The box jellyfish digests prey in the stomach inside its bell. Box jellyfish also use their venom to defend against predators, which include crabs, batfish, rabbitfish, and butterfish. The sting of a Chironex fleckeri box jellyfish can kill a person in less than three minutes. 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. Other predators include tunas, sharks, swordfish, sea turtles and penguins. 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. Jellyfish have a limited number of predators, since their bodies are covered in stinging cells. Damocean / Getty Images Behavior . Irukandji is no bigger than a man's finger, but what it lacks in size, it has a sting that would make Mr. T cry like a baby. 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). 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). Sea anemones may eat jellyfish that drift into their range. Still, the ocean sunfish feeds on jellyfish, and jellyfish is the main food for some species of sea turtles. Box Jellyfish Predators What Eats Box Jellyfish | Box Jellyfish Predators March 12, 2017 November 16, 2017. Box jellyfish are among the oldest animals on the planet, dating back at least 600 million years, surviving several mass extinctions. Jellyfish also have little nutritional benefits for predators, since they are made up mainly of water. To make matters worse, there is no antidote. Prey and Predators. The box Jellyfish actively hunt their prey, which are usually small, in drifting places like ordinary jellyfish do. 4. 01. Box jellyfish are poisonous, but not dangerous, to consume–at least for some marine predators. When the tentacles contact the prey, the nematocysts fire into the prey, with the barbs holding onto the prey and transferring venom. FAQs. Box jellyfish are voracious predators and are known to eat fish, crustacean arthropods, and worms, utilizing the tentacles and nematocysts (Waggoner and Collins 2000). In Northern Australia, they’re known as sea wasps. The box jellyfish typically reaches a length of approximately 16 to 24 cm. Jellyfish washed up on the beach are consumed by … Box jellyfish Method of attack: Stealth. Here, at sea, the box jellyfish will continue to grow into adulthood until it reaches full size. The most dangerous of all these species of these advanced jellies is the tiny Irukandji. Irukandji has a venom that can work in seconds. 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