Sonar Enumeration of Pacific Salmon Escapement Into the Nushagak River, 2003 PDF Download
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Author: Charles E. Brazil
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 63
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques. Estimates of species, age, sex and size composition were derived from samples obtained with drift gillnets.
Author: Charles E. Brazil
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 63
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques. Estimates of species, age, sex and size composition were derived from samples obtained with drift gillnets.
Author: Charles E. Brazil
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 78
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques from June 8 through July 17, 2006. Estimates of species composition, age, sex and size composition were derived from samples obtained with drift gillnets at the sonar site.
Author: Charles E. Brazil
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 124
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques. Estimates of species, age, sex and size composition were derived from samples obtained with drift gillnets at the sonar site.
Author: Gregory B. Buck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 81
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques from June 6 through July 18, 2008. Estimates of species composition, age, sex and size composition were derived from samples obtained with drift gillnets and a beach seine at the sonar site.
Author: Charles E. Brazil
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 154
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques. Estimates of species, age, sex and size composition were derived from samples obtained with drift gillnets at the sonar site.
Author: Gregory B. Buck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 79
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques from June 4 through July 19, 2007. Estimates of species composition, age, sex and size composition were derived from samples obtained with drift gillnets and a beach seine at the sonar site.
Author: Gregory B. Buck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 78
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Book Description
Estimates of Pacific salmon escapement for the Nushagak River in Bristol Bay, Alaska, were determined via hydroacoustic techniques from June 6 through July 18, 2009. Estimates of species composition, age, sex and size composition were derived from samples obtained with drift gillnets and a beach seine at the sonar site.
Author: Gregory B. Buck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 73
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Book Description
Hydroacoustic techniques were used to develop escapement estimates of sockeye (Oncorhynchus nerka), Chinook (O. tshawytscha), and chum (O. keta) salmon for the Nushagak River in Bristol Bay, Alaska during 2010?2012. Coho (O. kisutch) and pink salmon (O. gorbuscha) salmon escapements were estimated in 2012. A standard range dual-frequency identification sonar (DIDSON) was used to estimate salmon escapement on the left (south) bank, and a long range DIDSON was used to estimate salmon escapement on the right (north) bank. Estimates of species composition, age, sex, and size composition were derived from samples obtained using drift gillnets at the sonar site. Final escapement estimates for sockeye salmon were 468,696 (2010), 428,191 (2011), and 432,438 (2012). Final escapement estimates for chum salmon were 273,914 (2010), 248,278 (2011), and 395,165 (2012). Final escapement estimates for Chinook salmon were 60,185 (2010), 108,278 (2011), and 174,085 (2012). Coho and pink salmon escapements were 329,946 and 1,214,960 in 2012. The major age class estimated for sockeye salmon was age 1.3, which ranged from 65% to 93% of the escapement in 2010-2012. The major age class for Chinook salmon was age 1.3, which ranged from 40% to 53% of the escapement in 2010-2012. The major age class for chum salmon was age 0.3, which ranged from 54% to 65% of the escapement in 2010-2012.
Author: James D. Miller
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 75
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Book Description
Author: Greg Buck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 41
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Book Description
The Alaska Department of Fish and Game, Division of Commercial Fisheries, monitors annual escapements of salmon returning to the Nushagak River system near Dillingham, Alaska. Hydroacoustic techniques, dual frequency identification sonar (DIDSON), are used to develop escapement estimates of sockeye Oncorhynchus nerka, Chinook O. Tshawytscha, chum O. keta, coho O. kisutch, and pink O. gorbuscha salmon into the Nushagak River. Sonar passage estimates are used for inseason management of commercial fisheries in the Nushagak District. Estimates of species composition, age, sex, and length, are derived from samples obtained with drift gillnets. This report provides operational guidelines for the Nushagak River sonar project, estimation of salmon escapement, and sampling procedures, as well as general camp policies.
