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Title: Bycatch characterization in the Pacific halibut fishery: A field test of electronic monitoring technology.
Short Name: Bycatch characterization of North Pacific Halibut
Status: In Work

These data arise from a field test of electronic monitoring (EM) of vessels participating in the Pacific halibut fishery off Alaska. A side-by-side comparison was made of the hook-specific catch data reocrded by fishery observers and EM video reviewers.

There are two main components of this data: the data collected by observers and the data recorded by video reviewers (electronic monitoring). The observer data are stored in an oracle database. The hook-specific EM data have been matched to the obsever data (individual hook to individual hook) and are stored in an MS Access Database.

These data were collected during normal fishing operations onboard commercial halibut vessels fishing in the Bering Sea and Gulf of Alaska. Data collection started in April 2008 and continued through September 2008.


The goal of this project was to test the ability of EM systems to operate in a commercial setting by comparing estimates of bycatch based on data collected by an observer with estimates of bycatch based on data collected using electronic monitoring (EM).

This data was collected to meet two main objectives. The first objective of this reseach were to collect catch and bycatch data collection commercial halibut fishery longline vessels using three data collection methods 1) using EM 2) using standard Alaska Fisheries Science Center Observer Program monitoring and 3) using hook-specific documentation of catch. The second objective was to evaluate the relative efficiency, cost, and bias of each of two bycatch estimation methods (EM, NMFS Observers) relative to a standard (hook-specific catch documentation) to determine their suitability for use in fisheries management.

Other Citation Details:

Cahalan, J. A., B. M. Leaman, G. H. Williams, B. H. Mason, W. A. Karp. 2010. Bycatch characterization in the Pacific halibut fishery: A field test of electronic monitoring technology. North Pacific Research Board Final Report 712, 58pgs. plus Appendices.


Theme Keywords

Thesaurus Keyword
None Alaska
None bycatch
None Electronic monitoring
None fishery observer
None hook and line fishery
None longline fishery
None Pacific halibut fishery

Temporal Keywords

Thesaurus Keyword
None 2008

Spatial Keywords

Thesaurus Keyword
None GOA

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA
Location Description:

FMA Division

Project Information

Project Type: Project
Is Mandated?: Yes
Mandated By: North Pacific Research Board
Collection Type: Observer
Collection Authority: Federal
Collection Method: Electronic and Paper

Support Roles

Metadata Contact

CC ID: 62936
Date Effective From: 2009-01-01
Date Effective To:
Contact (Person): Turnbull, Doug
Address: 7600 Sandpoint Way NE
Seattle, WA 98115
Email Address:
Phone: (206)526-4053
Fax: (206)526-4066
Business Hours: 0700-1630
Contact Instructions:

206 526 4053


CC ID: 62941
Date Effective From: 2009-01-01
Date Effective To:
Contact (Person): Cahalan, Jennifer
Email Address:
Phone: 206 526 4185
Contact Instructions:

206 526 4185


Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 27875
W° Bound: 180
E° Bound: 120
N° Bound: 62.08333333333
S° Bound: 42

GOA Gulf of Alaska

BS Bering Sea

Extent Group 1 / Time Frame 1

CC ID: 62937
Time Frame Type: Discrete
Start: 2010-10

Access Information

Security Class: Confidential
Data Access Policy:

Aggredated data may be provided with proper confidentiality doncuments to other researchers

Data Access Constraints:

These are confidential data and may not be made available in unaggregated form without proper confidentiality documents on file with FMA Division.

Technical Environment


Comparison of species identification of catch between standard observer estimation, complete hook-status observer coverage, and EM coverage showed statistically unbiased and acceptable comparability for almost all species except for some that could not be identified beyond the species grouping levels used in management. Similarly, comparisons of total species-specific numbers of fish estimated using EM-collected and hook-status observer-collected data showed few statistically significant differences.


NPRB North Pacific Research Board

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Data Set AFSC/FMA/NPRB Halibut Bycatch Video Field Test

Catalog Details

Catalog Item ID: 7288
GUID: gov.noaa.nmfs.inport:7288
Metadata Record Created By: Doug Turnbull
Metadata Record Created: 2008-03-26 14:28+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2016-05-18
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2016-05-18
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2017-05-18