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

programs. The three major river systems supporting Southern Oregon / Northern Coastal
California coast coho are the Rogue, Klamath (including the Trinity), and Eel rivers.
Life History
SONCC coho salmon enter rivers in September or October. River entry is much later
south of the Klamath River Basin, occurring in November and December, in basins south
of the Klamath River to the Mattole River, California. River entry occurs from mid-
Decmeber to mid-February in rivers farther south. Because coho salmon enter rivers late
and spawn late south of the Mattole River, they spend much less time in the river prior to
spawning. Coho salmon adults spawn at age three, spending just over a year in
freshwater and a year and a half in the ocean.
Status and Trends
SONCC coho salmon were listed as threatened on May 7, 1997 (62 FR 24588). This
species retained its original classification when its status was reviewed on June 28, 2005
(70 FR 37160). The status of coho salmon coast wide, including the SONCC coho
salmon ESU, was formally assessed in 1995 (Weitkamp, Wainwright et al. 1995). Two
subsequent status review updates have been published by NMFS. One review update
addressed all West Coast coho salmon ESUs (Busby, Wainwright et al. 1996). The
second update specifically addressed the Oregon Coast and SONCC coho salmon ESUs
(Gustafson, Wainwright et al. 1997). In the 1997 status update, estimates of natural
population abundance were based on very limited information. New data on
presence/absence in northern California streams that historically supported coho salmon
were even more disturbing than earlier results. Data indicated that a smaller percentage
of streams contained coho salmon compared to the percentage presence in an earlier
study. However, it was unclear whether these new data represented actual trends in local
extinctions, or were biased by sampling effort.
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