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

the only two populations with significant natural production (Sandy and Clackamas),
short- and long-term trends are negative and productivity (as gauged by pre-harvest
recruits) is down sharply from recent (1980s) levels.
The Federal Columbia River Power System Opinion (FCRPS) (2008) describes this ESU
as consisting of three MPGs. Each is comprised of three to 14 populations. In many
cases, populations have low abundance and natural runs have been extensively replaced
by hatchery production. Abundance estimates are available for only five populations and
trend estimates for only two. Time series are not available for Washington coho
populations. The 100-year risk of extinction was derived qualitatively, based on risk
categories and criteria identified by the W/LCTRT in 2004. Most of the population of
LCR had high or very high extinction risk probabilities. Spatial structure has been
substantially reduced by the loss of access to the upper portions of some basins from
tributary hydro development (i.e., Condit Dam on the Big White Salmon River and
Powerdale Dam on the Hood River). Finally, the diversity of populations in all three
MPGs has been eroded by large hatchery influences and periodically, low effective
population sizes. Nevertheless, the genetic legacy of the Lewis and Cowlitz River coho
salmon populations is preserved in ongoing hatchery programs.
Critical Habitat
NMFS has not designated critical habitat for LCR coho salmon.
SONCC Coho Salmon
Distribution
SONCC coho salmon consists of all naturally spawning populations of coho salmon that
reside below long-term, naturally impassible barriers in streams between Punta Gorda,
California and Cape Blanco, Oregon (Figure 20).
This ESU also includes three artificial propagation programs: the Cole Rivers Hatchery
(ODFW stock #52), Trinity River Hatchery, and Iron Gate Hatchery coho hatchery
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