FAQs. Other species of jellyfish are among the most common and important jellyfish predators. Still, the ocean sunfish feeds on jellyfish, and jellyfish is the main food for some species of sea turtles. The box Jellyfish actively hunt their prey, which are usually small, in drifting places like ordinary jellyfish do. 01. More. They may look like a transparent umbrella, but don’t let that deceive you, the box jellyfish has a toxic venom that can stun and kill fish, and even put a human’s life at risk. Jellyfish also have little nutritional benefits for predators, since they are made up mainly of water. Many smaller predators such as the box jellyfish use venom to subdue their prey, and venom can also aid in digestion (as is the case for rattlesnakes and some spiders). Mostly Read. The Box Jellyfish is possibly the world's most deadliest jellyfish. Prey and Predators. Damocean / Getty Images Behavior . Box jellyfish are poisonous, but not dangerous, to consume–at least for some marine predators. Box jellyfish are voracious predators and are known to eat fish, crustacean arthropods, and worms, utilizing the tentacles and nematocysts (Waggoner and Collins 2000). Box jellyfish are among the oldest animals on the planet, dating back at least 600 million years, surviving several mass extinctions. In Northern Australia, they’re known as sea wasps. The most dangerous of all these species of these advanced jellies is the tiny Irukandji. To make matters worse, there is no antidote. Sea anemones may eat jellyfish that drift into their range. Here, at sea, the box jellyfish will continue to grow into adulthood until it reaches full size. Sea turtles eat box jellyfish and appear to be unaffected by the stings. The sting of a Chironex fleckeri box jellyfish can kill a person in less than three minutes. Box Jellyfish Predators What Eats Box Jellyfish | Box Jellyfish Predators March 12, 2017 November 16, 2017. Box jellyfish also use their venom to defend against predators, which include crabs, batfish, rabbitfish, and butterfish. When the tentacles contact the prey, the nematocysts fire into the prey, with the barbs holding onto the prey and transferring venom. Box jellyfish Method of attack: Stealth. The box jellyfish digests prey in the stomach inside its bell. Irukandji has a venom that can work in seconds. Other predators include tunas, sharks, swordfish, sea turtles and penguins. Tiny box jellyfish found near Australia, Carukia barnesi and Malo kingi, are responsible for the infamous and extremely painful symptomatic complex known as Irukandji syndrome.These small cubozoans' bells measure only a few millimeters with tentacles up 3 feet (1 meter). 4. Species of box jelly fish in Hawaii, Florida and other U.S. locations are known to induce heart failure. 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