Red Sea species hazardous to humans

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. The effects of ciguatera poisoning can be fatal.