The "freshwater shark" is found almost everywhere in the British Isles living alone, preferably near weeds, where its immobility and marbled coloration of green and yellow render it almost invisible. It has a large mouth full of sharp teeth, a single dorsal fin set back near the tail, and small-looking scales. It feeds voraciously on fish, frogs, water birds, rats, voles, and also worms and insect larvae. The largest angled in England weighed 37½ lbs.,* in Scotland 47 lbs. 11 oz.,* in Ireland 53 lbs.*
*up to 1958.