If the report said 15 ft for the Snakehead they were scaremongering, a giant or red snakehead will do 7 ft max click here and while they're regarded as an ecological disaster because they're a serious apex predator in the fresh fish world, I'm not aware of any attacks on humans. How did it get there, probably sold by an irresponsible petshop to some deluded boob who had no idea that his purchase would eat everything in his tank and would eventually need a tank the size of a small house to live in. Same thing happens with red tailed catfish, only the snakeheads tough enough to survive our climate if dumped in the nearest river. Hopefully there was only the one.
Are you sure about Essex? A giant snakehead was caught by a pike angler in the river Witham in Lincolnshire, but I didn't know there was another one.
We're in trouble if these fish are breeding in our rivers - they'll prey on anything that swims, including ducks, and they have certainly been known to attack people in the water when they have young. You'll never see one 15 feet long though, they don't grow nearly that big, as Belatucadrus points out.
I've seen their meat on the menu in Singapore waterside restaurants, but so far I haven't been tempted.
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