Annual Coded Wire Tag Program; Oregon Missing Production Groups, 1998 Annual Report.
This annual report is in fulfillment of contract obligations with Bonneville Power Administration which is the funding source for the Oregon Department of Fish and Wildlife's Annual Coded Wire Tag Program - Oregon Missing Production Groups Project. Tule stock fall chinook were caught primarily in British Columbia and Washington ocean, and Columbia Basin fisheries. Up-river bright stock fall chinook contributed primarily to Alaska and British Columbia ocean commercial, Columbia Basin gillnet and other freshwater fisheries. Contribution of Rogue stock fall chinook released in the lower Columbia River occurred primarily in Oregon ocean commercial, Columbia Basin gillnet and other freshwater fisheries. Willamette stock spring chinook contributed primarily to Alaska and British Columbia ocean, and Columbia Basin fisheries. Willamette stock spring chinook released by CEDC contributed to similar ocean fisheries, but had much higher catch in Columbia Basin gillnet fisheries than the same stocks released in the Willamette Basin. Up-river stocks of spring chinook contributed almost exclusively to Columbia Basin fisheries. The up-river stocks of Columbia River summer steelhead contributed almost exclusively to the Columbia Basin gillnet and other freshwater fisheries. Coho ocean fisheries from Washington to California were closed or very limited from 1994 through 1998 (1991 through 1995 broods). This has resulted in a lower percent of catch in Washington, Oregon and California ocean fisheries, and a higher percent of catch in Alaska and British Columbia ocean and Columbia Basin freshwater fisheries. Coho stocks released by ODFW below Bonneville Dam were caught mainly in Oregon and Washington ocean, Columbia Gillnet and other freshwater fisheries. Coho stocks released in the Klaskanine River and Youngs Bay area had similar ocean catch distributions, but a much higher percent catch in gillnet fisheries than the other coho releases. Ocean catch distribution of coho stocks released above Bonneville Dam was similar to the other coho groups. However, they had a higher percent catch in gillnet fisheries above Bonneville Dam than coho released below the dam. Survival rates of salmon and steelhead are influenced, not only by factors in the hatchery (disease, density, diet, size and time of release) but also by environmental factors in the river and ocean. These environmental factors are influenced by large scale oceanic and weather patterns such as El Nino. Changes in rearing conditions in the hatchery do impact survival, however, these can be offset by impacts caused by environmental factors. Coho salmon released in the Columbia River generally experience better survival rates when released later in the spring. However, for the 1990 brood year June releases of Columbia River coho had much lower survival than May releases, for all ODFW hatcheries. In general survival of ODFW Columbia River hatchery coho has declined to low levels in recent years. Results from evaluation of photonic marking as a tool to mass mark juvenile salmonids were mixed (Appendix B). Logistical and safety concerns were documented. The mark was not retained through to adult return as no photonic marks were detected in any of the Sandy hatchery jack or adult coho recoveries. Data from coded-wire tag recoveries indicated there should have been approximately 6 jack and 318 adult coho recovered with photonic marks. Photonic marks were retained for the 5 months from marking to release. Photonic marking did not appear to effect in-hatchery survival or hatchery return rate. Because of the above results evaluation of photonic marking was discontinued in favor of evaluation of Visual Implant Elastomer tagging. Results in 1998 with Sandy hatchery coho demonstrated a marking rate of 17,000 fish per day for VIE tagging (Appendix C). Mark retention at releases was 98% for VIE tags. Although, this included re-marking 22% of the fish during the coded-wire tagging process (4 months after the VIE marks were applied).
- Research Organization:
- Oregon Department of Fish and Wildlife
- Sponsoring Organization:
- US Bonneville Power Administration
- DOE Contract Number:
- 1989BP01610
- OSTI ID:
- 861476
- Report Number(s):
- DOE/BP-01610-7; TRN: US200601%%868
- Country of Publication:
- United States
- Language:
- English
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Annual Coded Wire Tag Program; Oregon Missing Production Groups, 1999 Annual Report.
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