Why did EPA perform the bluegill sunfish toxicity test?

On December 17, 2004 (69 FR 75541), EPA announced the availability of a draft revision of its currently recommended aquatic life water quality criteria for selenium, and solicited scientific information, data, and views thereon. Some of the responses from the public indicated that EPA's interpretation of a key study, involving juvenile bluegill sunfish under winter temperature conditions, was problematic due to limitations of the study design and lack of corroboration. To address these problems, EPA has undertaken and completed a new study, designed to establish an unambiguous threshold concentration for the effect.

The document “Effect of Selenium on Juvenile Bluegill Sunfish at Reduced Temperature” in the docket for this notice describes this work. EPA intends to review any scientific information, data and views submitted in response to today's notice, along with the information previously submitted to EPA. For additional information on EPA's draft aquatic life water quality ... more.

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