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Mekong giant catfish have very low-set eyes and are silvery to dark gray on top and whitish to yellow on the bottom. They are toothless herbivores who live off the plants and algae in the river.
Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior from the heaviest and longest, the Mekong giant catfish from Southeast Asia and the second longest, the wels catfish of Eurasia, ...
Danube catfish called wels, or sheatfish, reach a length of 13 ft (4 m) and a weight of 400 lb (180 kg), while the Mekong giant catfish can reach 10 ft (3 m) and 550 lb (250 kg). Catfish are omnivorous feeders and are valuable scavengers.
 See also: Catfish, Diver, Barbel, Adder, Beetle
  
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