Run Reconstruction, Spawner-recruit Analysis, and Escapement Goal Recommendation for Summer Chum Salmon in the East Fork of the Andreafsky River PDF Download
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Author: Steven J. Fleischman Publisher: ISBN: Category : Chum salmon Languages : en Pages : 37
Book Description
Historical abundance of Andreafsky River, Anvik River, and aggregated other upriver stocks of summer chum salmon Oncorhynchus keta was reconstructed from mixed stock harvest data and incomplete sonar, weir, counting tower, and aerial survey data of varying precision from 1972 to 2007. The resulting estimates of escapement and harvest of East Fork Andreafsky River chum salmon were fitted to an age-structured Ricker spawner-recruit model. Bayesian statistical methods were employed, which allowed for realistic assessment of uncertainty in the presence of measurement error, serial correlation, and missing data.
Author: Steven J. Fleischman Publisher: ISBN: Category : Chum salmon Languages : en Pages : 37
Book Description
Historical abundance of Andreafsky River, Anvik River, and aggregated other upriver stocks of summer chum salmon Oncorhynchus keta was reconstructed from mixed stock harvest data and incomplete sonar, weir, counting tower, and aerial survey data of varying precision from 1972 to 2007. The resulting estimates of escapement and harvest of East Fork Andreafsky River chum salmon were fitted to an age-structured Ricker spawner-recruit model. Bayesian statistical methods were employed, which allowed for realistic assessment of uncertainty in the presence of measurement error, serial correlation, and missing data.
Author: James William Savereide Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 46
Book Description
An age-structured state-space spawner–recruit model was fit to estimates of relative and absolute abundance, harvest, and age composition for Copper River Chinook salmon (Oncorhynchus tshawytscha) from 1980 to 2016. Bayesian statistical methods were employed to assess uncertainty in the presence of measurement error, serial correlation, and missing data. Ricker stock-recruit parameters and management reference points were estimated, including the escapement that provides for maximum sustained yield (SMSY). It is recommended that a sustainable escapement goal range of 18,500 to 33,000 fish be adopted for Copper River Chinook salmon. Escapement is evaluated by subtracting estimates of inriver harvest from estimates of inriver abundance. Escapements within this range have a high probability of producing sustainable yields.
Author: Steven J. Fleischman Publisher: ISBN: Category : Chum salmon Languages : en Pages : 32
Book Description
Historical escapement and run size of fall chum salmon Oncorhynchus keta was reconstructed from incomplete sonar, weir, counting tower, mark-recapture, aerial survey, and foot survey data of varying precision from 1974 to 2007. The resulting estimates of drainage-wide escapement were fitted to an age-structured Ricker spawner-recruit model. Bayesian statistical methods were employed, which allowed for realistic assessment of uncertainty in the presence of measurement error, serial correlation, and missing data.
Author: James J. Hasbrouck Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 0
Book Description
The current sustainable escapement goal (700,000–1,200,000) for Kenai River late-run sockeye salmon was established in 2011. For this escapement goal review, the escapement time series and production data were updated through 2018. The fit of 6 spawner–recruit models to data from brood years 1968–2012 and brood years 1979–2012 was examined. Although the classic Ricker model was determined the most appropriate to use given the data, all brood years were estimated to have replaced themselves, which compromised obtaining accurate and precise estimates of most model parameter estimates and biological reference points, including a scientifically defensible estimate of maximum sustained yield. Markov-type yield tables were constructed to evaluate yields at different levels of escapement. We recommend the sustainable escapement goal for Kenai River late-run sockeye salmon be revised to 750,000–1,300,000 fish because the analyses indicated escapements in this range will likely provide better yields.
Author: Steven J. Fleischman Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 68
Book Description
Age-structured state-space spawner-recruit models were fit to 1986-2015 data on abundance, harvest, and age composition for early and late runs of Kenai River Chinook salmon (Oncorhynchus tshawytscha), 75 cm mid eye to tail fork (METF) and longer. Historical annual run abundance, stock recruitment parameters, and fishery management reference points were estimated from these models. Sustainable Escapement Goals of 2,800-5,600 (early run) and 13,500-27,000 (late run) Chinook salmon 75 cm METF and longer are recommended, and their attributes and limitations discussed. Fish 75 cm METF (approximately 33.3 in total length) and longer can be assessed directly by imaging sonar in the Kenai River at river mile 13.7.
Author: Toshihide Hamazaki Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 62
Book Description
The objectives of this report are to: 1) describe the productivity and capacity of the Kuskokwim River Chinook salmon stock, as quantified from stock-recruit analyses, 2) recommend a drainage-wide escapement goal based on this information, and 3) revise escapement goals for selected tributaries.
Author: Beverly A. Cross Publisher: ISBN: Category : Fishery management Languages : en Pages : 96
Book Description
A workshop was held on September 16-18, 1997 in Anchorage by the Alaska Department of Fish and Game to review Pacific salmon Oncorhynchus escapement goals for major rivers in Bristol Bay. Spawner-return data were analyzed for Kvichak, Naknek, Egegik, Ugashik, Wood, Igushik, Nushagak, and Togiak Rivers sockeye salmon 0. nerka. Sockeye smolt information was reviewed for Kvichak, Egegk, and Ugashik Rivers. Available limnological and juvenile information were analyzed fiom Lake Iliarnna. In addition, spawner-return data for Nushagak River chinook salmon O. tshawytscha were also reviewed. With a few exceptions available data supported current escapement goals in Bristol Bay. Based on this most recent escapement goal evaluation, workshop participants recommended the following changes. They recommended restructuring the escapement goal policy for Kvichak River sockeye salmon to a more robust variable escapement goal. Analyses of available data were inconclusive as to whether the underlying cause of cycles in Kvichak River sockeye production were due to inherent depensatory factors or lack of spawners. The recommended policy included an off-cycle escapement range of 2-10 million sockeye salmon with a minimum goal of 2 million and an exploitation rate of 50% on runs of 4 - 20 million. The point goal for a given off-cycle year would be 50% of the inshore Kvichak run but never less than 2 million or greater than 10 million. A 6 -10 million escapement range was proposed for pre-peak and peak cycle years with a minimum of 6 million and an exploitation rate of 50% on runs of 12 - 20 million. The point goal for a given prepeak or peak cycle year would be 50% of the inshore Kvichak run but never less than 6 million or greater than 10 million. Workshop participants also recommended managing for escapements within the middle of the current escapement goal ranges for Naknek, Egegik, and Ugashik Rivers. The current management objectives or point goals for those rivers are artifacts of past Ricker stock-recruitment models and are no longer supported by the data. Therefore, it was recommended that the management objectives be changed to 1.1 million sockeye salmon for Naknek River, 1.1 million sockeye salmon for Egegik River, and 0.85 million sockeye salmon for Ugashik River. The final recommendation coming out of the workshop was that the sockeye escapement goal range for Togiak River be changed to 100 - 200 thousand sockeye salmon. Available data supported the current management objective of 150 thousand sockeye salmon for Togiak River, but indicated an escapement range of 100 - 200 thousand would on average produce higher yields.
Author: Linda K. Brannian Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 46
Book Description
An Alaska Department of Fish and Game Escapement Goal Review Team (review team) was convened to review salmon escapement goals for the Arctic-Yukon-Kuskokwim Region in preparation for the January 2007 meeting of the Alaska Board of Fisheries. The review team made recommendations to the Regional Supervisors of the Divisions of Commercial Fisheries and Sport Fish, who in turn make recommendations to the directors of the two divisions. The review team recommended establishing three new escapement goals in the Kuskokwim Management Area, no new goals in the Yukon Management Area, and two new goals in the Norton Sound-Port Clarence and Kotzebue Management Areas. In addition they recommended revising three escapement goals in the Kuskokwim Management Area (one for Chinook salmon, one for chum salmon, and one for sockeye salmon), none in the Yukon Management Area, and five chum salmon goals in the Kotzebue Management Area. They also recommended discontinuing one aerial survey escapement goal in the Kuskokwim Management Area where that goal was recommended to be replaced with a weir goal. While most of the recommended new goals are sustainable escapement goals, spawner-recruit analyses were performed to recommend biological escapement goals for Kobuk and Noatak rivers chum salmon in the Kotzebue Management Area and Middle Fork Goodnews River Chinook and Sockeye salmon in the Kuskokwim Management Area. The escapement goal review team also made recommendations for specific stocks to be reviewed in detail prior to the 2010 Alaska Board of Fisheries meeting.
Author: Steven J. Fleischman
Author: Steven J. Fleischman
Author: 
Author: Timothy R. McKinley
Author: James William Savereide
Author: Steven J. Fleischman
Author: James J. Hasbrouck
Author: Steven J. Fleischman
Author: Toshihide Hamazaki
Author: Beverly A. Cross
Author: Linda K. Brannian