While they may look harmless, most jellyfish have stinging tentacles that allow them to paralyze or even kill their prey before they pull the creature up to digest it. Jellyfish are opportunistic predators.
Most jellyfish are carnivores that prey on fish, crustaceans and any other swimming animals they can subdue with their venomous stinging cells. In turn, many other animals feed on jellyfish, including tuna, crustaceans, and other jellyfish. In other words, they are both predators, and prey
Jellyfish have tiny stinging cells in their tentacles to stun or paralyze their prey before they eat them. Inside their bell-shaped body is an opening that is its mouth. They eat and discard waste from this opening.
Jellyfish eat their prey by first paralyzing them by stinging them, and then drawing the prey in through the mouth, which is a hole in the middle of the jellyfish’s body, reports National Geographic. When the jellyfish has eaten and digested the prey, the waste is released through this same hole, or
Many animals use venom to protect themselves from predators and to catch prey. Some, like jellyfish, have tentacles, while others, like bees and snakes use stingers and fangs to inject their prey with venomous toxins.
The box jellyfish actively hunts its prey (small fish), rather than drifting as do true jellyfish. They are capable of achieving speeds of up to 1.5 to 2 metres per second or about 4 knots (7.4 km/h; 4.6 mph).
The small Jellyfish get caught up and they are small enough to be consumed. They don’t get filtered out like many of the larger ones do. Since these filter eating animals can consume very large amounts of prey every single day they are a very large predator of the Jellyfish.
Jellyfish and ctenophores both have tentacles with specialized cells to capture prey: nematocysts and colloblasts, respectively. Jellyfishes’ nematocysts are organelles within special cells (cnidocytes) that contain venom-bearing harpoons.