Most jellyfish feed on small animals that they catch with their tentacles stinging cells (called nematocysts). That would sting.
After a jellyfish eats a small fish, they digest what they take in, and the excess...
Some sharks do eat jellyfish. The biggest predator of jellyfish are sea turtles.
Most likely they will. Jellyfish are carnivorous. eating; zooplankton, smaller...
Jellyfish eat mostly zooplankton, smaller fish and sometimes other jellyfish. !
Yes Bluefin tuna usually eat jellyfish, octopus, crab and sponges