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Although most species in the Red Sea pose no threat to humans, there are a few notable exceptions.
Ciguatera poison
Ciguatera poisoning is a danger posed by fish at the top of the food chain, in particular the Twinspot snapper and Giant moray. These fish accumulate a toxin produced by a dinoflagellate which is eaten by their prey species. Ciguatera poisoning can be fatal.
References
Red Sea species hazardous to humans Wikipedia(Text) CC BY-SA