December 9, 2024 — Overfishing of sharks and rays has depleted many populations, causing widespread erosion of ecological function and exceptionally high extinction risk. NOAA Fisheries coauthored a study in the journal Science that quantifies the extinction risk for the world’s 1,199 sharks and ray species over 50 years. They found that while sharks and rays are at high risk of extinction and biodiversity loss globally, this risk differs by habitat and region. There are some “bright spots” that could help species survive.
Sharks Are In Rough Shape Globally
We found that sharks and rays globally are in a worse conservation state than all other vertebrate groups, apart from amphibians. We also demonstrated the “fishing down” of shark and ray biodiversity and ecosystem function. This shows that the largest species declined first and most rapidly.
Most sharks and rays have slow population growth rates, which makes them highly vulnerable to overfishing and subsequently takes populations longer to rebuild. Around the world, sharks and rays are targeted for their fins, meat, gill plates, and liver oil. They are also caught incidentally—as bycatch—in other fisheries.