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

Since the original listing and status review, little new data are available or suitable for
analyzing trends or estimating changes in the Eel River population’s growth rate (Good,
Waples et al. 2005). Historical and current abundance information indicates that
independent populations of Chinook salmon are depressed in many of those basins where
they have been monitored.
Critical Habitat
Critical habitat was designated for this species on September 2, 2005 (70 FR 52630).
The critical habitat designation for this ESU identifies PCEs that include sites necessary
to support one or more Chinook salmon life stages. Specific sites include freshwater
spawning sites, freshwater rearing sites, freshwater migration corridors, nearshore marine
habitat, and estuarine areas. The physical or biological features that characterize these
sites include water quality and quantity, natural cover, forage, adequate passage
conditions, and floodplain connectivity. Critical habitat in this ESU consists of limited
quantity and quality summer and winter rearing habitat, as well as marginal spawning
habitat. Compared to historical conditions, there are fewer pools, limited cover, and
reduced habitat complexity. The limited instream cover that does exist is provided
mainly by large cobble and overhanging vegetation. Instream large woody debris,
needed for foraging sites, cover, and velocity refuges is especially lacking in most of the
streams throughout the basin. NMFS has determined that these degraded habitat
conditions are, in part, the result of many human-induced factors affecting critical habitat.
They include dam construction, agricultural and mining activities, urbanization, stream
channelization, water diversion, and logging.
Central Valley Spring­Run Chinook Salmon
Distribution
The Central Valley spring-run (CV) Chinook salmon includes all naturally spawned
populations of spring-run Chinook salmon in the Sacramento River and its tributaries in
California (Figure 8).
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