Whats the leatherback turtles food chain?

The Leatherback turtle eats plankton and sharks eat it

this statement is incorrect. firstly the Dermochelys Coriacea does not eat plankton it's primary food source is jellyfish. Secondly sharks cannot eat it! a adult leatherback can weigh up to 2000 lbs no way any shark can eat that! Killer whales are the only carnivorous animal large enough to consume a Dermochelys Coriacea.