Avoidance Response of Rainbow Trout Oncorhynchus mykiss to Hexavalent Chromium Solutions
Laboratory tests were conducted on one-year-old rainbow trout Oncorhynchus mykiss to evaluate their ability to detect and avoid hexavalent chromium (Cr⁶⁺). Test fish were given a choice to discriminate between clean water and Cr⁶⁺ solutions of six sublethal concentrations ranging from 0.0015 to 0.3...
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Veröffentlicht in: | Bulletin of environmental contamination and toxicology 2007-12, Vol.79 (6), p.596-600 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Laboratory tests were conducted on one-year-old rainbow trout Oncorhynchus mykiss to evaluate their ability to detect and avoid hexavalent chromium (Cr⁶⁺). Test fish were given a choice to discriminate between clean water and Cr⁶⁺ solutions of six sublethal concentrations ranging from 0.0015 to 0.3 mg Cr/L in a counter-current flow, steep gradient chamber. The intensity of avoidance response reached a significant level at test concentrations of 0.003 mg Cr/L and higher, and was directly proportional to the Cr⁶⁺ concentration logarithm. Avoidance threshold was estimated through regression analysis and to be 0.0017 mg Cr/L. This result is approximately sixfold lower than maximum-permitted concentration of 0.01 mg Cr/L accepted as the Lithuanian water-quality guideline for the protection of aquatic life. |
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ISSN: | 0007-4861 1432-0800 |
DOI: | 10.1007/s00128-007-9236-1 |