Dive shops in Florida and the Caribbean are asking clients to record where they find these ravenous consumers of native fish, and are encouraging divers to go spear fishing for them.

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People in moderately developed places that have few amenities such as road, schools and electricity often tend to depend less on fishing, but they also have more access to engine-powered boats, spear guns, and other technologies that can rapidly deplete some fish species, said Joshua Cinner of James Cook University in Australia in the report.

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Suppose Robinson Crusoe is tired of trying to scoop up fish with his hands and figures out how to turn a tree branch into a spear, increasing his daily catch tenfold.

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If one of us saw a fish, we would try to triangulate it, while Achor Achor thrust the stick into the water, attempting to spear it.

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