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

ESU is evergreen forest. Between 1940 and 1984, 85% of the basin was clear-cut logged (Blum
1988). Roughly 77% of the land in Ozette Basin is managed for timber production (Jacobs,
Larson et al. 1996). The extent to which pesticide products are currently used by these
companies is unknown.
Ozette Lake is in a sparsely populated area, with less than 1% of land developed. No crop land
was identified in NLCD data (Table 32). The land use and environmental data indicate that the
Ozette Lake sockeye salmon may be exposed to carbaryl or carbofuran if applied in the
watershed. Carbaryl is registered for a number of non-agricultural applications which may take
place in forested and residential areas. Additionally, the area has a small population, making
residential use of carbaryl within the ESU a possibility. We do not expect 24(c) registrations of
carbofuran will be used within this ESU, though it may be applied to pine seedlings. However,
there are few data available on use and no monitoring data are currently available. We do not
expect methomyl to be used within the boundaries of this ESU.
Ozette Lake sockeye salmon enter the lake between April and August, and spawning occurs late
October through February. Fry emerge from gravel redds in the spring and emigrate to the open
waters of the lake where they remain for a full year. They then smolt as 1-year olds and migrate
to the open ocean. The majority of Ozette Lake sockeye salmon return to spawn as four-year old
fish after spending two full years at sea.
Given the life history of the Ozette Lake sockeye, we expect that that the proposed uses of
carbaryl and carbofuran pesticide products may contaminate aquatic habitats used by sockeye in
a way that might lead to individual fitness level consequences. While the uses of these materials
may lead to some overlap with the Ozette Lake sockeye, the existing and likely future land uses
should limit the applications of pesticides containing the three carbamates. Consequently, the
risk posed by the proposed action to Ozette Lake sockeye salmon’s survival and recovery is low
for carbaryl, carbofuran, and methomyl.
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