FY 2001 Study Status Report, 1 Sept. 2001, Escapement Estimates for Lake Clark Sockeye Salmon PDF Download
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Author: Carol Ann Woody
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 8
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Book Description
Author: Carol Ann Woody
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 8
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Book Description
Author: Daniel B. Young
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 33
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Book Description
The Lake Clark sockeye salmon run, a key component of the Kvichak River run, supports important Federal subsistence fisheries. This report describes findings from a salmon counting tower project conducted on the Newhalen River from 2008 -- 2011. Specific objectives were to 1) estimate sockeye salmon escapement to Lake Clark and 2) determine age, sex, and length of the Lake Clark escapement. Estimates of escapement were made at river kilometer 36 on the Newhalen River using the same tower site and protocols used in previous studies. In 2009, turbid water conditions compromised counts after July 22 and escapement after this date was estimated using historical count data. Sockeye salmon age and size were determined from otoliths collected from the Newhalen River subsistence fishery and from post-spawning fish at Lake Clark spawning habitats. During 2008 -- 2011, total Lake Clark escapement averaged 316,496 salmon and ranged from a low of 210,372 salmon in 2009 to a high of 472,962 salmon in 2008. The 2008 -- 2011 mean escapement to Lake Clark was 22% lower than the 2000 -- 2007 mean of 403,991 and 72% lower than the mean escapement of 1,135,464 during 1980 -- 1984. During the study period, the Lake Clark escapement comprised, on average, 11% of the total Kvichak River escapement, about 5% less than observed in the 1980s and 8% less than observed during the period from 2000 -- 2007. The estimated mid-point of the run was similar to previous years in 2008 and 2011 but was likely earlier than average in 2009 and 10 days later than average in 2010. The age composition of sampled fish from Lake Clark was predominately age 1.3 (48- 65%), followed by age 1.2 (22-34%), age 2.2 (1-21%), and age 2.3 (0-9%).
Author: Richard Gard
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 411
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Book Description
Author: James R. Mackovjak
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 278
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Book Description
Author: Katherine Johnson Ringsmuth
Publisher: Department of Interior National Park Service
ISBN:
Category : History
Languages : en
Pages : 368
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Book Description
Author: Michael L. Weber
Publisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 166
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Book Description
Author:
Publisher:
ISBN:
Category : Anadromous fishes
Languages : en
Pages : 152
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Book Description
Author: Nigel Haggan
Publisher: United Nations Educational, Scientific & Cultural Organization
ISBN:
Category : Social Science
Languages : en
Pages : 444
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Book Description
Drawing on a number of case studies from around the world, this publication considers how the local knowledge and practices of indigenous fishing communities are being used in collaboration with scientists, government managers and non-governmental organisations to establish effective frameworks for sustainable fisheries science and management. It seeks to contribute towards achieving the goal of establishing international responsibility for the ethical collection, preservation, dissemination and application of fishers' knowledge.
Author: David H. Johnson
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 764
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Book Description
This volume provides information about the terrestrial, freshwater, and marine habitats of Oregon and Washington and the wildlife that depend upon them; it also supports broader and more consistent conservation planning, management, and research. The 27 chapters identify 593 wildlife species, define some 300 wildlife terms, profile wildlife communities, review introduced and extirpated species and species at risk, and discuss management approaches. The volume includes color and bandw photographs, maps, diagrams, and illustrations; and the accompanying CD-ROM contains additional wildlife data (60,000 records), maps, and seven matrixes that link wildlife species with their respective habitat types. Johnson is a wildlife biologist, engineer, and habitat scientist; and O'Neill is director of the Northwest Habitat Institute; they worked together on this publication project as its managing directors. Annotation copyrighted by Book News Inc., Portland, OR
Author: Hubert-Jean Ceccaldi
Publisher: Springer Nature
ISBN: 3030434842
Category : Science
Languages : en
Pages : 521
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Book Description
Coastal and estuarine environments at the interface of terrestrial and marine areas are among the most productive in the world. However, since the beginning of the industrial era, these ecosystems have been subjected to strong anthropogenic pressures intensified from the second half of the 20th century, when there was a marked acceleration in the warming (climate change) of the continents, particularly at high latitudes. Coastal ecosystems are highly vulnerable to alteration of their physical, chemical and biological characteristics (marine intrusion, acidification of marine environments, changes in ecosystems, evolution and artificialization of the coastline, etc.).In contact with heavily populated areas, these environments are often the receptacle of a lot of chemical and biological pollution sources that significantly diminish their resilience. In this context of accelerated evolution and degradation of these areas important for food security of many populations around the world, it is necessary to better identify the factors of pressure and understand, at different scales of observation, their effects and impacts on the biodiversity and on the socio-eco-systems, in order to determine the degree of vulnerability of these coastal ecosystems and the risks they face. A transdisciplinary and integrated approach is required to prevent risks. Within this framework, operational coastal oceanography occupies an important place but also the implementation of a true socio-eco-system approach in order to set up an environmentally friendly development.
