Jump to navigation
Food and Agriculture Organization

User menu

  • Contact us
  • Login

Search form

  • English
  • Français
Indian Ocean Tuna Commission
Indian Ocean Tuna Commission
  • Home
  • The Commission
    • Overview
    • Structure of the Commission
    • Scientific Committee
    • Compliance Committee
    • Standing Committee on Administration and Finance
    • Competence: Area & Species
    • History & Basic texts
    • Conservation and management measures
    • Cooperation with other organisations
    • Capacity building
    • Performance Review
    • The Secretariat
    • Secretariat Staff
    • Allocation Estimations
    • Observers to IOTC meetings
  • Science
    • Overview
    • Scientific Committee
    • Status of the stocks
    • Working Parties: Science
    • Regional Observer Scheme: Science
    • Science: Capacity Building
    • IOTC Science Glossary
    • Invited Experts and Consultants
  • Compliance
    • Overview
    • Capacity building: Compliance
    • Compliance Committee
    • Information for MCS purposes
    • Monitoring of compliance
    • Port State Measures
    • Regional Observer Programme on Transhipments
    • Reporting Templates
    • Statistical document programme
    • StatDoc Validation
    • Vessel records/ IUU Vessels List
  • Data
    • Overview
    • Reporting data to the IOTC
    • Available datasets
    • Reference data catalogue
    • Fisheries identification wizard
    • Interactive data browser
    • Status of reporting of fisheries statistics
    • Capacity building: Data
    • Tagging Data
  • Projects
  • Meetings
  • Documents
  • News
  • Educational Tools

Quick links

  • Home
  • Allocation estimations
  • Capacity building
  • Conservation and management measures
    • Search
  • E-PSM application
    • Request to enter port (AREP)
  • IOTC Circulars
  • IOTC Science Glossary
  • IUU Vessel list
  • Interactive data browser
  • Performance Review
  • Statdoc Validation
  • Stock Status Dashboard
  • Vessel records
  • e-MARIS
  • e-RAV

Standardization of bigeye and yellowfin tuna CPUE by Japanese longline in the Indian Ocean which includes cluster analysis

Reference: 
IOTC-2019-WPTT21-20_Rev1
File: 
PDF icon IOTC-2019-WPTT21-20_Rev1.pdf
Type: 
Meeting documents
Year: 
2019
Meeting: 
Working Party on Tropical Tunas (WPTT)
Meeting session: 
21
Availability: 
11 October 2019
Authors: 
Matsumoto T
Hoyle S
Abstract: 

Standardizations of Japanese longline CPUE for bigeye and yellowfin tuna in multiple Indian Ocean regions were conducted using generalized linear models (GLM) with log normal and delta-lognormal errors. The models incorporated fishing power based on vessel ID where available, and used cluster analysis to account for targeting. The variables year-quarter, vessel ID, latlong5 (five degree latitude-longitude block), cluster and number of hooks were used in the standardization. Dominant species differed depending on clusters. The effects of each covariate differed depending on species and region. The CPUE trends were similar to those estimated using ‘traditional’ method, though with some differences due to the inclusion of vessel effects and cluster variables.

Footer menu

  • Home
  • The Commission
  • Science
  • Compliance
  • Data
  • Projects
  • Meetings
  • Documents
  • News
  • Educational Tools