Piraiba Catfish (Brachyplatystoma filamentosum)
Maximum Length: Up to 9-½ feet
Maximum Weight: Over 500 pounds
The Amazon's Largest Catfish: The piraiba boasts the title of largest catfish in the Amazon River, and it has a sordid reputation for biting off more than it can chew (or, in this case, swallow). The piraiba's massive mouth can measure more than 40 centimeters (nearly 16 inches) across. Fishermen have found monkeys, large birds, cats, dogs and even other catfish inside of these massive animals, indicating that the piraiba happily scavenges dead creatures in the water.
Maneater or Misunderstood? One particularly gruesome tale recounts that a fisherman dove down to untangle a net and never emerged from the water. His fellow fishermen found his body hours later when a giant piraiba floated to the surface in distress. Only the fisherman's legs were visible, protruding from the piraiba's mouth. Fishermen in the Amazon respect the piraiba as a worthy adversary, noting that the powerful piraiba can drown a wrestling fisherman by dragging him to the bottom of the river. Still, power and a notoriously voracious appetite do not necessarily make the piraiba a river monster prone to attacking and preying on live humans.
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Credit for info and pic goes to
http://animal.discovery.com/fish/river-monsters/piraiba-catfish/