Assessment of Walleye (Stizostedion Vitreum Vitreum) Abundance, Movements, and Growth in Lake Roosevelt, Washington PDF Download
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Author: Jason G. McLellan
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 232
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"The purpose of this project was to determine the status of the walleye population in Lake Roosevelt, Washington. The objectives were to: 1) estimate the size of the walleye population via a mark-recapture study, 2) determine movements and growth of walleye in Lake Roosevelt, marked with floy tags, via angler returns and biologist recaptures, 3) Calculate age, growth, condition, and mortality of the walleye from scale samples and catch data, and 4) estimate young-of-the-year (YOY) walleye abundance in the Spokane River Arm of Lake Roosevelt. All walleye>̲ 150 mm total length (TL) were tagged with individually numbered floy tags, during five passes through the reservoir. The passes occurred between April 17 and December 17, 1997. Scale samples were taken from all size classes of walleye. Four estimates of walleye abundance were calculated. The Schnabel model (± 95% confidence interval), CAPTURE model (± 95% confidence interval), and Jolly-Seber model (± 95% confidence interval), estimates were 64,641 (50,116 ̲ N
Author: Jason G. McLellan
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 232
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Book Description
"The purpose of this project was to determine the status of the walleye population in Lake Roosevelt, Washington. The objectives were to: 1) estimate the size of the walleye population via a mark-recapture study, 2) determine movements and growth of walleye in Lake Roosevelt, marked with floy tags, via angler returns and biologist recaptures, 3) Calculate age, growth, condition, and mortality of the walleye from scale samples and catch data, and 4) estimate young-of-the-year (YOY) walleye abundance in the Spokane River Arm of Lake Roosevelt. All walleye>̲ 150 mm total length (TL) were tagged with individually numbered floy tags, during five passes through the reservoir. The passes occurred between April 17 and December 17, 1997. Scale samples were taken from all size classes of walleye. Four estimates of walleye abundance were calculated. The Schnabel model (± 95% confidence interval), CAPTURE model (± 95% confidence interval), and Jolly-Seber model (± 95% confidence interval), estimates were 64,641 (50,116 ̲ N
Author:
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Category :
Languages : en
Pages : 44
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Walleye (Stizostedion vitreum) have been marked with floy tags in Lake Roosevelt since 1997 to estimate abundance, distribution and movement trends. In 2000, walleye were collected and marked during the spawning run in the Spokane River through electrofishing and angling to supplement movement and growth data collected in previous years. Walleye were also collected and marked during the 2000 and 2001 Kettle Falls Governor's Cup Walleye Tournaments. Seventy-six tag returns were recovered in 2000 and twenty-three in 2001. Walleye migrated into the Spokane River to spawn in mid April and early May. The majority of marked walleye were recovered within 25 km of their original marking location, with a few traveling long distances between recovery locations. Data also verified earlier results that walleye establish summer home ranges. Some walleye remained in the Spokane River, while others moved downstream, or upstream after entering the mainstem of Lake Roosevelt. Those moving upstream moved as far north as Keenlyside Dam in British Columbia (245 km). Growth data indicated similar trends exhibited in the past. Walleye growth and mortality rates were consistent with other walleye producing waters. Walleye condition was slightly below average when compared to other systems.
Author: David Henry Bennett
Publisher:
ISBN:
Category : Walleye
Languages : en
Pages : 58
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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A walleye mark-recapture study was conducted on Lake Roosevelt between 1997 and 1999. The primary objective of the study was to describe the status and biological characteristics of the walleye population in Lake Roosevelt by determining its abundance, movement patterns, age structure, growth, condition, and mortality. The abundance estimates were also to be used to estimate the consumptive impact of walleye on stocked kokanee and rainbow trout. Walleye were collected by electrofishing and angling. Each walleye was tagged with an individually numbered Floy tag. The Jolly-Seber model was used to estimate the size of the walleye population in 1999, using each year of the study as a mark-recapture occasion. Mark-recapture data collected in 1998 was re-analyzed in 1999 with the data pooled in various combinations, using closed and open population models, in an attempt to provide an estimate of walleye abundance that was unbiased, accurate, and more precise. Minimum distances traveled between mark and recapture location by tagged walleye were determined from tag returns. Over the three study years, a total of 12,343 walleye ≥ 150 mm TL were collected by Eastern Washington University (EWU), Spokane Tribe of Indians, and Washington Department of Fish and Wildlife, and of those, 10,770 were tagged and released. Of the 10,770 walleye marked and released, 775 were recaptured and returned to EWU. The 1999 abundance estimate (± standard error) for walleye ≥ 150 mm TL was 129,183 (± 45,578) and the estimated abundance (± standard error) of walleye ≥ 200 mm TL was 101,508 (± 35,603). A total of 38 population estimates were calculated for 1998. The estimates of the abundance of walleye ≥ 150 mm TL in Lake Roosevelt ranged from 84,335 to 180,568 fish. Estimates of the size of the walleye population ≥ 200 mm TL ranged from 14,971 to 173,702. The 1999 estimate, which used each study year as a mark-recapture occasion, was biased due to unequal capture probabilities. If biases were eliminated, the annual sampling strategy may be the most cost-effective. Of the reanalyzed 1998 estimates, the Schnabel corrected for tag loss and recruitment and the Jolly-Seber estimate, both calculated with the 200 mm minimum length, were recommended for modeling walleye consumption. Minimum distances traveled between mark and recapture location by tagged walleye marked on the spawning run ranged from 0 to 245 km over a range of 11 to 486 days. Minimum distances traveled between mark and recapture location by tagged walleye marked during the summer/fall ranged from 0 to 217 km over a range of 8 to 788 days. Walleye exhibited seasonal movement trends that included a migration to the spawning area in the upper Spokane River Arm in the spring, with peak spawning occurring in April and May, and a migration following spawning to summer habitats. Once at the summer habitat, walleye appeared to establish summer home ranges (SHR). Walleye collected in Lake Roosevelt in 1999 ranged in age from 0 to 8. Mean instantaneous and mean annual mortality were estimated at 0.62% and 46%. Mean condition factor (K{sub TL}) of the 343 walleye measured and weighed in 1999 was 0.83 (SD = 0.13). Walleye mortality rates appeared to be relatively stable. Mortality and growth were average when compared to other walleye producing waters. Walleye condition was low when compared to condition factors in 1980-83, 1988, 1989, and 1990. The K{sub TL}'s of walleye from Lake Roosevelt were slightly below average when compared to other walleye populations.
Author: Michael Dane Staggs
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 338
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Author: Gregory George Sass
Publisher:
ISBN:
Category :
Languages : en
Pages : 258
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Author: Huiyu Wang
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ISBN:
Category : Erie, Lake
Languages : en
Pages : 122
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 492
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"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author: Michael John Cyterski
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Holly J. McLellan
Publisher:
ISBN:
Category : Franklin D. Roosevelt Lake (Wash.)
Languages : en
Pages : 41
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