Answer:

Sometimes people kill sharks for sport while fishing. Other times, humans kill sharks for fishing to use their meat as food and to use their fins for medicinal purposes.

A large number of sharks is a victim of bycatch, as result of commercial fishing since some of the most valued species are also the favorites of some species of sharks.

Links to other pages in this site

What Is The Habitat Of A Shark?
Why Do Sharks Drown When Pulled Backwards?
How Does A Whale Shark Reproduce?
Where Do Sharks Live?
How Do Sharks Use Static Electricity?