Age-specific movement patterns of sablefish (Anoplopoma fimbria) in Alaska

Maloney, Nancy E. and Sigler, Michael F. (2008) Age-specific movement patterns of sablefish (Anoplopoma fimbria) in Alaska. Fishery Bulletin, 106(3), pp. 305-316.

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Over 34,000 age 0–2 juvenile sablefish (Anoplopoma fimbria) were tagged and released in southeast Alaska waters during 1985–2005. The data set resulting from this tagging study was unusual because of its time span (20 years) and because age could be reliably inferred from release length (i.e., tagged and released fish were of known age); thus, age-specific movement patterns could be examined. The depth- and area-related recovery patterns supported the concepts that sablefish move to deeper water with age and migrate counterclockwise in the Gulf of Alaska. Availability to the fishery increased rapidly for fish of younger ages, peaked at age 5 to 6, and then gradually declined as sablefish moved deeper with age. Decreased availability with age may occur because of lower fishing effort in deep water and could have substantial implications for sablef ish stock assessments because “domeshaped” availability influences the reliability of abundance estimates. The area-related recovery pattern was not affected by year-class strength; i.e., there was no significant densitydependent relationship.

Item Type: Article
Title: Age-specific movement patterns of sablefish (Anoplopoma fimbria) in Alaska
Personal Creator/Author:
Maloney, Nancy E.
Sigler, Michael F.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 3
Page Range: pp. 305-316
Date: 2008
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Item ID: 8840
Depositing User: Patti M. Marraro
Date Deposited: 12 Jun 2012 17:53
Last Modified: 12 Jun 2012 17:53

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