Urgent Call to Protect Declining Migratory Fish Populations

Tue Mar 24 2026 14:53:25 GMT+0000 (Coordinated Universal Time)

A new UN report reveals a staggering 81% decline in migratory fish species, urging immediate conservation measures to protect vital ecosystems and livelihoods worldwide.

Migratory fish species are facing severe threats, including habitat loss, pollution, and overfishing, leading to an alarming 81% decline in their populations over the last 50 years. The UN has prioritized 30 species for global conservation to ensure their survival and the health of the ecosystems they inhabit. Conservationists stress the critical role these fish play in food security for millions and urge coordinated global efforts to safeguard their routes and habitats.

Urgent Call to Protect Declining Migratory Fish Populations

Fish species that undertake mammoth migrations through rivers, lakes, and ponds are facing a combined threat from dams, pollution, and overfishing preventing them from reaching their breeding grounds. The golden mahseer and goonch catfish are among the thirty flagship fish species prioritized for global conservation by the UN in a new report.

A team of international scientists assessed over 15,000 species of freshwater migratory fish and found their numbers had dropped by an estimated 81% in the last half-century. For too long, this group has been ignored, despite being essential to people's livelihoods.

Dr. Zeb Hogan, a professor at the University of Nevada, stressed that freshwater fish support hundreds of millions of people globally. Migratory freshwater fish contribute not only to food security but also showcase a rich diversity that is critical to protect. The report highlighted species that can weigh over 650 lb and migrate over 7,000 miles, such as the golden dorado and tropical eels.

In 2011, the UN first evaluated migratory fish populations, assessing only 3,000 species. With expanded research, they have now identified 325 fish needing urgent inclusion in global monitoring agreements, including 30 key species from regions like the UK.

However, overfishing and habitat loss remain significant concerns. The UN's report emphasizes the necessity for coordinated international efforts to conserve migratory fish, as most species traverse multiple countries during their migrations.

The ongoing threats, especially habitat fragmentation and barriers like dams, significantly disrupt migration routes, increasing the risk of disease and predation for affected species.

Environmental experts advocate for the removal of redundant barriers to enable smoother migration paths, implying that small culverts could significantly affect fish populations if removed.

With a looming deadline for action, the UN aims for these 30 species to be added to an international treaty for conservation efforts, advocating rapid recovery in populations to ensure healthier ecosystems for future generations.