Wels, also called waller species Silurus glanis, large, voracious catfish of the family Siluridae, native to large rivers and lakes from central Europe to western Asia. One of the largest catfishes, as well as one of the largest of European freshwater fishes, the wels attains a length of about 4.5 m 15 feet and a weight of 300 kg 660 pounds.
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