Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon PDF full book. Access full book title Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon by John E. Clark. Download full books in PDF and EPUB format.
Author: John E. Clark
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 71
Get Book Here
Book Description
"Quantitatively contrast[s] test fishery catches on days of no commercial effort with test fishery catches during commercial openings"--P. 2.
Author: John E. Clark
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 71
Get Book Here
Book Description
"Quantitatively contrast[s] test fishery catches on days of no commercial effort with test fishery catches during commercial openings"--P. 2.
Author: Linda K. Brannian
Publisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 40
Get Book Here
Book Description
Report on estimates of total abundance (total run size), exploitation rate (maximum sustainable exploitation rate), and migration timing (lower and middle runs, Alaska and upper runs, Canadian origin) of chinook salmon (Oncorhynchus tschawytscha Walbaum) in the Yukon river, Alaska between 1982 and 1986.
Author: Jack M. Van Hyning
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 848
Get Book Here
Book Description
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.
Author: Ted R. Spencer
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 54
Get Book Here
Book Description
The goal of this multi-year (1999-2002) cooperative study between the Alaska Department of Fish and Game and the National Marine Fisheries Service was to determine the migratory characteristics and escapement distribution of Yukon River chinook salmon. Primary objectives in 2000 and 2001 were to assess and refine fish capture and radio-tracking methods for a full-scale program in 2002, and to estimate drainage-wide population size using mark-recapture techniques.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
Get Book Here
Book Description
Fisheries & Oceans Canada has conducted mark-recapture studies on adult Yukon River chinook salmon since 1982. In some of these studies, up to 2,174 upstream migrants were spaghetti tagged annually at two fishwheels located just upstream from the Canada/US border. Recaptures were made in a commercial fishery upstream. This report presents results from the chinook mark-recapture program for 1990 to 1995. Background on the Yukon River, its chinook population & fishery, and mark-recapture & data analysis methods begins the report. Results are presented with regard to the biological characteristics of salmon captured, abundance estimates using three estimation methods, fishery catches & spawning escapement, harvest rates, and migration rates. The final section discusses problems with respect to the abundance estimators used and makes recommendations for further research.
Author: John Edward Clark
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 310
Get Book Here
Book Description
Author: Shane M. Eaton
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 108
Get Book Here
Book Description
Biological data were collected from Chinook (Oncorhynchus tshawytscha), summer chum (O. keta), fall chum (O. keta), and coho (O. kisutch) salmon at 19 locations along the U.S. portion of the Yukon River drainage in 2014. Age, sex, and length (ASL) data were obtained from 2,969 Chinook, 4,637 summer chum, 3,120 fall chum, and 1,654 coho salmon from commercial and subsistence harvests, as well as test fisheries and escapement projects. Samples were collected from salmon caught with gillnets, dip nets, fish wheels, beach seines, weir traps, and from hand-picked carcass. Where available, escapement estimates from weir projects were separated into temporal segments (strata) and commercial harvests were separated by fishing periods. The ASL data collected during the corresponding stratum or period was applied to the corresponding escapement estimate or commercial harvest to generate estimates of proportions and numbers by age and sex. At test fishery projects ASL data were stratified into quartiles based on catch per unit effort (CPUE), commercial period, or mesh size. In 2014, age-1.3 Chinook salmon predominated from all of the test fishery and escapement projects; and most of the subsistence harvest samples. At many long standing projects 5-year-old (age-1.3 and age-2.2) Chinook salmon percentages were above the long-term and 5-year averages, whereas the 4-year-old (age-1.2 and age-2.1) and 6-year-old (age-1.4 and age-2.3) percentages were near or below the long-term and 5-year averages. Both summer and fall chum salmon samples were primarily composed of age-0.3 and age-0.4 fish. Age-2.1 coho salmon predominated in the commercial and test fishery samples.
Author:
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 60
Get Book Here
Book Description
Author: Yukon River Joint Technical Committee
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 169
Get Book Here
Book Description
The Yukon River Joint Technical Committee (JTC) of the United States and Canada meets twice a year to analyze and discuss harvest and escapement goals, management trends, postseason reviews, preseason outlooks, and results of cooperative research projects for Canadian-origin Yukon River salmon. This report summarizes the status of Chinook Oncorhynchus tshawytscha, coho O. kisutch, and summer and fall chum salmon O. keta stocks in 2019, presents a 2020 season outlook, and provides data about salmon harvests in commercial, subsistence, aboriginal, personal use, domestic, and sport or recreational fisheries. Summaries of Yukon River research projects are also included. For 2019, the preliminary estimate of Chinook salmon (mainstem) spawning escapement into Canada was 42,052 fish, just below the lower end of the interim management escapement goal (IMEG) range of 42,500-55,000 fish. A preliminary estimate of the total Canadian-origin Chinook salmon run was 72,620 fish. The preliminary estimate of fall chum salmon spawning escapement in the Canadian mainstem Yukon River was approximately 99,738 fish, near the upper end of the IMEG range of 70,000-104,000 fish. The preliminary estimate of fall chum salmon spawning escapement in the Fishing Branch River (Porcupine River), obtained from a weir count, was 18,171 fish and below the IMEG range of 22,000-49,000 fish. Recommended interim management escapement goals for Canadian-origin mainstem Yukon River Chinook and fall chum salmon and Fishing Branch (Porcupine River) fall chum salmon in 2020 remain the same as for 2019.
Author: Adam M. Reimer
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 68
Get Book Here
Book Description
The migratory timing and distribution of Kenai River chinook salmon was examined using radio telemetry for early-run and late-run chinook salmon during the 2010-2013 seasons.
