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 thirty flagship fish species that have now been 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, which make up half of all fish species, and found their numbers had dropped by an estimated 81% in the last half century.
The authors emphasized that these fish have often been overlooked but are essential for many communities' livelihoods.
Freshwater fish support hundreds of millions of people globally, providing food for about 200 million and showcasing immense biodiversity that needs urgent protection. Dr. Zeb Hogan, co-author of the report, described the significant diversity among migratory fish and the need for conservation efforts.
More than 325 fish species have been identified that require monitoring and support, with 30 being highlighted as priorities. This includes species found in the UK like the Allis Shad and Atlantic Salmon.
A key finding of the report was the recognition of migration disruption due to barriers like small dams and weirs, which are prevalent in Europe, affecting the energy reserves and overall health of migrating fish.
With coordinated international efforts recommended by the UN, the upcoming treaty meeting aims to solidify protections for these vital migratory species.
