSTACEA, of the suborder CLADOCERA. They are a major food source for both young and adult freshwater fish.
A selenium compound used as a source of SELENIUM, especially for patients that develop selenium deficiency following prolonged PARENTERAL NUTRITION.
Unstable isotopes of selenium that decay or disintegrate emitting radiation. Se atoms with atomic weights 70-73, 75, 79, 81, and 83-85 are radioactive selenium isotopes.
An order of fish comprising salmons, trouts, whitefish, graylings, and other families. They are both marine and freshwater fish, found in all oceans and are quite numerous in the Northern Hemisphere. (From Nelson: Fishes of the World)
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