Migratory fish species are in drastic decline, a new UN report details

Migratory species don’t travel with a passport, but they cross borders all the time. This makes the animals’ conservation a uniquely challenging, international effort.

That effort needs a lot of work, researchers argue in the first-ever “State of the World’s Migratory Species report published February 12 by the United Nations Environment Programme.

The report is the most comprehensive tally of the over 1,000 species protected under an international treaty called the Convention on the Conservation of Migratory Species of Wild Animals, or CMS. Nearly half of CMS species are experiencing population declines. Of those, fishes are faring the worst: 97 percent, roughly 56 species, are facing extinction. That includes

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