While biologists aren't yet calling the fish pests, they are puzzled by boom. Jan. 20, 2013— -- The enormous wels catfish is rapidly expanding in German waters. The fish can grow up to 10 feet ...
Wels catfish are so big they make the biggest blue catfish look small. The species is the largest freshwater fish in Europe. They are capable of living for decades, grow continuously as they age, and ...
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