Abstract
Metallothionein, a biomarker of exposure and toxicity of heavy metals, has been detected in the gills of brown trout (Salmo trutta fario L.) and rainbow trout (Oncorhynchus mykiss Richardson) by means of immunohistochemistry. A very prominent labelling of chloride cells was found after exposure to diluted sewage plant effluents. No significant increase was observed in either the number of labelled cells or their labelling intensity after exposure to water of a polluted river compared to fish kept in tap water. These results do not correlate with findings of a histopathological study, suggesting that the metal levels at the sewage treatment plant were too low to produce gross histopathology. A comparison between the species indicated that the rainbow trout showed a generally higher metallothionein expression than the brown trout.
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Burkhardt-Holm, P., Bernet, D. & Hogstrand, C. Increase of Metallothionein-immunopositive Chloride Cells in the Gills of Brown Trout and Rainbow Trout After Exposure to Sewage Treatment Plant Effluents. Histochem J 31, 339–346 (1999). https://doi.org/10.1023/A:1003726123083
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DOI: https://doi.org/10.1023/A:1003726123083