How large can the wels catfish grow?

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knifefish — ostariophysan Knifefish, or featherback (Xenomystus nigri)

The wels catfish (Silurus glanis) is one of the largest freshwater fish found in Europe. It can reach a maximum length of approximately 4.5 meters (15 feet) and can weigh up to 300 kilograms (660 pounds).1