Oxydoras kneri is a species of thorny catfish found in the Paraná River basin in Argentina, Bolivia, Brazil, Paraguay and Uruguay. This species grows to a length of 70.0 centimetres (27.6 in) TL and reaches a weight of 9.0 kilograms (19.8 lb). This species is caught commercially for human consumption. O. kneri is omnivorous, feeding mainly on insects, crustaceans, mollusks, other invertebrates and some vegetable material.