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Distribution of mercury in the tissues of five species of freshwater fish from Lake Mead, USA

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Distribution of mercury in the tissues of five species of freshwater fish from Lake Mead, USA

Content Provider	Royal Society of Chemistry (RSC)
Author	Hinners, T. Pollard, J. Cross, C. Cizdziel, J.
Copyright Year	2003
Abstract	Total mercury (Hg) concentrations were determined in seven tissues (skeletal muscle, liver, blood, gonad, brain, gill, and heart) of 59 striped bass and four tissues (muscle, liver, blood, and gonad) of 69 largemouth bass, 76 channel catfish, 12 bluegill, and 22 blue tilapia collected from Lake Mead, USA. Mercury levels generally increased according to trophic level and fish length. For striped bass, mean Hg levels (ng g−1, wet mass) were highest in the liver (531), followed by muscle (309), heart (186), gonad (136), brain (77), gill (52), and blood (36). Similarly, Hg levels in the catfish and tilapia were liver > muscle > gonad > blood. In contrast, largemouth bass and bluegill had the highest levels in muscle, followed by liver, gonad, and blood. Generally, Hg levels were strongly correlated among the tissues, especially for blood/muscle and blood/liver. As the body burden of Hg increased, the concentration in blood and organs increased relative to the concentration in muscle. The trend was most pronounced for the liver. These relationships could form the basis of a predictive model and suggest that blood and muscle (plugs) could be useful for a non-lethal measure of Hg concentration and exposure in fish. For the striped bass, elevated Hg levels in the tissues were also correlated with degree of emaciation. Liver-to-muscle ratios were similar to literature values, except for tilapia with an average ratio of ∼1.7, which is higher than generally reported for non-piscivores. Finally, this study demonstrates the usefulness of a solid sampling approach in trace element monitoring, especially as pertaining to in vivo analysis, analysis of a large number of samples and reduction of contamination risk.
Starting Page	802
Ending Page	807
Page Count	6
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	5
Issue Number	5
Journal	Journal of Environmental Monitoring
DOI	10.1039/b307641p
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lake Mead USA Methylmercury Skeletal muscle Liver Gonad Gill Striped bass Largemouth bass Channel catfish Bluegill Oreochromis aureus Project Mercury Trophic level Catfish Tilapia Biomonitoring Trace element
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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