Jellyfish are equipped with a venom apparatus for defense and feeding known as cnidoblast. Within the cnidoblast is a capsule known as a nematocyst, which contains a stinging structure consisting of a hollow barbed coiled thread, which uncoils when venom is discharged. Nematocysts are concentrated on the tentacles of the jellyfish, but not all jellyfish use their nematocysts to discharge venom; some just use them to stick to/wrap around prey (like the egg yolk jelly). But the jellies that do use the nematocysts for subduing prey, the toxin can vary.
Jellyfish toxins can vary with the type of jelly, but many have deleterious effects on cell membranes, causing them to rupture. This can cause the breaking up of red blood cells. Other jellyfish toxins contain immobilizing agents, causing disruptive effects on the action of nerve and muscle cell membranes. Jellyfish that prey on fish will use these types of toxins, such as the sea wasp, or the Portuguese man-of-war jelly.
The box jellyfish is the deadliest animals in the world. The body of a jellyfish aka sea wasps can weight as much as 2kg. The tentacles have about 5,000 nematocysts, ot stinging cells. Chemicals from the surface of the fish, shellfish and humans activate these. Contact with 3m of tentacles may be fatal for an adult. There are many (about 70) reported deaths that have occured in northern Australia between November and April. The box jellyfish also has 4 eyes, in a way they can see forward and back (ready to attack). Interesting fact..turtles are not affected by the stings from the jellyfish and usually eats them. Hope this helps!
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