Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

Columbia River chum salmon are not caught incidentally in tribal fisheries above
Bonneville Dam. However, Columbia River chum salmon are incidentally caught
occasionally in non-Indian fall season fisheries below Bonneville Dam. There are no
fisheries in the Columbia River that target hatchery or natural-origin chum salmon. The
species’ later fall return timing make them vulnerable to relatively little potential harvest
in fisheries that target Chinook salmon and coho salmon. Columbia River chum salmon
rarely take the sport gear used to target other species. Incidental catch of chum amounts
to a few tens of fish per year (TAC 2008). The harvest rate of Columbia River chum
salmon in proposed state fisheries in the lower river is estimated to be 1.6% per year and
is less than 5%.
LCR coho salmon are harvested in the ocean and in the Columbia River and tributary
freshwater fisheries of Oregon and Washington. Incidental take of coho salmon prior to
the 1990s fluctuated from approximately 60 to 90%. However, this number has been
reduced since its listing to 15 to 25% (LCFRB 2004). The exploitation of hatchery coho
salmon has remained approximately 50% through the use of selective fisheries.
LCR steelhead are harvested in Columbia River and tributary freshwater fisheries of
Oregon and Washington. Fishery impacts of LCR steelhead have been limited to less
than 10% since implementation of mark-selective fisheries during the 1980s. Recent
harvest rates on UCR steelhead in non-Treaty and treaty Indian fisheries ranged from 1%
to 2%, and 4.1% to 12.4%, respectively (FCRPS 2008).
Alien Species
Many non-native species have been introduced to the Columbia River Basin since the
1880s. At least 81 invasive species have currently been identified, composing one-fifth
of all species in some areas. New non-native species are discovered in the basin
regularly; a new aquatic invertebrate is discovered approximately every 5 months
(Sytsma, Cordell et al. 2004). It is clear that the introduction of non-native species has
changed the environment, though whether these changes will impact salmonid
populations is uncertain (Sytsma, Cordell et al. 2004).
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