Arius oetik is a species of sea catfish in the family Ariidae. It was described by Pieter Bleeker in 1846.Bleeker, P., 1846 (Apr.) [ref. 313] Siluroideorum bataviensium conspectus diagnosticus. [Inside title: Overzigt der Siluroieden, welke te Batavia voorkomen.]. Verhandelingen van het Bataviaasch Genootschap van Kunsten en Wetenschappen. v. 21 (art. 5): 1-60. It is known from tropical marine and brackish waters in the western Pacific. It reaches a maximum total length of . Its diet consists of mussels, flathead locust lobsters, shrimp, conger eels, ponyfish, squids and Indian mackerels.Food and Feeding Habits Summary for Arius oetik at fishbase.org.

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