Supplement to Expanding Nushagak River Chinook Salmon Escapement Indices to Inriver Abundance Estimates Using Acoustic Tags, 2011-2014 PDF Download
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Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 297
Book Description
This report is a supplement to the report: Expanding Nushagak River Chinook salmon escapement indices to inriver abundance estimates using acoustic tags, 2011–2014. Due to the length of the original report, the complete set of fish tracks from this study, current profiles, and 2 reports by Lotek, Inc. that document the evaluation of the acoustic tag system in riverine environments have been combined into this supplemental report.
Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 297
Book Description
This report is a supplement to the report: Expanding Nushagak River Chinook salmon escapement indices to inriver abundance estimates using acoustic tags, 2011–2014. Due to the length of the original report, the complete set of fish tracks from this study, current profiles, and 2 reports by Lotek, Inc. that document the evaluation of the acoustic tag system in riverine environments have been combined into this supplemental report.
Author: Suzanne L. Maxwell Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 142
Book Description
An acoustic tag study was conducted at the Nushagak River from 2011 to 2014 to determine which portions of the river Chinook salmon Oncorhynchus tshawytscha migrate through as they pass the location of a project that uses sonar to estimate salmon passage. The tagging study was done in conjunction with the sonar project, a project that uses DIDSON (dual-frequency identification sonar) and drift gillnetting techniques to estimate sockeye O. nerka, Chinook, and chum O. keta salmon passage. Chinook salmon estimates from the sonar project are an important tool for fishery managers even though an unknown proportion migrate beyond the sonar’s limited sampling range, ~30% of the river’s width. Acoustic tags were inserted into Chinook salmon captured in drift gillnets 13 km downriver from the sonar site. An acoustic receiver array deployed at the sonar site detected 94.6% of the tagged fish, and 81.9% produced usable tracks. The percentage of tagged fish that passed through 1 or both sonar beams using length-stratified groupings was 65% in 2011, 54% in 2012, 64% in 2013, and 47% in 2014, averaging 57%. Although tagged fish were observed across the entire array, dominant travel lanes emerged that differed among study years. Expanding the sonar estimates of Chinook salmon using length-stratified proportions increased the estimates by 59,251–146,409 fish per year from sonar estimates that ranged from 70,482 to 174,085 fish per year. Our recommendations are to continue the acoustic tag study for 3 years to confirm the stability of the expansion factors and improve sonar estimates by adding a midriver sampling zone or expanding past and future estimates using expansion factors from this study.
Author: Jordan Head Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 0
Book Description
A maximum likelihood model was developed to estimate the 1968–2020 drainagewide run size and escapement of Nushagak River Chinook salmon (Oncorhynchus tshawytscha). The model simultaneously combined information by direct observations of escapement at 8 locations (1 tower and 7 aerial surveys); harvest of fish from commercial, subsistence, and sport fisheries; inriver abundance indices from the Nushagak River sonar project; and inriver abundance estimates from acoustic tag and mark–recapture studies. Results showed that reconstructed total run size ranged from 74,000 to 629,000 Chinook salmon with an average run size of 282,000 fish, and escapement ranged from 49,000 to 476,000 fish with an average of 210,000 fish. The model estimated total run and escapement appeared to be reasonable and tracked well with previous estimates. The major deficiency of this model is the absence of overlapping, long-term escapement and run monitoring data.
Author: Jim Lichatowich Publisher: ISBN: Category : History Languages : en Pages : 346
Book Description
"Fundamentally, the salmon's decline has been the consequence of a vision based on flawed assumptions and unchallenged myths.... We assumed we could control the biological productivity of salmon and 'improve' upon natural processes that we didn't even try to understand. We assumed we could have salmon without rivers." --from the introduction From a mountain top where an eagle carries a salmon carcass to feed its young to the distant oceanic waters of the California current and the Alaskan Gyre, salmon have penetrated the Northwest to an extent unmatched by any other animal. Since the turn of the twentieth century, the natural productivity of salmon in Oregon, Washington, California, and Idaho has declined by eighty percent. The decline of Pacific salmon to the brink of extinction is a clear sign of serious problems in the region. In Salmon Without Rivers, fisheries biologist Jim Lichatowich offers an eye-opening look at the roots and evolution of the salmon crisis in the Pacific Northwest. He describes the multitude of factors over the past century and a half that have led to the salmon's decline, and examines in depth the abject failure of restoration efforts that have focused almost exclusively on hatcheries to return salmon stocks to healthy levels without addressing the underlying causes of the decline. The book: describes the evolutionary history of the salmon along with the geologic history of the Pacific Northwest over the past 40 million years considers the indigenous cultures of the region, and the emergence of salmon-based economies that survived for thousands of years examines the rapid transformation of the region following the arrival of Europeans presents the history of efforts to protect and restore the salmon offers a critical assessment of why restoration efforts have failed Throughout, Lichatowich argues that the dominant worldview of our society -- a worldview that denies connections between humans and the natural world -- has created the conflict and controversy that characterize the recent history of salmon; unless that worldview is challenged and changed, there is little hope for recovery. Salmon Without Rivers exposes the myths that have guided recent human-salmon interactions. It clearly explains the difficult choices facing the citizens of the region, and provides unique insight into one of the most tragic chapters in our nation's environmental history.
Author: Erin McKittrick Publisher: The Mountaineers Books ISBN: 1594853924 Category : Biography & Autobiography Languages : en Pages : 224
Book Description
CLICK HERE to download the first chapter from A Long Treak Home * Compelling adventure with an environmental focus * An informative natural and cultural history of one of our last wild coastlines * Author is a pioneer in "packrafting," an emerging trend in backcountry travel In June 2007, Erin McKittrick and her husband, Hig, embarked on a 4,000-mile expedition from Seattle to the Aleutian Islands, traveling solely by human power. This is the story of their unprecedented trek along the northwestern edge of the Pacific Ocean-a year-long journey through some of the most rugged terrain in the world- and their encounters with rain, wind, blizzards, bears, and their own emotional and spiritual demons. Erin and Hig set out from Seattle with a desire to raise awareness of natural resource and conservation issues along their route: clear-cut logging of rainforests; declining wild salmon populations; extraction of mineral resources; and effects of global climate change. By taking each mile step by step, they were able to intimately explore the coastal regions of Washington, British Columbia, and Alaska, see the wilderness in its larger context, and provide a unique on-the-ground perspective. An entertaining and, at times, thrilling adventure, theirs is a journey of discovery and of insights about the tiny communities that dot this wild coast, as well as the individuals there whom they meet and inspire.
Author: Jim Lichatowich Publisher: ISBN: Category : Nature Languages : en Pages : 260
Book Description
Each year wild Pacific salmon leave their oceanic feeding grounds and swim hundreds of miles back to their home rivers. The salmon's annual return is a place-defining event in the Pacific Northwest, with immense ecological, economic, and social significance. However, despite massive spending, efforts to significantly alter the endangered status of salmon have failed. In Salmon, People, and Place, acclaimed fisheries biologist Jim Lichatowich eloquently exposes the misconceptions underlying salmon management and recovery programs that have fueled the catastrophic decline in Northwest salmon populations for more than a century. These programs will continue to fail, he suggests, so long as they regard salmon as products and ignore their essential relationship with their habitat. But Lichatowich offers hope. In Salmon, People, and Place he presents a concrete plan for salmon recovery, one based on the myriad lessons learned from past mistakes. What is needed to successfully restore salmon, Lichatowich states, is an acute commitment to healing the relationships among salmon, people, and place. A significant contribution to the literature on Pacific salmon, Salmon, People, and Place: A Biologist's Search for Salmon Recovery is an essential read for anyone concerned about the fate of this Pacific Northwest icon.
Author: Erin McKittrick Publisher: ISBN: 9781594857362 Category : Travel Languages : en Pages : 0
Book Description
This book follows the challenging expeditions and intimate daily life of adventure trekker Erin McKittrick and her husband, Hig, as they set out to explore the vast and remote corners of Alaska with their two young children in tow.
Author: Suzanne L. Maxwell
Author: Suzanne L. Maxwell
Author: Suzanne L. Maxwell
Author: Jordan Head
Author: Jim Lichatowich
Author: Erin McKittrick
Author: Jim Lichatowich
Author: 
Author: Erin McKittrick
Author: John H. Helle
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