Evaluation of Pot and Longline Gear as Survey Tools for Sablefish, 2001. Information Report 2001-03

Identification Information

Citation

Originator: Matteson, K., R.W. Hannah and J.T. Golden

Publish Date: January 2001

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Cedric Cooney

Job Position: Natural Resources Data and Systems Manager

Telephone: 503-947-6094

E-Mail Address: Cedric.X.Cooney@odfw.oregon.gov

Description

Abstract: To evaluate the stock status of sablefish (Anaplopoma fimbria) more accurately, additional indites of their abundance are needed, both in currently surveyed areas and in areas not surveyed (i.e., beyond 700 fathoms). We conducted a series of experiments to evaluate the utility of two fixed gears, pot and longline, for synoptic abundance surveys along the U.S. Pacific coast to augment the current annual National Marine Fisheries Service (NMFS) slope trawl survey. Initially, both gears were tested for fishing capability in very deep water, 600 to 1000 fathoms. We then compared gears at moderate depths (three strata centered on 200,400, and 600 fathoms, ±50 fathoms) using a stratified systematic block design to determine catch rates and variability. Sablefish were measured and sex recorded to determine the relative selectivity of the two gears. We also tested whether different pot spacing along the groundline had an effect on catch rates. We found that both gear types were capable of fishing in very deep water with a minimum of problems, provided a strong enough groundline was used. In all depth strata, pot gear had a higher catch rate.and a lower catch variance than did longline gear. Pot gear also showed a broader size selectivity range for sablefish. No consistent relationship between pot spacing and catch rate was detected. We conouded that pot gear is the preferable fixed gear survey tool off the U.S. Pacific coast because of its ability to fish very deep water, its higher catch rate, lower variability, and broader size selectivity.

Purpose:

Time Period of Content:

Geographic Extent: Oregon Coast

Status: Final

Use Constraints:

Format: PDF File

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Bibliography Information

Field Name	Value
Biblio ID	7366
Year	2001
Publisher
Request Type	Information & Education
Location	Salem HQ
Date Created	Jan 2001
Date Cataloged	6/22/05
Date Published	Jan 2001
Type	info repo
Pages	63 pp
Volume	2001-03
Status	2
Descriptor	gear; pot spacing;longline gear; sablefish; Oregon, fishing gear; harvest
Date Entered	2005-06-22 16:15:18
Location In Clackamas Library	S wall, yellow info reports 2nd row
Author	Keith Matteson; Robert W Hannah; James T Golden
Duplicates	0
Number Remaining After Requests	21
Presumed All Distributed
Back Room Duplicates
Author
Risk
Species
Disposition Of Requests	StreamNet Library: Request filled
Disposition Of Requests	StreamNet Library: Duplicate request
Disposition Of Requests	State Archive: Request filled

Is a physical copy maintained for reference at Headquarters? Yes