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BiologyFound in coastal waters, estuaries (Ref. 4833) and rivers (Ref. 2847). Mud-dweller presumed to occur in estuaries (Ref. 4343). Capable of living out of the water for considerable time by taking air into the bronchial chambers (Ref. 4833). Feeds on crustaceans and other invertebrates and probably small fishes (Ref. 12693). Not seen in markets (Ref. 12693).