Lionfish are dangerous because they are one of the most venomous fish, and it has venomous sting. It's sting lasts 10-20 minutes. There are 40,000-50,000 cases of lionfish stinging's annually.
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Both of them are dangerous. The lionfish is full of poison spines and skin, and eats meat. Tigerfish eat meat and have sharp big teeth, but are not poisonous.