Box jellyfish also use their venom to defend against predators, which include crabs, batfish, rabbitfish, and butterfish. Box jellyfish are poisonous, but not dangerous, to consume–at least for some marine predators. The box Jellyfish actively hunt their prey, which are usually small, in drifting places like ordinary jellyfish do. 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). Box jellyfish are among the oldest animals on the planet, dating back at least 600 million years, surviving several mass extinctions. Mostly Read. 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. Sea turtles eat box jellyfish and appear to be unaffected by the stings. When the tentacles contact the prey, the nematocysts fire into the prey, with the barbs holding onto the prey and transferring venom. To make matters worse, there is no antidote. Other predators include tunas, sharks, swordfish, sea turtles and penguins. The Box Jellyfish is possibly the world's most deadliest jellyfish. Sea anemones may eat jellyfish that drift into their range. Jellyfish have a limited number of predators, since their bodies are covered in stinging cells. Jellyfish washed up on the beach are consumed by … Prey and Predators. Jellyfish also have little nutritional benefits for predators, since they are made up mainly of water. The sting of a Chironex fleckeri box jellyfish can kill a person in less than three minutes. Here, at sea, the box jellyfish will continue to grow into adulthood until it reaches full size. Species of box jelly fish in Hawaii, Florida and other U.S. locations are known to induce heart failure. Damocean / Getty Images Behavior . More. 01. Box Jellyfish Predators What Eats Box Jellyfish | Box Jellyfish Predators March 12, 2017 November 16, 2017. The box jellyfish digests prey in the stomach inside its bell. The most dangerous of all these species of these advanced jellies is the tiny Irukandji. 4. Irukandji has a venom that can work in seconds. 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. Their numbers, as that of all jellyfish, are growing, exacerbated by warming oceans, and oxygen-depleting fertilizers that eventually find their way into the water. The box jellyfish typically reaches a length of approximately 16 to 24 cm. Box jellyfish Method of attack: Stealth. 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