Status of the Stocks

As a tool for RFMO policymakers and fisheries managers, ISSF produces the Status of the Stocks report, which scientifically assesses 23 commercial tuna stocks worldwide based on the most recent abundance and fishing mortality data.

The comprehensive report indicates how a stock is being managed — including through reference points and harvest control rules — and whether it is at “healthy” levels, overfished, or in danger of becoming overfished. Status of the Stocks also examines the environmental impact of tuna fishing on other marine species, or “bycatch.”

To visualize current and historical data from our stock report — on tuna stock health, and tuna catch by fishing method — use our Interactive Stock Status Tool. You can download and share the customized graphics you create.

Learn more here


Closing the Data Gap

One of the challenges in knowing how to optimally manage tuna stocks globally is the difficulty of obtaining reliable data for many species. The availability and quality of different types of data vary between species, fleets, and regions. Organizations like ISSF are invested in helping to improve the accuracy and uniformity of fisheries data. 

Dr. Simon Hoyle, a scientist for the National Institute of Water and Atmospheric Research (NIWA)in New Zealand, reflects on these efforts in a recent blog for ISSF. Since 2015, he has been developing joint longline indices in collaboration with scientists from distant water fishing nations.

Read his “Closing the Data Gap” blog post


Resources for Stock Assessment

Stock Assessment Workshop Reports

ISSF convenes periodic workshops to review Regional Fisheries Management Organization (RFMOs) strategies for assessing tuna stocks. Workshop topics have included uncertainty in stock assessment and the adoption of harvest control rules.

Read all five workshop reports here

About the International Seafood Sustainability Foundation (ISSF)
The International Seafood Sustainability Foundation (ISSF) is a global coalition of scientists, the tuna industry and World Wildlife Fund (WWF) — the world’s leading conservation organization — promoting science-based initiatives for the long-term conservation and sustainable use of tuna stocks, reducing bycatch and promoting ecosystem health. Helping global tuna fisheries meet sustainability criteria to achieve the Marine Stewardship Council certification standard — without conditions — is ISSF's ultimate objective. To learn more, visit, and follow ISSF on TwitterFacebook and Instagram.