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Updated Review of the Status of the Upper Willamette River and Middle Columbia River ESUs of Steelhead (Oncorhynchus mykiss)
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1999
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[PDF-1.83 MB]
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Description:The National Marine Fisheries Service (NMFS) published a status review on steelhead (anadromous Oncorhynchus mykiss) from Pacific coast U.S. states in 1996 (Busby et al. 1996). In that document, 15 evolutionarily significant units (ESUs) of steelhead were described. NMFS has also considered the status of these ESUs under the U.S. Endangered Species Act (ESA). At present, seven ESUs are listed under the ESA (two as endangered and five as threatened), three are candidate species, and three are not warranted for listing (Table 1). The remaining two ESUs have been proposed for listing, information related to the final listing determination is considered in this document.
On 10 March 1998, NMFS proposed to list the Upper Willamette River (UWR) and Middle Columbia River (MCR) steelhead ESUs as threatened under the ESA (NMFS 1998). This proposal was based on the findings ofa Biological Review Team (BRT) of scientists from NMFS and the Biological Resources Division of the U.S. Geological Survey (BRD-USGS) (Schiewe 1997). Following the proposed listing, NMFS received comments and data from several interested parties, including state and tribal agencies. The BRT met again in November 1998 to consider this new information. This document summarizes the new information and the final conclusions of the BRT.
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Rights Information:Public Domain
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