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

miles where agricultural crops are at the river’s edge. Drift and runoff occurring in conjunction
with sockeye salmon migration is expected to cause adverse effect.
Given the life history of the SR sockeye, we expect the proposed uses of carbaryl, carbofuran,
and methomyl pesticide products may lead to individual fitness level consequences. However,
we do not expect fry to be exposed to the a.i.s, although some exposure may occur during adult
migration and lead to acute lethality or temporary AChE inhibition. However, this exposure is
not expected to occur at a frequency that would cause effects at the population level. Therefore,
the risk to this species’ survival and recovery from the stressors of the action is low for carbaryl,
carbofuran, and methomyl.
Central California Coast steelhead
The CCC steelhead DPS includes all naturally spawned steelhead in streams from the Russian
River south to Aptos Creek. This area includes streams entering the San Francisco Bay. The
DPS consists of nine historic independent populations. There is limited information on the
abundance of these populations, but all are in severe decline.
The major threats to this DPS identified in the Status of Listed Resources and Environmental
Baseline sections are dams and other migration barriers, urbanization and channel modification,
agricultural activities, predators, hatcheries, and water diversions. Throughout the species’
range, habitat conditions and quality have been degraded by a lack of channel complexity,
eroded banks, turbid and contaminated water, low summer flow and high water temperatures, an
array of contaminants found at toxic levels, and restricted access to cooler head waters from
migration barriers. There is limited monitoring data from streams within this DPS. The
combined impacts of these threats continue to affect the CCC steelhead.
Crop farming is concentrated in low laying areas and floodplains along the estuaries and stream
valleys of the Russian River and Santa Cruz drainage basins. Christmas trees production occurs
in these areas in addition to a variety of food crops. Carbaryl and methomyl are registered for a
variety crops grown in the Russian River valley and in the San Mateo and Santa Cruz counties.
Registered 24(c) uses for carbaryl in California include application to fruits and nuts, prickly
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