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

Table 15. CCC Coho salmon populations, abundances, and hatchery contributions (Good,
Waples et al. 2005).
Historical 1987-1991
Hatchery
River/Region
Escapement Escapement Abundance
(1963)
Abundance Contributions
Ten Mile River 6,000 160 Unknown
Noyo River 6,000 3,740 Unknown
Big River 6,000 280 Unknown
Navarro River 7,000 300 Unknown
Garcia River 2,000 500 (1984-1985) Unknown
Other Mendacino County rivers 10,000 470 Unknown
Gualala River 4,000 200 Unknown
Russian River 5,000 255 Unknown
Other Sonoma County rivers 1,000 180 Unknown
Marin County 5,000 435 Unknown
San Mateo County 1,000 Unknown Unknown
Santa Cruz County 1,500 50 (1984-1985) Unknown
San Lorenzo River 1,600 Unknown Unknown
Total
200,000-
500,000
6,570 (min)
Life History
Both run and spawn timing of coho salmon in this region are very late (both peaking in
January), with little time spent in freshwater between river entry and spawning. This
compressed adult freshwater residency appears to coincide with the single, brief peak of
river flow characteristic of this area.
Status and Trends
The CCC coho salmon ESU was originally listed as threatened under the ESA on October
31, 1996 (61 FR 56138) and later revised to endangered status on June 28, 2005 (70 FR
37160). The ESU includes all naturally spawned populations of coho salmon from Punta
Gorda in northern California south to and including the San Lorenzo River in central
California, as well as populations in tributaries to San Francisco Bay, excluding the
Sacramento-San Joaquin River system. The ESU also includes four artificial propagation
programs: the Don Clausen Fish Hatchery Captive Broodstock Program, Scott
Creek/King Fisher Flats Conservation Program, Scott Creek Captive Broodstock
Program, and the Noyo River Fish Station egg-take Program coho hatchery programs.
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