Predatory 'Frankenfish' that looks like a snake and can live out of water for days to be hunted.

The Department of Environmental Conservation is set to survey Harlem Meer, pictured right, searching for the toothy northern snakehead fish, left and right, that officials say threatens to disrupt the ecosystem in the New York city lakes. Anglers who snag one of the unappealing fish have been told not to throw it back but to hand it over to officials or call 311.