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

In support of the IOTC ecosystem report card: Three ecosystem indicators to monitor the ecological impacts of purse seine fisheries operating in the Indian Ocean

Reference: 
IOTC-2019-WPEB15-26_Rev1
File: 
PDF icon IOTC-2019-WPEB15-26_Rev1.pdf
Type: 
Meeting documents
Year: 
2019
Meeting: 
Working Party on Ecosystems and Bycatch (WPEB)
Meeting session: 
15
Availability: 
22 August 2019
Authors: 
Andonegi E
M. Juan-Jorda
Murua H
Ruiz J
Ramos M-L
Sabarros P
Abascal F
Bach P
Abstract: 

In support of the IOTC ecosystem report card, we estimated several indicators which could be used to measure progress towards monitoring the impacts of IOTC fisheries on and the state of the “Food web/Trophic relationships” ecosystem component. An ecosystem approach requires understanding the ecological effects of removing all animals through fishing. In addition to the monitoring of the total biomass removed, it is also necessary to know the species composition of the total catch and whether they are retained or not, their life history traits and their ecological role in the food web. We used the available fishery statistics and observer data from the EU and Seychelles’ purse seine fishery targeting tropical tunas in the western Indian Ocean to examine the potential ecological effects of this fishery on the food web structure and functioning of this ecosystem. We estimated the total biomass removed by the fishery in terms of weight, trophic level and replacement time by purse seine fishing method (sets on floating objects-FOBs and sets on free schools-FSCs) across different areas in the Indian Ocean.

Footer menu

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