Gill lesions and death of bluegill in an acid mine drainage mixing zone

Environmental Toxicology and Chemistry
By: , and 



The toxicity of an acid mine drainage (AMD) mixing zone was investigated by placing bluegill (Lepomis macrochirus) at the confluence of a stream contaminated by AMD and a stream having neutral pH. A mixing channel receiving water from both streams was assembled in the field, during July and October 1996, to determine the toxicity of freshly mixed and aged water (2.9–7.5 min). The AMD stream had elevated concentrations of Al and Fe, which precipitated upon mixing, and of Mn, which did not precipitate in the mixing zone. Fish exposed to freshly mixed water had higher mortality than fish exposed to water after aging. Precipitating Al, but not Fe, accumulated on the gills of bluegill, and accumulation was more rapid early during the mixing process than after aging. Fish exposed for 3.5 h to freshly mixed water had hypertrophy and hyperplasia of gill filament and lamellar epithelial cells. Similar lesions were observed after 6.0 h in fish exposed to water aged after mixing. Results demonstrated that Al was the predominant metal accumulating on the gills of fish in this AMD mixing zone, and that mixing zones can be more toxic than AMD streams in equilibrium.

Publication type Article
Publication Subtype Journal Article
Title Gill lesions and death of bluegill in an acid mine drainage mixing zone
Series title Environmental Toxicology and Chemistry
DOI 10.1002/etc.5620200619
Volume 20
Issue 6
Year Published 2001
Language English
Publisher Wiley
Contributing office(s) Columbia Environmental Research Center
Description 8 p.
First page 1304
Last page 1311
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