Hexanematichthys sagor, the Sagor catfish, Sagor sea catfish, Sunda sea-catfish, marine catfish or dusky catfish, is a species of catfish in the family Ariidae. It was described by Francis Buchanan-Hamilton in 1822, originally under the genus Pimelodus. It inhabits estuaries and freshwater bodies in numerous areas of the Indo-Western Pacific Ocean. It reaches a maximum total length of 45 cm (18 in), more commonly reaching a TL of 30 cm (12 in).

The diet of the Sagor catfish consists of finfish and benthic invertebrates. Its meat is sold fresh.

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