AI Article Synopsis
- Laboratory tests on one-year-old rainbow trout were conducted to assess their ability to detect and avoid hexavalent chromium (Cr(6+)).
- The fish showed significant avoidance behavior at concentrations of 0.003 mg Cr/L and higher, indicating a strong response that increased with the concentration of Cr(6+).
- The estimated avoidance threshold for the fish was found to be 0.0017 mg Cr/L, which is much lower than the maximum-permitted concentration of 0.01 mg Cr/L set by Lithuanian water-quality guidelines for protecting aquatic life.
Article Abstract
Laboratory tests were conducted on one-year-old rainbow trout Oncorhynchus mykiss to evaluate their ability to detect and avoid hexavalent chromium (Cr(6+)). Test fish were given a choice to discriminate between clean water and Cr(6+) 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 Cr(6+) 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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| http://dx.doi.org/10.1007/s00128-007-9236-1 | DOI Listing |
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