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

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occupied by any life stage of coho salmon. Of 155 historical streams for which data are<br />

available, 63% likely still support coho salmon. Limiting factors identified for this<br />

species include: (1) Loss of channel complexity, connectivity <strong>and</strong> sinuosity, (2) loss of<br />

floodplain <strong>and</strong> estuarine habitats, (3) loss of riparian habitats <strong>and</strong> large in-river wood, (4)<br />

reduced streamflow, (5) poor water quality, temperature <strong>and</strong> excessive sedimentation,<br />

<strong>and</strong> (6) unscreened diversions <strong>and</strong> fish passage structures.<br />

Oregon Coast Coho Salmon<br />

Distribution<br />

The Oregon Coast (OC) coho salmon ESU includes all naturally spawned populations of<br />

coho salmon in Oregon coastal streams south of the Columbia River <strong>and</strong> north of Cape<br />

Blanco (63 FR 42587; August 10, 1998; Figure 21). One hatchery stock, the Cow Creek<br />

(ODFW stock # 37) hatchery coho, is considered part of the ESU. Table 17 identifies<br />

populations within the OC coho salmon ESU, their abundances, <strong>and</strong> hatchery input.<br />

Table 17. Oregon Coast Coho salmon populations, abundances, <strong>and</strong> hatchery<br />

contributions (Good, Waples et al. 2005).<br />

Basin<br />

Historical<br />

Abundance<br />

Recent<br />

Spawner<br />

Abundance<br />

Hatchery<br />

Abundance<br />

Contributions<br />

Necanicum Unknown 1,889 35-40%<br />

Nehalem Unknown 18,741 40-75%<br />

Tillamook Unknown 3,949 30-35%<br />

Nestucca Unknown 3,846 ~5%<br />

Siletz Unknown 2,295 ~50%<br />

Yaquima Unknown 3,665 ~25%<br />

Alsea Unknown 3,621 ~40%<br />

Siuslaw Unknown 16,213 ~40%<br />

Umpqua Unknown 24,351

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