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Fall Chinook Salmon
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Book Synopsis Fall Chinook Salmon Returns to Hatcheries in the Bonneville Dam Pool Area, 1945-60 by : Eugene M. Maltzeff
Download or read book Fall Chinook Salmon Returns to Hatcheries in the Bonneville Dam Pool Area, 1945-60 written by Eugene M. Maltzeff and published by . This book was released on 1963 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Factors Influencing the Return of Fall Chinook Salmon (Oncorhynchus Tshawytscha) to Spring Creek Hatchery by : Charles O. Junge
Download or read book Factors Influencing the Return of Fall Chinook Salmon (Oncorhynchus Tshawytscha) to Spring Creek Hatchery written by Charles O. Junge and published by . This book was released on 1963 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predation by Sculpins on Fall Chinook Salmon, Oncorhynchus Tshawytscha, Fry of Hatchery Origin by : Benjamin G. Patten
Download or read book Predation by Sculpins on Fall Chinook Salmon, Oncorhynchus Tshawytscha, Fry of Hatchery Origin written by Benjamin G. Patten and published by . This book was released on 1971 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fall Chinook Salmon in the Deschutes River, Oregon by : Brian C. Jonasson
Download or read book Fall Chinook Salmon in the Deschutes River, Oregon written by Brian C. Jonasson and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Life History of Fall Chinook Salmon in Elk River, 1964-69 by : Reese E. Bender
Download or read book Life History of Fall Chinook Salmon in Elk River, 1964-69 written by Reese E. Bender and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Floodplains by : Jeffrey J. Opperman
Download or read book Floodplains written by Jeffrey J. Opperman and published by Univ of California Press. This book was released on 2017-09-05 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to temperate floodplains -- Hydrology -- Floodplain and geomorphology -- Biogeochemistry -- Ecology: introduction -- Floodplain forests -- Primary and secondary production -- Fish and other vertebrates -- Ecosystem services and floodplain reconciliation -- Floodplains as green infrastructure -- Case studies of floodplain management and reconciliation -- Central Valley floodplains: introduction and history -- Central Valley floodplains today -- Reconciling Central Valley floodplains -- Conclusions: managing temperate floodplains for multiple benefits
Book Synopsis Fall Chinook Salmon Spawning in the Columbia River Near Hanford 1947-1969 by : D. G. Watson
Download or read book Fall Chinook Salmon Spawning in the Columbia River Near Hanford 1947-1969 written by D. G. Watson and published by . This book was released on 1970 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fall Chinook (Oncorhynchus Tshawytscha) by : Jim Waldvogel
Download or read book Fall Chinook (Oncorhynchus Tshawytscha) written by Jim Waldvogel and published by . This book was released on 2006 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Age analysis for 22 years (1980 excluded) showed that the overall percentages for female spawners was 53% (4-year olds), 38% (3-year olds), and 9% (5-year olds). The age composition of male spawners showed a high degree of variability throughout the study. Male chinook of age 2, 3 and 4 were dominant annually, but 5- and 6- year old fish were present in most spawning seasons. All chinook carcasses from which scales were collected were also measured for length (over 120 samples in 22 years). Decreases in mean length were documented for all age classes for each of the El Nino episodes that occurred during the study (1982-1984; 1992-1993; 1997-1998). The decreases in mean length appeared to carry forward for each cohort's age class. The total number of chinook redds was tabulated by counting "fresh" redds during weekly spawning surveys. The mean number of redds was 117 for the 23-year period with a mean of 0.9 redds per adult salmon or 1.8 redds per female.
Book Synopsis Effect of Size and Time of Release of Fall Chinook Salmon Fingerlings on Adult Survival by : L. G. Fowler
Download or read book Effect of Size and Time of Release of Fall Chinook Salmon Fingerlings on Adult Survival written by L. G. Fowler and published by . This book was released on 1980* with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lower Umpqua River Basin Fall Chinook Salmon Program by :
Download or read book Lower Umpqua River Basin Fall Chinook Salmon Program written by and published by . This book was released on 2017 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Fall Chinook Salmon in Elk River by : Paul E. Reimers
Download or read book Studies of Fall Chinook Salmon in Elk River written by Paul E. Reimers and published by . This book was released on 1980* with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fecundity of Fall Chinook Salmon in Sixes River, Oregon by : Paul E. Reimers
Download or read book Fecundity of Fall Chinook Salmon in Sixes River, Oregon written by Paul E. Reimers and published by . This book was released on 1975 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Something Spectacular by : Howard A. Tanner
Download or read book Something Spectacular written by Howard A. Tanner and published by MSU Press. This book was released on 2018-12-01 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the new chief of the Michigan Department of Conservation’s Fish Division in 1964, Howard A. Tanner was challenged to “do something . . . spectacular.” He met that challenge by leading the successful introduction of coho salmon into the Michigan waters of the Great Lakes. This volume illustrates how Tanner was able to accomplish this feat: from a detailed account of his personal and professional background that provided a foundation for success; the historical and contemporary context in which the Fish Division undertook this bold step to reorient the state’s fishery from commercial to sport; the challenges, such as resistance from existing government institutions and finding funding, that he and his colleagues faced; the risks they took by introducing a nonnative species; the surprises they experienced in the first season’s catch; to, finally, the success they achieved in establishing a world-renowned, biologically and financially beneficial sport fishery in the Great Lakes. Tanner provides an engaging history of successfully introducing Pacific salmon into the lakes from the perspective of an ultimate insider.
Book Synopsis Elk River Fall Chinook Salmon Program by :
Download or read book Elk River Fall Chinook Salmon Program written by and published by . This book was released on 2016 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Abundances of Rogue River Fall Chinook Salmon by : S. P. Cramer
Download or read book Abundances of Rogue River Fall Chinook Salmon written by S. P. Cramer and published by . This book was released on 1987 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fall Chinook Salmon Skin Color and Adipose Fin Mark Observations at Bonneville Dam, ... by :
Download or read book Fall Chinook Salmon Skin Color and Adipose Fin Mark Observations at Bonneville Dam, ... written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Factors Affecting the Abundance of Fall Chinook Salmon in the Columbia River by : Jack M. Van Hyning
Download or read book Factors Affecting the Abundance of Fall Chinook Salmon in the Columbia River written by Jack M. Van Hyning and published by . This book was released on 1968 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the population ecology of Columbia River fall chinook salmon, Oncorhynchus tshawytscha (Walbaum), was made in an attempt to determine the cause of a serious decline in this run which occurred in the early 1950's. Fluctuations in abundance of major salmon runs the North Pacific were examined to detect any coastwide pattern. Only chinook salmon in Cook Inlet, Alaska, and chum salmon from Oregon to southwestern Alaska showed a similar trend. The following life history stages broken down into pre- and post-decline years were examined: (1) marine life including distribution and migration, growth and maturity, survival rate, oceanography, and commercial and sport fisheries; (2) upstream migration including river fisheries, gear selectivity, size and age composition of the run, escapement, and influence of dams, diseases, and water quality; (3) reproduction and incubation including spawning areas and spawning and incubation conditions; and (4) downstream migration which included predation, dams and reservoirs, diseases, flow, turbidity and temperature, and estuary life. Salient points of the analysis were: (1) a change in the maturity and survival pattern based on tagged and fin-clipped fish recovered before and after 1950; (2) a significant negative correlation between sea-water temperature during a year class' first year at sea and subsequent survival; (3) a large increase in the ocean fisheries coincident with the decline in the run; (4) catch-effort statistics of the ocean fishery show a near classic example of the effect of overexploitation; (5) estimates of the contribution of Columbia River chinook to the ocean fisheries based on tag recoveries could be underestimates rather than overestimates; (6) a significant inverse correlation between estimated ocean catch of Columbia River fall chinook and numbers entering the river; (7) size and age composition of the ocean and river catches decreased coincident with the decline in the run; (8) the gill-net fishery shows little size selectivity by age, size, or sex in the dominant group; (9) fluctuations in abundance of hatchery stocks are related to differences in survival between fingerling and adult; (10) hatchery, lower river, and upriver populations fluctuate in abundance in much the same pattern; (11) optimum escapement is between 90,000 and 100,000 adults, a value that was exceeded during most years; (12) a highly significant negative correlation between numbers of spawners and return per spawner; (13) most of the early dams had no direct effect on fall chinook and the decline in productivity occurred when river conditions were relatively stable; (14) temperatures at time of migration and spawning for fall chinook have not increased enough to be a serious mortality factor; (15) little relationship between flow, turbidity, and temperature at time of downstream migration and subsequent return was evident except that high temperatures and high flows (and turbidities) tended to produce poorer runs during certain time periods; and (16) predation and delay of smolts in reservoirs are largely unknown factors, but circumstantial evidence suggests that they were not important in regulating fall chinook numbers during the period of the study. Finally, variables that appeared to bear some relationship to fluctuations in abundance of fall chinook were submitted to multiple regression analysis. For the predecline period (1938-46 brood years), sea-water temperature and ocean troll fishing effort were significant variables (R2 = 0.74). For post decline years (1947-59 broods), troll had the most influence on total return with ocean temperature and escapement having lesser effects. For the combined years, troll intensity and ocean temperature were the significant variables (R2 = 0.572). Entering interaction of river flow at downstream migration with the other variables brought R2 to 0.754 which means that 75% of the variability in the returning run could be accounted for by these three factors. Return per spawner was so heavily influenced by numbers of spawners that the other factors assumed negligible importance. Equations were derived that predicted the returning run in close agreement with the actual run size. Substituting a low and constant troll fishing effort in the equation resulted in the predicted run maintaining the average predecline level. The increase in ocean fishing was the main contributor to the decline of the Columbia River fall chinook run as shown by correlation, by analogy, and by the process of elimination. To demonstrate why other chinook runs have not shown similar declines, it was shown that due to several unique features in Columbia River fall chinook life history they are exposed to much more ocean fishing than other populations. It was emphasized that these conclusions should not be extrapolated to the future or to other species or runs of salmon.