Assessment of walleye pollock stocks in the eastern North Pacific Ocean: an integrated analysis using research survey and commercial fisheries data ...

• Main Authors: Wespestad, Vidar G., Megrey, Bernard A.
• Format: Report
• Language: unknown
• Published: Rapports et procès-verbaux des réunions (1903–1991) 2023
• Subjects: Fisheries and aquaculture; Technologies and data; Pacific, Northeast FAO area 67; Bering Sea; Gulf of Alaska; Pacific; Theragra chalcogramma; Alaska
• Online Access: https://dx.doi.org/10.17895/ices.pub.19280018; https://ices-library.figshare.com/articles/report/Assessment_of_walleye_pollock_stocks_in_the_eastern_North_Pacific_Ocean_an_integrated_analysis_using_research_survey_and_commercial_fisheries_data/19280018

Walleye pollock ( Theragra chalcogramma ) is the single most abundant fish species in the North Pacific Ocean. Concentrations of this species, which occur in the eastern Bering Sea and western Gulf of Alaska, support the largest single-species commercial fishery in the world. Exploitation of these stocks began in the early 1960s primarily by foreign national fleets. Currently the fishery is in a transitional phase. Over a relatively short time a combination of events dramatically reshaped the fishery from a multispecies foreign bottom-trawl fishery to a joint-venture fishery and finally to an expanding domestic presence. In the process, patterns and methods of fishing have changed as have the fishery parameters estimated from assessment models. In the past, fishery assessments were based on limited non-directed bottom-trawl survey c.p.u.e., fishery c.p.u.e., and length-frequency analysis. Beginning in 1979, the use of hydroacoustic surveys allowed the assessment of the midwater portion of the stock which ...