I have not met a Northern Snakehead (Channa argus) in the wild, and now that I've seen the Maryland DNR's snapshots (scroll all the way down for some evil teeth), I hope I never do.
John Neilsen Nielsen, for
"Morning Edition," recently covered the unsettling discovery of several individuals in the Potomac below Alexandria, and there is an update from Maryland's Department of Natural Resources.
Robert Hilton has written
a good overview of the beastie's biology. If this invasive species from Asia gets established, it threatens to be the fish equivalent of the European Starling (Sturnus vulgaris).
It is a voracious top-level predator, meaning that it has no natural enemies, and could decimate populations of native fish. About 90% of its diet consists of other fish, though it also eats crustaceans, insects, and plants. In its native range it can live in water with temperatures ranging from 0 to 30 degrees C; it is found in muddy or vegetated ponds, swamps, and slow-moving streams. Snakeheads can breathe air and survive for up to four days out of water, and can survive for longer periods of time when burrowed in the mud. They are capable of traveling over land to new bodies of water by wriggling their bodies over the ground. These features are adaptations to the seasonal drying of shallow bodies of water in the snakeheads native habitat in China and allow it to disperse widely should local conditions become unfavorable. It is capable of surviving in much of North America should it become established.
Neilsen's Nielsen's story includes an audio clip from Snakehead Terror, which apparently went straight to video.
posted:
9:41:01 PM
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