Which are the largest ostariophysan fishes?

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knifefish — ostariophysan Knifefish, or featherback (Xenomystus nigri)

While most ostariophysans are small to moderate in size, ranging from 2 to 30 cm (about 1 to 12 inches), some species are considered giants of the freshwater world.1

The largest ostariophysan fishes include:

Wels (catfish): A member of the family Siluridae, the wels is a Eurasian species that can reach a length of 4.5 metres (15 feet) and weigh up to 300 kg (660 pounds).1
Mahseer: An elegant fish belonging to the family Cyprinidae, the mahseer of Asia can grow to 2 metres (about 7 feet) in length and weigh 90 kg (200 pounds).12