In these reports, we share our research-based recommendations for sustainable tuna fisheries management, covering observer programs, transshipment, and many other key topics.

Best practices reports are authored by our fisheries policy experts and/or fisheries scientists. See also our companion “best practices snapshots” series and our scientific reports.

ISSF 2018-16: A Pre-Assessment of the Sustainability of Global Tuna Fisheries Relative to Marine Stewardship Council Criteria: Principle 2

Date Added: May 22, 2018
Authors: Paul A.H. Medley, Tristan Southall, Jodi Bostrom, Erika Zollett, Gudrun Guadian
Downloaded: 571 times
Tags: Harvest Strategies, MSC Certification, RFMOs, Stock Assessment, Tuna
Language: English
Featured: False
Report Type: Technical Report


The Marine Stewardship Council (MSC) has established a program whereby a fishery may be certified as being sustainable. The sustainability of a fishery is defined by MSC criteria which are embodied in three Principles: relating to the status of the stock (P1), the ecosystem of which the stock is a member (P2) and the fishery management system (P3).

This report is focused on Principle 2:

  • Principle 2 (P2): Fishing operations should allow for the maintenance of the structure, productivity, function and diversity of the ecosystem (including habitat and associated dependent and ecologically related species) on which the fishery depends.

This Principle 2 relates to the performance of the specific fishery relative to all wider ecological impacts.

The approach adopted here uses the MSC definition of a unit of assessment (UoA), which is the combination of the fish stock (biologically distinct unit) with the fishing method (vessel(s) targeting that stock) in a specific area. In total, 166 UoAs have been identified for these pre-assessments.

Download Related Report Materials
Along with this report, we’ve published a P2 scoring overview summary table, a PSA scores summary table, and 166 UoA individual reports, which you can download on this site.