No not all jellyfish are poisonous to humans. The Cannonball jellyfish is one variety that is used for food because their toxins do not cause harm to the humans who catch, process or eat them.
All jellyfish have poisonous stingers, yes. Some of them are weak enough that they don’t harm humans, but can still catch fish within their tentacles, much like sea anemones. If you’re ever at an aquarium with a petting pond, you can touch a less poisonous anemone, and feel how their tentacles will stick to your skin. Jellyfish have the same types of poisonous stingers as anemones, but are simply free floating rather than anchored in place. I don’t recommend touching wild animals, however, to see how poisonous they are!
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