1. Spawner - recruit relationships for spring and summer Chinook salmon populations in several Columbia and Snake River subbasins by Petrosky, Charles E. Publication: S.l. s.n. 1995 . 115 p. , 50027 28 cm. Date:1995 Availability: Copies available: StreamNet Library StreamNet References [StreamNet Reference] (1), Log in to add tags. Match: ... Spawner - recruit relationships for spring and summer Chinook salmon populations in several Columbia and Snake River subbasins ... This report reviews and updates spawner and recruit data for Snake and Columbia River spring/summer chinook [sic] stocks; develops data for index stocks subjected to varying levels of human-induced mortality from hydropower, habitat, and hatchery effects; provides consistent data based on standard methods and spreadsheets; and identifies index stocks, data sources, calculation methods, and assumptions. Numbers of spawners and returning recruits to the mouth of the Columbia River were estimated for 11 index populations from the Deschutes, John Day, Grande Ronde, Salmon, and Imnaha River subbasins using spawning ground surveys, age frequencies, mainstem and tributary harvest rates, and mainstem conversion rates available from the 1950's to present. Average numbers of spawners, recruits per spawner, and spawners per spawner varied substantially from year to year and stock-recruitment functions generally accounted for less than half of this variability. Since 1970, average productivity expressed in terms of recruits per spawner and spawners per spawner was much less in Snake River populations than in lower Columbia River populations. Average number of Columbia River recruits per spawner and spawners per spawner generally declined between the late 1950's and present and the decline was more pronounced among Snake River populations. More intensive analysis of these data based on population-specific interpretations and stochastic risk analyses which incorporate the observed variability is required to project future trends and population responses to management alternatives. ... population estimates ... spawner-recruit ... Spawner ... Actions: Add to Cart
2. Factors affecting the abundance of 1977-79 brood wild fall Chinook salmon [Oncorhynchus tshawytscha] in the Lewis River, Washington by McIsaac, Donald O'Hanley Publication: Seattle, WA University of Washington 1990 . x, 174 p. , 318 28 cm. Date:1990 Availability: Copies available: StreamNet Library [SH 222 .W2 L495 1977/79] (1), Match: ... The Lewis River supports one of the largest and most stable populations of fall chinook [sic] salmon in the Columbia River basin. This wild population has exhibited relative constancy in abundance during the recent 50 years, in contrast to most other wild chinook populations in the basin. The success of the Lewis River population has occurred despite extensive environmental changes associated with hydro-power development, intensive mixed stock marine and freshwater chinook fisheries and large scale hatchery development. To study the paradoxical success of the Lewis River population, wild juvenile fish comprising three treatments in each of three consecutive brood years were tagged and recaptured in subsequent life stages. Life history parameters were estimated for this wild population and compared to estimates of these same parameters for 15 hatchery populations of fall chinook. Additionally, a 21 year data set consisting of river flow records, hatchery releases and Lewis River wild spawner abundance was analyzed to determine how environmental influences affect the success of the Lewis River wild stock. ... Results showed that several factors positively affected the Lewis River wild population in comparison to other Columbia River stocks, including unique migration attributes, high productivity and certain specialized limnological parameters associated with Lewis River hydropower development. Lewis River fish are less vulnerable to marine fisheries than other Columbia River fall chinook populations due to a unique oceanic feeding migration route, and also have other beneficial migration attributes. A spawner-recruit analysis indicates the Lewis River stock is inherently productive; intense intrapopulation competition for habitat in the juvenile phase contributes to highly fit smolts estimated to survive at an average rate that may be as high as 12 times greater than the average Columbia River hatchery stocks. While hydro-power developement [sic] has reduced total habitat and caused observable mortalities of wild fish annually, partially compensatory environmental benefits have also accrued, such as cleaner spawning gravel and cooler and more nutrient rich water for juvenile rearing. Recommendations are presented for further flow regulation, genetic protection guidelines and a spawning escapement goal. ... spawning recruitment ... Spawner ... Actions: Add to Cart
3. Determinants of sockeye salmon abundance in the Columbia River by Mullan, James W. Publication: Leavenworth, WA USFWS 1984 . 159 leaves , 359 29 cm. Date:1984 Availability: Copies available: StreamNet Library [SH 348 .M8438 1984] (1), Match: ... Estimates of escapement beyond the fishery became possible with the completion of Rock Island Dam in 1933, the earliest of the present-day mainstem dams located at River Mile 453. In the 1930s and early 1940s commercial catches remained depressed in relation to annual escapements of about 1% and 24%. When catch and escapement were brought more into balance beginning in 1945, the runs revived and comparative abundance was maintained to about 1960. In subsequent years, sockeye did not maintain themselves under greatly increased escapement, nor have they increased from depressed levels with curtailment of all but incidental harvest in more recent years. ... Mark-recovery programs for 1940-44 and 1960-63 brood releases show: (1) in the historic lowest and highest years of abundance (1945 and 1947), hatchery sockeye made up 10% and 11% of the runs; (2) survival of hatchery juveniles to returning adults averaged 1.62% in the 1940s compared to 0.67% in the 1960s; and (3) adults sacrificed for artificial propagation, exhibited no consistent increased efficiency, in point of returning adults, over natural recruitment based on spawner - recruit ratios. ... A varied and indeterminate array of evidence is examined for possible effects of transfer and introduction of stocks associated with artificial as well as natural propagation. It seems quite clear that kokanee entrained from the 80,000 acre reservoir (Lake Roosevelt) created by Grand Coulee Dam, positively influenced spawner-recruit ratios in the initial years of impoundment. This is particularly evident for the 1941 brood year considering that substantial numbers of kokanee could have become anadromous and returned as "sockeye". The spawner - recruit ration of 1:98.0 was aberrant, population irruption of kokanee in the new impoundment occurred, there was virtually no effective adult sockeye spawning escapement (N118), and the 1941 brood produced the record low run of sockeye in 1945. Inconclusive though other observations are, they do seem to indicated at least some interchange of genetic material between stocks. Seemingly there has been no impairment of genetic viability based on a high resiliency of survival in the face of major harvest, genetic and environmental perturbations. ... Spawner ... Actions: Add to Cart
4. Studies of hatchery and wild steelhead in the lower Columbia region by Leider, Steven A. Publication: Olympia, WA WDW 1991 . vii, 62 p. , 268 28 cm. Date:1991 Availability: Copies available: StreamNet Library [QL 639.16 .S7841 1990] (1), Match: ... 3. Collections of subyearling steelhead from the 1990 brood suggested that the distribution of steelhead spawners in the Kalama watershed may not be random with respect to race. ... spawner-recruit ... Actions: Add to Cart
5. Identification of Columbia Basin sockeye salmon stocks using scale pattern analyses in 1991 by Fryer, Jeffrey K. Publication: Portland, OR CRITFC 1992 . v, 29 p. , 165 28 cm. Date:1992 Availability: Copies available: StreamNet Library [QL 638 .S28 C64 1991] (1), Match: ... Before this study began (Schwarzberg and Fryer 1988), reliable methods for individual Columbia Basin sockeye salmon stock identification had not been developed to permit estimation of the overall run composition and the migratory characteristics of each component stock. Numerous potential research and management uses exist for such information. These include run-reconstruction studies to permit accurate population size forecasts, escapement monitoring, establishment of spawner-recruit relationships, and development of discrete-stock approaches to Columbia River mainstem harvest management. The Pacific Salmon Treaty, ratified by the United States and Canada in 1985 (PST 1985), requires that certain Pacific salmon populations be monitored to determine the influence of Treaty-imposed ocean harvest regulations on transboundary stocks. Some Okanogan stock sockeye salmon originating in Canadian waters but migrating through, and harvested in, the United States portion of the Columbia River might constitute such a stock. Stock identification research would aid in estimation of the proportion and absolute number of Canadian origin sockeye salmon caught within the United States. ... Actions: Add to Cart
6. Identification of Columbia Basin sockeye salmon stocks based on scale pattern analyses, 1990 by Fryer, Jeffrey K. Publication: Portland, OR CRITFC 1991 . iv, 40 leaves , 164 28 cm. Date:1991 Availability: Copies available: StreamNet Library [QL 638 .S28 C64 1990] (1), Match: ... Until now, reliable methods for individual Columbia Basin sockeye salmon stock indentification have not been developed to permit estimation of the overall run composition and the migratory characteristics of each component stock. Numerous potential research and management uses exist for such information. These include run-reconstruction studies to permit accurate population size forecasts, escapement monitoring, establishment of spawner-recruit relationships, and development of discrete-stock approaches to Columbia river mainstem harvest management. The Pacific Salmon Treaty, ratified by the United States and Canada in 1985 (PST 1985), requires that certain Pacific salmon populations be monitored to determine the influence of Treaty-imposed ocean harvest regulations on transboundary stocks. Some Okanogan stock sockeye salmon originating in Canadian waters but migrating through, and harvested in, the United States portion of the Columbia River might constitute such a stock. Stock identification research would aid in estimation of the proportion and absolute number of Canadian origin sockeye salmon caught within the United States. ... Actions: Add to Cart
7. Studies of hatchery and wild steelhead in the lower Columbia region by Leider, Steven A. Publication: Olympia, WA WDFW 1990 . x, 97 p. , 267 28 cm. Date:1990 Availability: Copies available: StreamNet Library [QL 639.16 .S7841 1989] (1), Match: ... 11. Methods for estimating Kalama River steelhead spawner escapement, harvest, total run size, spawner-recruit relationships, and hatchery vs. wild smolt-to-adult survival were refined and databases updated to incorporate adult returns through the 1988 summer-run and 1988-89 winter-run return cycles. ... spawner-recruit ... Actions: Add to Cart
8. Snake River sockeye salmon habitat and limnological research by Teuscher, David Publication: Portland, OR BPA 1995 . iii, 94 p. , 29084 28 cm. Date:1995 Availability: Copies available: StreamNet Library [QL 638 .S28 S63 1994] (1), Match: ... Hydroacoustic estimates of O. nerka densities in the Sawtooth Valley Lakes ranged from 32 to 339 fish/ha. Densities were greatest in Stanley followed by Redfish (217 fish/ha), Pettit (95 fish/ha), and Alturas. Except for Alturas, population abundance estimates were similar to 1993 results. In Alturas Lake, O. nerka abundance declined by approximately 90%. ... In 1994, about 142,000 kokanee fry recruited to Redfish Lake from Fishhook Creek. O. nerka fry recruitment to Stanley and Alturas lakes was 19,000 and 2,000 fry, respectively. Egg to fry survival was 11%, 13%, and 7% in Fishhook, Alturas and Stanley Lake Creeks. ... Kokanee spawning in Fishhook Creek was slightly lower than 1993 estimates but similar to the mean escapement since 1991. About 9,200 kokanee entered the creek in 1994 compared to 10,800 in 1993. Escapement for Stanley Lake Creek was only 200, a 68% reduction from 1993. Conversely, O. nerka spawning densities increased to 3,200 in Alturas Lake Creek, up from 200 the previous year. ... Approximately 92% of the O. nerka production potential of Redfish Lake is being used by Fishhook Creek kokanee. Available space for sockeye production is 20,000 10-gram fish. Expected release totals for 1995 are 100,000 juvenile sockeye, well above safe levels of supplementation. In the short term, lake fertilization is needed to meet production needs and prevent a forage crash during sockeye supplementation. For long term recovery, however, a trade-ff between kokanee and sockeye production is required. We suggest limiting Fishhook Creek fry recruitment to 50,000 per year. ... Spawning habitat is not limiting in Redfish Lake. The shoal spawning area on Sockeye Beach and in the South end of Redfish Lake should support up to 16,000 sockeye spawners. Percent fines in those areas were low (less than 35% of the substrate was smaller than 6.3 mm), and should yield moderately high egg-to-fry survival. ... Spawner ... Actions: Add to Cart
9. Snake River sockeye salmon habitat and limnological research by Teuscher, David Publication: Portland, OR BPA 1996 . 137 p. , 29370 28 cm. Date:1996 Availability: Copies available: StreamNet Library [QL 638 .S28 S63 1995] (1), Match: ... In 1995, hydroacoustic estimates of O. nerka densities in the Sawtooth Valley Lakes ranged from 57 to 465 fish/ha. Densities were greatest in Pettit followed by Redfish (167), Alturas (95), and Stanley Lakes. O. nerka numbers increased from 1994 values in Pettit and Alturas lakes, but declined in Redfish and Stanley. Despite a decline in total lake abundance, O. nerka biomass estimates in Redfish Lake increased. ... Approximately 144,000 kokanee fry recruited to Redfish Lake from Fishhook Creek. O. nerka fry recruitment in Stanley and Alturas lake was 5,000 and 30,000 fry, respectively. Egg-to-fry survival was 14% in Fishhook and 7% in Stanley Lake Creek. ... In Fishhook Creek, kokanee spawning escapement was estimated using stream surveys and a weir. Escapement estimates were 4,860 from weir counts, and 7,000 from stream surveys. As part of the kokanee reduction program, 385 of the spawning female kokanee were culled. Escapement for Stanley Lake Creek was only 60 fish, a ten fold decrease from 1994. In Alturas Lake, kokanee spawners dropped by 50% to 1,600. ... population estimates ... Spawner ... Actions: Add to Cart
10. Kokanee stock status and contribution of Cabinet Gorge Hatchery, Lake Pend Oreille, Idaho : by Bowles, Edward C. Publication: Portland Or. : BPA 1987 . iv, 59 p. : , 40326 28 cm. Date:1987 Availability: Copies available: StreamNet Library [QL 638 .S281 K653 1986] (1), Match: ... Estimated kokanee (Oncorhynchus nerka) abundance in Lake Pend Oreille was 4.3 million during September 1986. This estimate was similar to 1985 and indicates continued suppression of the kokanee population since initial decline in the late 1960s. Atypically high survival of wild fry resulted in similar fry recruitment in 1986 as 1985, whereas hatchery-reared fry contributed only 8% to total fry recruitment as a result of low post-release survival (3%). Fry released into the Clark Fork River from Cabinet Gorge Hatchery had very low survival during emigration to Lake Pend Oreille, resulting from poor flow conditions and potentially high predation. Fry survival during emigration was twice as high during nighttime flows of 16,000 cfs than 7,800 cfs. Emigration also was faster during higher flows. ... Total egg take in 1986 was 9.1 million, with 7.3 million collected at Sullivan Springs. This low take represented 32% of the eggs necessary to fill Cabinet Gorge Hatchery and reflected the lowest fry-to-adult return rate to Sullivan Springs since initiation of enhancement efforts in the mid-1970s. Low escapement to Sullivan Springs may have been the result of a major freshet in Granite Creek that flushed spawners out of the system during the peak of the run and/or straying. ... Spawner ... Actions: Add to Cart
11. Kokanee stock status and contribution of Cabinet Gorge Hatchery, Lake Pend Oreille, Idaho : by Bowles, Edward C. Publication: Portland Or. : BPA 1988 . iv, 50 p. : , 40348 28 cm. Date:1988 Availability: Copies available: StreamNet Library [QL 638 .S281 K653 1987] (1), Match: ... Estimated kokanee (Oncorhynchus nerka) abundance in Lake Pend Oreille was 6.01 million during late summer 1987. This estimate is 40% higher than the 1986 estimate and is the second largest population estimate since 1977. Higher abundance is predominantly a result of enhanced fry survival and recruitment. ... Hatchery-reared fry contribution was 22% of total fry recruitment in 1987, compared with 8% in 1986, and resulted from a fivefold increase in survival. Much of this improvement can be attributed to the large (52 mm) fry produced at Cabinet Gorge Hatchery in 1987 and represents the first measurable contribution of the new hatchery to the kokanee rehabilitation program. Survival of hatchery-reared fry released in Clark Fork River was nearly one-half that of fry released into Sullivan Springs due to poor flow conditions and potentially high predation during emigration from Cabinet Gorge Hatchery to Lake Pend Oreille. ... Spawner ... Actions: Add to Cart
12. Kootenai River white sturgeon investigations   Publication: Portland, OR BPA 1995 . iii, 68 p. , 29230 28 cm. Date:1995 Availability: Copies available: StreamNet Library [SH 167 .S7 K66 1995] (1), Match: ... Kootenai River white sturgeon spawning and recruitment evaluation ... CHAPTER 1: The Kootenai River white sturgeon was listed as an endangered species on September 4, 1994. The U.S. Fish and Wildlife Service issued a formal Biological Opinion on the Kootenai River white sturgeon to the U.S. Army Corps of Engineers and Bonneville Power Administration in relation to spring discharge below Libby Dam. These agencies were asked in the Biological Opinion to work adaptively to obtain flow conditions that were conducive to white sturgeon recruitment. The U.S. Army Corps of Engineers, in agreement with Bonneville Power Administration, provided a release of 2.09 billion cubic meters (1.7 million acre-feet) of water above minimum flow from Libby Dam from April 29 to July 17, 1995. This release of water and local inflow provided up to 1,082 m3/s (38.2 thousand cubic feet per second [kcfs]) discharge in the Kootenai River at Bonners Ferry, Idaho, on May 18, 1995. This study was designed to monitor and evaluate these flow conditions for white sturgeon spawning and recruitment. ... CHAPTER 2: We used a variety of sampling methods in an effort to determine if the higher spring flows during May and June of 1995 resulted in the production of larval and advanced young-of-the-year (YOY) white sturgeon (Acipenser transmontanus). We also attempted to sample the winter of 1994-95. Sampling commenced in April and extended through October 1995. Sampling equipment included conical larval fish nets, beam trawls, shrimp trawls, gill nets, hoop nets, minnow traps, electrofisher, beach seine, and rod and reel. We caught no larval sturgeon or burbot, and we caught no YOY sturgeon. One YOY burbot was captured in the lower Kootenai River in a baited minnow trap. We also caught 33 older juvenile sturgeon in small mesh gill nets, of which all but two were thought to be of hatchery origin. The minimum length captured in the gill nets was 35 cm total length (age 3+ to age 4+), which indicated that there were no sturgeon smaller than this in the system, or they are not recruited to the gill nets until they reach this length. The lack of success in sampling YOY sturgeon is not encouraging, and may be further evidence that sturgeon spawning is leading to very few juveniles. Although the methods we used have been proven effective in other systems, it is possible they are ineffective in the Kootenai system. We believe the gill nets can be used to effectively estimate the abundance of age 3+ and age 4+ sturgeon, and the flow tests can only be fully evaluated 3 to 4 years following the test, when recruits from flow test year classes are 30 to 40 cm. ... recruitment ... Actions: Add to Cart
13. Determination of fishery losses in the Flathead system resulting from the construction of Hungry Horse Dam by Zubik, Raymond J. Publication: Portland, OR BPA 1987 . 1 v. (various pagings) , 85080 28 cm. Date:1987 Availability: Copies available: StreamNet Library [SH 173 .Z83 1986] (1), Match: ... EXEC. SUMMARY (SN 85080) : This study is part of the Northwest Power Planning Council's resident fish and wildlife plan, which is responsible for mitigating damages to fish and wildlife resources caused by hydroelectric development in the Columbia River basin. The major goal of this study was to provide estimates of fishery losses to the Flathead system as a result of the completion of Hungry Horse Dam and to propose mitigation alternatives for enhancing the fishery. ... Based on population estimates from the river above HHR, we calculated that potential habitat for about 12,000 juvenile cutthroat was lost when the South Fork Flathead River was inundated. These fish were also adfluvials destined for Flathead Lake. Access to tributary habitat that would support approximately 165,500 adfluvial cutthroat juveniles was lsot in the upper South Fork when the dam was completed. Based on migration rates for the Kootenai system, we calculated that about 65,500 adfluvial juvenile cutthroat were lost to Flathead Lake annually from the river and tributary system. Based on spawning gravel surveys and spawner escapement estimates from Hungry Horse Creek, potential recruitment of about 2,350 cutthroat juveniles were lost to the reservoir population if all problem road culverts identified were complete migration barriers. ... By comparing spawning escapement estimates and drainage areas for the North and Middle Forks of the Flathead River, potential habitat for about 2,100 adult bull trout was lost to Flathead Lake annually from blocked access to the South Fork due to dam construction. ... Actions: Add to Cart
14. ... Willamette River spring Chinook salmon run, fisheries, and passage at Willamette Falls   Publication: Portland, OR ODFW 1975 . v. 28 cm. Date:1975 Availability: Copies available: StreamNet Library [SH 222 .O7 W5661] (17), Match: ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
15. Blackfoot River fisheries investigations | Biochemical genetic analysis of cutthroat trout by Thurow, Russell Publication: Boise, ID IDFG 1981 . 243 p. 28 cm. Date:1981 Availability: Copies available: StreamNet Library [SH 222 .I2 B533 1978/81] (1), Match: ... In 1978 the Idaho Department of Fish and Game initiated an intensive fishery investigation on the Blackfoot River drainage. We designed the project to aid in the development of a management plan for the drainage and to provide baseline data to assess the impacts of present and future land usage, particularly phosphate mining. We collected information on the principal cutthroat trout (Salmo clarki bouvieri) spawning and rearing areas, enumerated adult escapements and juvenile recruitment and emigration, characterized movement patterns, and evaluated the relative abundance, density, distribution, species composition and age and growth of fish. We also conducted a comprehensive creel census on Blackfoot Reservoir in 1979 and the Blackfoot River and tributaries in 1978. We surveyed limnological characteristics of Blackfoot Reservoir and assessed salmonid food habits. Habitat quality parameters were surveyed on principal upper valley tributaries. ... Upper valley tributaries function as principal spawning and rearing areas for wild cutthroat trout. Surveys indicate that tributaries currently support fewer spawners than they did in 1959. A portion of the spawners survive and return to spawn in consecutive or alternate years. ... Actions: Add to Cart
16. Blackfoot River fisheries investigations by Thurow, Russ Publication: Boise, ID IDFG 1981 . ix, 139 p. 28 cm. Date:1981 Availability: Copies available: StreamNet Library [SH 222 .I2 B533 1979/80] (1), Match: ... Job I: Fish distribution and abundance in the Blackfoot River drainage. -- Job II: Spawning and rearing characteristics and movements of Blackfoot River cutthroat stocks. -- Job III: Estimates of angler use, harvest and opinions in the Blackfoot River drainage. -- Job IV: Limnological studies in Blackfoot Reservoir. ... A portion of the cutthroat which spawn in upper valley tributaries survive and spawn in consecutive years. Tributaries currently support fewer spawners than they did in 1959. Juvenile cutthroat (< 250 mm, 9.8 in) were much more abundant in the Blackfoot River and tributaries in 1979 than in 1978. Better recruitment in 1978 versus 1977 may account for the differences in juvenile densities. ... Actions: Add to Cart
17. Evaluation of delisting criteria and rebuilding schedules for Snake River spring/summer Chinook, fall Chinook and sockeye salmon by Cramer, Steven P. Publication: Portland, OR BPA 1993 . 1 v. (various pagings) , 29109 28 cm. Date:1993 Availability: Copies available: StreamNet Library [SH 327.7 .C65 R33 1993 v.10] (1), Match: ... population estimates ... recruitment ... Spawner ... Actions: Add to Cart
18. 1975 Willamette River spring Chinook salmon run by Collins, Melvin D. Publication: Portland, OR ODFW 1976 . 32 p. ; 28 cm. , 60013 28 cm. Date:1976 Availability: Copies available: StreamNet Library [SH 222 .O7 W5661 1975] (1), Match: ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
19. 1984 Willamette River spring Chinook salmon run by Bennett, Donald E. Publication: Portland, OR ODFW 1985 . 36, 6 p. , 60115 28 cm. Date:1985 Availability: Copies available: StreamNet Library [SH 222 .O7 W5661 1984] (1), Match: ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
20. 1999 Willamette River spring Chinook salmon run, fisheries, and passage at Willamette Falls by Foster, Craig A. Publication: Portland, OR ODFW 2000 . 1 v. , 50118 28 cm. Date:2000 Availability: No items available: Match: ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
21. Studies of hatchery and wild steelhead in the lower Columbia region by Leider, Steven A. Publication: Olympia, WA WDW 1987 . x, 130 p. , 266 28 cm. Date:1987 Availability: Copies available: StreamNet Library [QL 639.16 .S7841 1987] (1), Match: ... 13) A study was initiated to determine whether the use of wild steelhead as a source of broodstock for hatchery programs was feasible and cost effective. Limited availability of Kalama and Washougal River spawners, compounded by the occurrence of IHN in egg test lots, necessitated termination of this work. Information obtained is discussed and recommendations for future wild broodstock studies are presented. ... 14) Methods for estimating Kalama River steelhead spawner escapement, harvest, total run size, spawner-recruit relationships, and hatchery vs. wild smolt-to-adult survival databases were refined and presented in detail. ... spawner-recruit ... Actions: Add to Cart
22. Snake River sockeye salmon habitat and limnological research by Taki, Doug Publication: Portland, OR BPA 1997 . iv, 83 p. , 29672 28 cm. Date:1997 Availability: Copies available: StreamNet Library [QL 638 .S28 S63 1996] (1), Match: ... During 1996 we assessed fish densities using hydroacoustic sampling in Redfish, Pettit, and Alturas lakes. Hydroacoustic estimates of O. nerka densities in 1996 ranged from 61 to 480 fish/ha, and biomass ranged from 0.97 kg/ha in Alturas Lake to 36.23 kg/ha in Pettit Lake. Density was greatest in Pettit Lake followed by Redfish and Alturas lakes. Adult O. nerka escapement was 10,622 in Fishhook Creek, 825 in Stanley Lake Creek, and 744 in Alturas Lake Creek. ... A picket weir was installed in Fishhook Creek to enumerate spawners and allow only 2,000 females to pass in an attempt to limit recruitment to the lake in 1997. The weir was operated from 8 August through 28 August. We checked the weir one to two times daily depending on the number of fish entering the stream. Unfortunately, the weir did not operate efficiently and we were not able to limit the number of spawners as planned. ... population estimates ... Spawner ... Actions: Add to Cart
23. 1989 Willamette River spring Chinook salmon run, fisheries, and passage at Willamette Falls by Bennett, Donald E. Publication: Portland, OR ODFW 1990 . 35, 33, 6 p. , 51 28 cm. Date:1990 Availability: Copies available: StreamNet Library [SH 222 .O7 W5661 1989] (1), Match: ... The third section, Lower Willamette and Clackamas River Steelhead and Willamette River White Sturgeon and Shad, furnishes supplementary adjunctive infomration on four other fisheries that occur during, or in close proximity to the spring chinook fishery. Lower Willamette recreational catch and effort estimates for shad began in 1976; steelhead and white sturgeon in 1978; and the lower Clackamas River in 1979. ... INTRODUCTION: A variety of recreational fishing opportuniteis are available throughout each year in the lower Willamette River from the falls at Oregon City to the mouth at Kelley Point, in Multnomah Channel above St. Helens, and in the Clackamas River from the mouth to River Mill Dam. However, the majority of angling effort occurs during a 4-month period, February-May, when sportsmen expend about 200,000 angler days annually in pursuit of Willamette and Clackamas spring chinook. The Department of Fish and Wildlife conducts an intensive sampling program each year to estimate the spring chinook angling effort and catch. In recent years angling effort and catch estimates of Clackamas steelhead, as well as Willamette steelhead, white sturgeon, and shad, were obtained during the spring chinook sampling program. Estimates were continued into late June or early July for the upper Willamette River section to obtain data on the shad fishery. ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
24. 1990 Willamette River spring Chinook salmon run, fisheries, and passage at Willamette Falls by Bennett, Donald E. Publication: Portland, OR ODFW 1991 . 42, 33, 6 p. , 52 28 cm. Date:1991 Availability: Copies available: StreamNet Library [SH 222 .O7 W5661 1990] (1), Match: ... The third section, "1990 Lower Willamette and Clackamas River Steelhead and Willamette River White Sturgeon and Shad Recreational Fisheries," furnishes supplementary adjunctive information on four other fisheries that occur during, or in close proximity to the spring chinook fishery. Lower Willamette recreational catch and effort estimates for shad begin in 1976 and steelhead and white sturgeon in 1978. Lower Clackamas River recreational catch and effort estimates for steelhead began in 1979. ... catch estimates ... run estimates ... recruitment ... Spawner ... Actions: Add to Cart
25. Status of upper Columbia and Snake River summer chinook salmon in relation to the Endangered Species Act by Horner, Ned Publication: Moscow, ID USFWS 1981 . 1 v. in various pagings , 60227 28 cm. Date:1981 Availability: Copies available: StreamNet Library [QL 638 .S7 S72 1981 no.2] (1), Match: ... population estimates ... stock-recruitment ... Spawner ... Actions: Add to Cart
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