Download or read book Post release Survival of Chinook Salmon and Steelhead Trout from an Experimental Commercial Fish Trap in the Lower Columbia River WA written by Adrian McFarland Tuohy and published by . This book was released on 2018 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gillnets and other conventional harvest techniques utilized in mixed-stock commercial salmon fisheries frequently result in bycatch mortality. In many parts of the U.S Pacific Northwest, bycatch and hatchery impacts impede the recovery of Endangered Species Act (ESA)-listed salmonids and constrain commercial fishing opportunities. For the benefit of wild salmon, threatened ecosystems, and coastal fishing communities, a post-release survival study was conducted on the lower Columbia River to evaluate the potential of an alternative commercial gear—an experimental pound net trap—as a live-capture, stock-selective harvest technique. Expanding upon a 2016 pilot study, a modified trap was constructed and operated under a variety of tidal stages, light levels, and weather conditions between August 26 and September 27, 2017. Utilizing a paired mark-release-recapture procedure with Passive Integrated Transponder (PIT) tags, post-release survival from the trap was estimated through the Cormack-Jolly-Seber method; catch-per-unit-effort (CPUE) and covariates of CPUE were analyzed through Generalized Linear Models (GLM). Results demonstrated that pound net traps can effectively target commercially viable quantities of hatchery reared fall Chinook (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) while reducing cumulative bycatch mortality of ESA-listed species relative to conventional and alternative commercial gears. During the study period, 7,129 salmonids were captured and released. The ratio of wild to hatchery-origin salmonids captured was approximately 1:3. Cumulative survival to McNary Dam ranged from 94.4% for steelhead trout (O. mykiss) to 99.5% for Chinook salmon, warranting application of the gear as a stock-selective harvest tool in commercial salmon fisheries.

Download or read book The Columbia River Salmon and Steelhead Trout Their Fight for Survival written by Anthony Netboy and published by Seattle : University of Washington Press. This book was released on 1980 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Survival of Summer Steelhead Caught and Released from an Experimental Seine Fishery in the Lower Columbia River written by Dan Rawding and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Short term Survival of Fall Chinook and Coho Salmon Captured by Purse Seines in the Lower Columbia River 2017 written by Ben Cox (Fisheries biologist) and published by . This book was released on 2019 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Co-managers of the lower Columbia River have been exploring the viability of alternative commercial fishing gears, including beach and purse seines, to allow the selective harvest of hatchery-origin fall Chinook Oncorhynchus tshawytscha and Coho Oncorhynchus kisutch salmon. The viability of purse seines as a selective fishing gear depends on the expected survival rate of released fish. In autumn 2017, the Washington Department of Fish and Wildlife implemented a holding experiment to estimate short-term survival of Chinook and Coho salmon following capture in purse seines. Treatment fish were captured by purse seines in Columbia River Commercial Fishing Zone 5 and control fish were obtained from the Adult Fish Facility at Bonneville Dam. Paired groups of treatment and control fish were held together in net pens and their survival monitored for 48 h after capture. Mixed-effects logistic regression models were developed to explore the influence of covariates including of water temperature, body size, sort time, transport time, and reflex impairment on the probability of survival. Model selection results supported simple models and none of the covariates considered were found to significantly affect survival during this experiment. Short-term (48 h) survival for adult Chinook and Coho salmon captured in purse seines was estimated to be 97.9% (94.0 – 99.3%; 95% CL) and 98.1% (85.7– 99.8%; 95% CL), respectively.

Download or read book A Study to Assess Status of Smoltification and Fitness for Ocean Survival of Chinook Coho and Steelhead written by and published by . This book was released on 1979 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Nitrogen Concentrations in the Columbia and Snake Rivers in 1970 and Their Effect on Chinook Salmon and Steelhead Trout written by Wesley J. Ebel and published by . This book was released on 1971 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Final Report Stock Identification of Columbia River Chinook Salmon and Steelhead Trout written by Carl B. Schreck and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Passage Problems of Adult Chinook Salmon and Steelhead Trout in the Columbia River Between Bonneville and McNary Dams During 1975 written by Oregon. Fish Division and published by . This book was released on 1977 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report Concerning the 1989 In river Fall Commercial Harvest of Columbia River Fall Chinook Salmon Summer Steelhead and Sturgeon written by Oregon. Department of Fish and Wildlife and published by . This book was released on 1989* with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spring Outmigration of Wild and Hatchery Chinook Salmon and Steelhead Trout Smolts from the Imnaha River Oregon February 6 1995 June 20 1995 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For the second consecutive year, the Nez Perce Tribe, in conjunction with the Fish Passage Center, participated in the smolt monitoring program in the Imnaha River. A rotary screw trap was used to collect emigrating wild and hatchery chinook salmon (Oncorhynchus tshawytscha) and steelhead trout (Oncorhynchus mykiss) smolts from February 6 to June 20, 1995. We PIT tagged and released 421 wild chinook salmon smolts, 747 hatchery chinook salmon smolts (445 HxW and 302 HxH), 227 wild steelhead trout smolts and 1,296 hatchery steelhead trout smolts. Cumulative interrogation rates at mainstem Snake and Columbia River dams were 78.4% for wild chinook salmon, 58.9% for hatchery chinook salmon (HxW), 56.6% for hatchery chinook salmon (HxH), 76.2% for wild steelhead trout, and 69.2% for hatchery steelhead trout. Peak outmigration of NPT tagged wild Imnaha River chinook salmon smolts occurred from early to mid-May at Lower Granite, Little Goose, and Lower Monumental Dams. Median and 90% passage dates for wild chinook salmon smolts at Lower Granite Dam were May 1 and May 11, respectively. Continuous spill at Lower Granite Dam was initiated on May 3 and lasted for 51 days. The 90% passage date of wild chinook salmon smolts at Lower Granite Dam (May 11) preceded peak Snake River and Lower Granite (June 6) flows by 26 days. Although hatchery chinook salmon exhibited a shorter outmigration period through the Snake River than their wild counterparts, peak arrival for both groups occurred at approximately the same time. Median and 90% passage dates at Lower Granite Dam for other PIT tagged groups were: hatchery chinook salmon (NPT-HxW) - May 2 and May 13; hatchery chinook salmon (FPC-HxH) - May 8 and May 15; wild steelhead trout - May 2 and May 9; and hatchery steelhead trout (NPT and FPC) - May 31 and June 16. Hatchery steelhead trout displayed small peaks in arrival timing at Lower Granite and Little Goose Dams in mid-May to mid-June.

Download or read book Flow survival Relationship written by Willis E. McConnaha and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A memorandum to the Monitoring and Evaluation Group from Chip McConnaha documenting research done on reservoir survival of Chinook salmon and steelhead trout in the Columbia River Basin.

Download or read book Report Concerning the 1995 In river Fall Commercial Harvest of Columbia River Fall Chinook Salmon Summer Steelhead and Sturgeon written by Oregon. Department of Fish and Wildlife and published by . This book was released on 1995 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stock Identification of Columbia River Chinook Salmon and Steelhead Trout written by Carl B. Schreck and published by . This book was released on 1985 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1986-08 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Emigration of Natural and Hatchery Chinook Salmon and Steelhead Smolts from the Imnaha River Oregon Progress Report 2000 2002 written by and published by . This book was released on 2003 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the emigration studies of the Nez Perce Tribe in the Imnaha River subbasin during the 2001 and 2002 migration years. A migration year for the Imnaha River is defined here as beginning July 31 of the previous year and ending July 30 the following year. The conclusion of the studies at the end of migration year 2002 marked the 11th year of the Nez Perce Tribe's Lower Snake River Emigration Studies. The Nez Perce Tribe has participated in the Fish Passage Center's Smolt Monitoring Program for nine of the 11 years. These studies collect and tag juvenile chinook salmon and steelhead at two locations in the fall, rkm 74 and rkm 7, and at rkm 7 during the spring. Data from captured and tagged fish provide an evaluation of hatchery production and releases strategies, post release survival of hatchery chinook salmon, abundance of natural chinook salmon, and downstream survival and arrival timing of natural and hatchery chinook salmon and steelhead. The hydrologic conditions that migrating fish encountered in 2001 were characterized as a drought and conditions in 2002 were characterized as below average. Hatchery chinook salmon had a mean fork length that was 34 mm greater in 2001 and 35 mm greater in 2002 than the mean fork length of natural chinook smolts. Hatchery steelhead smolt mean fork lengths were 39 mm greater than natural steelhead smolts in 2001 and 44 mm greater than natural steelhead smolt fork lengths in 2002. A significant difference (p

Download or read book Stock Identification of Columbia River Chinook Salmon and Steelhead Trout written by Carl B. Schreck and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relationship Between River Flow and Survival for Columbia River Chinook Salmon written by Ray Hilborn and published by . This book was released on 1993 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A report on a study that explores the relationship between Columbia River flow, and survival from hatchery release to recovery of adults in catch and escapement for Columbia River chinook salmon.