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Either use a bow and arrow to shoot the jellyfish from the beach, then swim in and kill them, or swim in and then out to lure them close to the shore, where you can use a pike to kill them.

Basilosaurus don’t get electrocuted by jellyfish, so if you go swimming around on a basilosaurus and attack jellyfish, you can get a decent amount of bio toxin.

(I haven’t noticed that certain weapons or creatures get any more bio toxin than others.)

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