Effective policies for the conservation of endangered species must be informed by robust scientific study. In cases where endangered fish and wildlife species move across international boundaries, conservation policy requires transboundary cooperation and collaboration among researchers as well as regulatory agencies. The Salish sucker (Catostomus sp.) is one such species, an endangered fish found in river systems surrounding and crossing the Canada – U.S. border in southwestern British Columbia and northwestern Washington (McPhail 1987). Despite its limited geographic distribution, the Salish sucker’s range encompasses a variety of land uses and differing habitat threats on either side of the border.
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