Only Four of the Largest 30 Tuna Fishing Companies Disclose Catch Data…
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The study, Tuna Turner: Investors Must Turn Up Transparency in the Tuna Industry, trawls Global Fishing Watch data to reconstruct catch volumes by species and region for all 2,153 industrial vessels fishing tuna globally. The research attributes these details for the first time to companies and the countries they are headquartered, aiming to fill in the gaps in company disclosure.
The report focuses on the
30 largest harvesters of tunaglobally - the ‘Tuna 30*’ - accounting for
firms report any tuna catch volumes, with even lower transparency on species caught, location, catch methods and certification levels:
- Bolton Group - discloses this data.
Without knowing what, where, how much and how companies fish, investors cannot know which of them are most exposed to sustainability risks. Whilst most tuna stocks are not overfished, tuna biomass has declined by 40% to 80%. And, major ecological damage persists in numerous tuna fisheries.
The
Tuna 30overall extract
stocks that are not at healthy levels of abundance or that are experiencing or might experience overfishing. Planet Tracker estimates that over
of the harvest from SAPMER, China National Agricultural Development Group and Maruha Nichiro comes from such stocks.
Several tuna species are threatened with extinction. The research finds that Albacora, Maruha Nichiro, Dongwon, Bolton Group and Sajo are likely harvesters of these threatened species.
Planet Tracker also finds that
, meaning it could not be associated to a company due to missing ownership information or satellite data. Further, most Tuna 30 companies may be spending more time fishing with their Automatic Identification System (AIS) switched off than on.
The study estimates that better data on ownership information and eliminating these AIS gaps could improve profits and valuations in the industry by an average of
respectively within five years.
“Better transparency, in the form of corporate disclosure on catch and AIS usage, is crucial to help investors understand the exact risks their portfolios are exposed to. We cannot distinguish good behaviour from bad behaviour without first knowing what is actually being caught, where and how on a company-by-company basis.”
Planet Tracker urges investors to demand full disclosure from tuna companies on catch data and AIS compliance as a baseline for responsible investment.
*Planet Tracker used Global Fishing Watch data to create a database of 736,000 “likely tuna” fishing events for the year 2022, to analyse 2,153 vessels catching tuna.
https://planet-tracker.org/wp-content/uploads/2025/06/Tuna-Turner.pdf here.
Planet Tracker is an award-winning non-profit financial think tank aligning capital markets with planetary boundaries. Created with the vision of a financial system that is fully aligned with a net-zero, resilient, nature positive, and just economy well before 2050, Planet Tracker generates break-through analytics that reveal both the role of capital markets in the degradation of our ecosystem and show the opportunities of transitioning to a zero-carbon, nature positive economy.
View source version on businesswire.com:
https://www.businesswire.com/news/home/20250615089458/en/Website: https://planet-tracker.org/
Contact
Planet Tracker
Ino Rousselet
ESG Communications
+ 44 (0)7580 743 364
Sally Palmer
Head of Communications
+ 44 (0)7799472824
sally@planet-tracker.org
This news is a press release provided by Planet Tracker.
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