Short Citation:
Southwest Fisheries Science Center, 2021: Eastern Pacific Ocean Purse-seine Fishery,

Item Identification

Title: Eastern Pacific Ocean Purse-seine Fishery
Status: In Work
Creation Date: 1959

This data set contains vessel logbook and landings data sets from U.S.A.-flagged purse-seine vessels fishing in the Eastern Pacific Ocean (EPO). These purse seiners range in size from small coastal vessels to large offshore vessels. Historically, California-based large purse-seine vessels targeted tropical tunas in the Eastern Tropical Pacific (ETP), but these vessels have moved to the western-central Pacific Ocean (see WCPO Purse-seine Fishery) and only occasionally fish in the EPO. Smaller coastal purse-seine vessels target sardine, anchovy, mackerel, and other coastal pelagic species (CPS), but opportunistically fish for bluefin tuna when they are available in the California Bight. Logbook and landings data have been collected from 1952 - present by the Inter-American Tropical Tuna Commission (IATTC). Large purse-seine vessels carry biological observers to monitor interactions with dolphins as a requirement of the Marine Mammals Protection Act and other bycatch species. The IATTC manages the observer program, however historical NMFS observer data are managed by the SWFSC Protected Resources Division.


Data gathered from the EPO purse-seine fishery are used in analyses of the status of tunas in the EPO. Catch data are used to monitor the status of key tuna stocks.


Large purse-seine vessels that wish to fish in the EPO must register on the IATTC vessel registry (or opt for one trip per year) and carry an IATTC observer (or cross-over endorsed observer from the WCPO). Data are collected by NMFS and IATTC for these trips. Coastal purse-seine vessels that plan to target HMS must register with the IATTC vessel registry, be permitted by NMFS, and carry an IATTC logbook. Comparisons of landings and logbooks collected indicate that some logbooks are missing in some years for small coastal vessels.

Supplemental Information:

Public domain data (catch by year, flag, gear, species) for the EPO Purse-seine fishery can be accessed on the IATTC website. IATTC also has data on size composition (port sampling), observers, and tagging. Historical NMFS observer data is managed by the SWFSC Protected Resources Division.


Theme Keywords

Thesaurus Keyword
None landings
None length frequency
None logbook
None purse seine
None skipjack
None yellowfin

Spatial Keywords

Thesaurus Keyword
None Eastern Pacific Ocean

Physical Location

Organization: Southwest Fisheries Science Center
City: La Jolla
State/Province: CA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Database
Maintenance Frequency: As Needed
Data Presentation Form: Table (digital)
Entity Attribute Overview:

Attributes describe areas, dates, catches, fishing effort, sizes of fish.

Support Roles

Data Steward

CC ID: 262267
Date Effective From: 2008
Date Effective To:
Contact (Person): Childers, John
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: (858)546-7192
Fax: (858)546-7003
Business Hours: 7:00 a.m. - 4:30 p.m.


CC ID: 262269
Date Effective From: 2008
Date Effective To:
Contact (Organization): Southwest Fisheries Science Center (SWFSC)
Address: 8901 La Jolla Shores Dr.
La Jolla, CA 92037
Phone: (858)546-7000
Business Hours: 8:00-16:30

Metadata Contact

CC ID: 262268
Date Effective From: 2008
Date Effective To:
Contact (Person): Childers, John
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: (858)546-7192
Fax: (858)546-7003
Business Hours: 7:00 a.m. - 4:30 p.m.

Point of Contact

CC ID: 262266
Date Effective From: 2008
Date Effective To:
Contact (Person): Childers, John
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: (858)546-7192
Fax: (858)546-7003
Business Hours: 7:00 a.m. - 4:30 p.m.
Contact Instructions:

Contact via email

Point of Contact

CC ID: 262270
Date Effective From: 2003-09-15
Date Effective To: 2008
Contact (Person): Coan, Al
Address: 8901 La Jolla Shores Dr.
La Jolla, CA 92037
Email Address:


Currentness Reference: Historical data set

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 262146

Eastern Pacific Ocean

Extent Group 1 / Time Frame 1

CC ID: 262147
Time Frame Type: Continuing
Start: 1959

Access Information

Security Class: Sensitive
Data Access Policy:

The data are confidential and can only be presented in summarized form to the public. Researchers with appropriate clearance can access the more detailed data.

Data Access Procedure:

Contact point of contact. Supply official request for data and purpose of that request.

Data Access Constraints:

NMFS personnel need a signed non-disclosure agreement statement to access the detailed data. There are no constraints on access to summarized data.



CC ID: 865516
URL Type:
Online Resource
File Resource Format: ZIP

Tuna EPO purse seine catch and effort aggregated by year, month, flag or set type, 1°x1°

Data Quality


coverage rates vary by year but are generally greater than 50%. Large purse seine vessels are required to submit logbook data to IATTC and sometimes required to carry IATTC observers.

Quality Control Procedures Employed:

Data are edited by IATTC staff. Data are also edited by SWFSC in cooperation with IATTC

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Is Access to the Data Limited Based on an Approved Waiver?: Yes
Approximate Delay Between Data Collection and Dissemination: one year
If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed:


Actual or Planned Long-Term Data Archive Location: NCEI-CO
Approximate Delay Between Data Collection and Archiving: five years
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data are stored on agency servers following standard agency security policies


Lineage Statement:

Logbook data are supplied directly to IATTC and shared with SWFSC on an ad-hoc basis. Size data are collected by IATTC. Landings outside the USA are collected and maintained by IATTC

Acquisition Information


Instrument 1

CC ID: 865517
Identifier: Purse Seine
Instrument / Gear: Gear
Instrument Type: Seine Nets

A purse seine is a large wall of netting deployed around an entire area or school of fish. A purse seine has rings along the bottom of the net through which a drawstring cable is threaded. Once a school of fish is located, the vessel encircles the school with the net. The cable is then pulled in, ‘pursing’ the net closed on the bottom, preventing fish from escaping by swimming downward.


Platform 1

CC ID: 865518
Identifier: Charter vessels-small boats

various vessels ranging in size (20-40 ft length) chartered for cetacean surveys when a NOAA small boat is not available.

Mounted Instrument 1

Identifier: Purse Seine

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity (ENT) Eastern Pacific Ocean Purse-seine Landings Data
Entity (ENT) Eastern Pacific Ocean Purse-seine Logbook Data

Catalog Details

Catalog Item ID: 2321
Metadata Record Created By: Karen L Sender
Metadata Record Created: 2006-07-17 13:10+0000
Metadata Record Last Modified By: Mihir Desai
Metadata Record Last Modified: 2019-07-25 11:46+0000
Metadata Record Published: 2016-01-05
Owner Org: SWFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2017-01-05