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Easy, the Victorians were quite happy to bring alien species to this country for sport, the European wels catfish (Silurus glanis) being one, which was introduced from Scandinavia. One was recently caught in West Sussex measuring 5-foot long.
Perhaps less widely known than its more familiar European cousin, the wels (Silurus glanis), S. asotus is one of the most widely distributed of all East Asian catfishes, being found throughout much of Japan, China, Taiwan, Korea and eastern Siberia.
These catfish do not have a spine before their dorsal fin, do not have an adipose fin, and the pelvic fins are either small or absent. The anal fin base is usually very long. The largest species in this family is Silurus glanis, the Wels Catfish.
 See also: Water, Catfish, Freshwater, Fish, Species
  
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