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GRANT
NUMBER:
NA96FD0130
NMFS NUMBER:
99-NWR-015
REPORT
TITLE:
Rebuilding
Naturally Spawning Coho Stocks: An Assessment of Bycatch
Reduction Measures and Spawning Escapement Stock Composition
in the Southern Puget Sound (Fishery Management Area 13D-K)
AUTHOR:
Squaxin Island Tribe Department of Natural Resources
PUBLISH
DATE:
May 31, 2000
AVAILABLE
FROM:
National
Marine Fisheries Service, Northwest Regional Office, 7600
Sand Point Way, NE, Seattle, WA 98115. PHONE: (206)
526-6115
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ABSTRACT
The investigators
examined the contribution of natural coho salmon to the
total coho salmon harvest in the Squaxin Island Tribes
commercial coho salmon fishery during the 1999 and 2000
commercial fisheries. The investigators also examined
the contribution of hatchery strays to coho salmon escapement
in local streams. Commercial harvest during the two years
was extremely variable. The 1999 harvest (5,282) was the
lowest on record, while the 2000 harvest (77,847) was
within the range observed during the past decade. Natural
coho salmon contributed 5 percent or less of the total
harvest during both years. This resulted in estimates
of 131 and 3,808 natural coho salmon being intercepted
in the 1999 and 2000 commercial coho salmon fisheries,
respectively. Although these are relatively small numbers,
they represented between 16 and 129 percent of the total
escapement of coho salmon (both natural and hatchery)
to local streams.
The
contribution of hatchery strays to escapement in local
streams was spatially and temporally variable. Hatchery
strays contributed a greater proportion of the total escapement
during 1999 and 2000 in two local streams. The proportion
of hatchery strays observed in Mill Creek was more than
twice that observed in Cranberry Creek. However, sample
sizes were small (n = 12 to 75) for these streams. The
proportion of coho salmon carcasses sampled found to be
hatchery origin based on adipose fin clips varied from
0.0 to 88.9 percent for five streams. Sample sizes were
extremely small (n = 1 to 9) for all but one stream (n
= 79). Overall, 32.2 percent of all coho salmon sampled
in local streams were hatchery strays. Results from this
study will be used to reduce the interception of natural
coho salmon in the Squaxin Island Tribes commercial coho
salmon fishery. Results also will be used to improve estimates
of natural coho salmon escapement into local streams and
provide insight into means of limiting the influence of
hatchery strays on local streams.
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