Human activity has placed sharks in grave danger ... help keep healthy oxygen levels in the ocean by hunting fish that eat oxygen-producing plankton. If shark populations dwindle, the ripple ...

They eat smaller fish, octopuses, squid and crustaceans. Humans are not a part of a normal shark diet because they evolved ...

Consumers may be unaware what shark they are eating - and whether it is from a ... the scientists carried out DNA tests to see what was entering the human food chain. They gathered more than ...