Tuna Turner: Investors Must Turn Up Transparency in the Tuna Industry

Despite recent progress, the tuna industry faces persistent challenges: biomass is only at 20-60% of pre-industrial levels, and the industry causes a major impact on other species. The thirty largest tuna harvesters account for an estimated 46% of global tuna catch. Only four out of 30 firms report any tuna catch volumes.

Because transparency remains poor, investors cannot assess individual company risks in this climate-threatened sector. By shedding light on corporate activity in the opaque tuna industry, this analysis shows why greater transparency is urgently needed – not just for ocean health, but to reduce investor risk and to support the financial performance of tuna harvesting companies.