"Sharks have been swimming the world’s oceans for more than 400 million years — 100 million years before the first dinosaurs appeared on land. But today, shark populations are being decimated by commercial fishing, putting some species in danger of extinction.
Each year, humans kill more than 100 million sharks worldwide. This includes the tens of millions of sharks that are caught annually for their fins, which are one of the world’s most expensive seafood products.
As top predators, sharks help to manage healthy ocean ecosystems. And as the number of large sharks declines, the oceans will suffer unpredictable and devastating consequences. Sharks help maintain the health of ocean ecosystems, including seagrass beds and coral reefs. Healthy oceans undoubtedly depend on sharks."
Excerpt from: Predators as Prey: Why Healthy Oceans Need Sharks