Stock Assessment and Evaluation of the Arctic Grayling Fishery in the Mainstem Gulkana River, 2017 PDF Download
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Author: Andrew D. Gryska Publisher: ISBN: Category : Arctic grayling Languages : en Pages : 42
Book Description
The Gulkana River, located along the Richardson Highway near Glennallen, Alaska, supports the largest Arctic grayling (Thymallus arcticus) fishery in the Upper Copper Upper Susitna Management Area. Most of the fishing effort and harvest occurs in a 75 km section of the mainstem river between Paxson Lake and Sourdough Creek. From 1989 until present, the Arctic grayling daily bag limit downstream of Paxon Lake has been 5 fish, only one of which can be over 14 inches. To evaluate the effectiveness of this regulation, a stock assessment was performed for the Arctic grayling population inhabiting the 75 km section in July and August 2017. Mark-recapture techniques were used to estimate abundance and length composition of the population. Using hook and line gear, a total of 3,002 Arctic grayling ≥240 mm fork length (FL) were captured; however, too few fish were recaptured (m2 = 6) to estimate abundance without bias. Data collected during this study was compared to previous stock assessments, and it was concluded that the mainstem Gulkana River does not support substantial numbers of large Arctic grayling during the summer. Given the composition of the population (numerous Arctic grayling
Author: Andrew D. Gryska Publisher: ISBN: Category : Arctic grayling Languages : en Pages : 42
Book Description
The Gulkana River, located along the Richardson Highway near Glennallen, Alaska, supports the largest Arctic grayling (Thymallus arcticus) fishery in the Upper Copper Upper Susitna Management Area. Most of the fishing effort and harvest occurs in a 75 km section of the mainstem river between Paxson Lake and Sourdough Creek. From 1989 until present, the Arctic grayling daily bag limit downstream of Paxon Lake has been 5 fish, only one of which can be over 14 inches. To evaluate the effectiveness of this regulation, a stock assessment was performed for the Arctic grayling population inhabiting the 75 km section in July and August 2017. Mark-recapture techniques were used to estimate abundance and length composition of the population. Using hook and line gear, a total of 3,002 Arctic grayling ≥240 mm fork length (FL) were captured; however, too few fish were recaptured (m2 = 6) to estimate abundance without bias. Data collected during this study was compared to previous stock assessments, and it was concluded that the mainstem Gulkana River does not support substantial numbers of large Arctic grayling during the summer. Given the composition of the population (numerous Arctic grayling
Author: Kevin L. Pope Publisher: CRC Press ISBN: 1000389227 Category : Nature Languages : en Pages : 483
Book Description
Harvest of Fish and Wildlife: New Paradigms for Sustainable Management unites experts in wildlife and fishery sciences for an interdisciplinary overview of harvest management. This book presents unique insights for embracing the complete social-ecological system to ensure a sustainable future. It educates users on evolutionary and population dynamics; social and political influences; hunter and angler behavior; decision processes; impacts of regulations; and stakeholder involvement. Features: Written by twenty-four teams of leading scientists and managers. Promotes transparent justification for fishing and hunting regulations. Provides examples for integrating decision making into management. Emphasizes creativity in management by integrating art and science. This book appeals to population biologists, evolutionary biologists and social scientists. It is a key resource for on-the-ground managers and research scientists developing harvesting applications. As the book’s contributors explain: “Making decisions that are robust to uncertainty...is a paradigm shift with a lot of potential to improve outcomes for fish and wildlife populations.” –Andrew Tyre and Brigitte Tenhumberg “Temporal shifts in system states...must somehow be anticipated and dealt with to derive harvest policies that remain optimal in the long term.” –Michael Conroy “Proactive, effective management of sportspersons...will be essential in the new paradigm of harvest management.” –Matthew Gruntorad and Christopher Chizinski
Author: Douglas S. Vincent-Lang Publisher: ISBN: Category : Arctic grayling Languages : en Pages : 59
Book Description
Estimates of stocks of Arctic grayling (Thymallus arcticus) available for sport fishing in the Gulkana River in southeast Alaska, and details of migration.
Author: Corey J. Schwanke Publisher: ISBN: Category : Arctic grayling Languages : en Pages : 35
Book Description
A 2-event mark–recapture study was conducted to estimate the abundance of Arctic grayling in a 9-river kilometer (RKM) reach of Lower Hungry Hollow Creek and Middle Fork Gulkana River in 2019. Intensive hook and line sampling occurred 18–22 July for the first event and 26–29 July for the second event. A total of 2,469 Arctic grayling ≥270 mm fork length (FL) were captured and marked during the first event and 2,270 were captured and examined during the second event, 204 of which were marked during the first event. A length-stratified Bailey estimator was used to estimate the abundance of Arctic grayling ≥270 mm FL in the 9-RKM study area and, because of uncertainty associated with movement at the lower end of this area, in a truncated portion of the study area encompassing only the lower 6-RKM of Hungry Hollow Creek. The estimated abundance of Arctic graying ≥270 mm FL was 40,952 (95% CI = 29,732–52,732) in the 9-RKM study area and 28,894 (95% CI = 17,975–39,813) in the 6-RKM area. Because precision requirements for these estimates were not met due to low capture probabilities for fish 270–289 mm FL, abundance was also more precisely estimated for Arctic grayling ≥290 mm FL. The estimated abundances of Arctic grayling ≥290 mm FL in the 9-RKM and 6-RKM study areas were 16,356 (95% CI = 14,050–18,663) and 10,416 (95% CI = 8,774–12,058) fish, respectively. Individual length strata abundance estimates are presented in this report. Length compositions for Arctic grayling ≥270 mm FL were very similar in both study areas, with fish 270–289 mm accounting for >60% of the estimated population, whereas larger fish (i.e., fish ≥320 mm FL) accounted for
Author: Albert Goodwill Spalding Publisher: ISBN: Category : Baseball Languages : en Pages : 586
Book Description
This book is Albert Spaldings work of "historic facts concerning the beginning, evolution, development and popularity of base ball, with personal reminiscences of its vicissitudes, its victories and its votaries." It is one of the defining books in the early formative years of modern baseball.
Author: Andrew D. Gryska
Author: Andrew D. Gryska
Author: James T. Fish
Author: Kevin L. Pope
Author: United States
Author: Douglas S. Vincent-Lang
Author: 
Author: Corey J. Schwanke
Author: Robert A. Clark
Author: Robert A. Clark
Author: Albert Goodwill Spalding