The mangrove jack (Lutjanus argentimaculatus) is a robust, predatory fish commonly found in coastal waters, estuaries, and mangrove habitats across the Indo-Pacific region. Known for its aggressive nature, the mangrove jack is a versatile species that can live in both freshwater and saltwater environments. Juveniles typically stay in brackish areas, while adults move to deeper offshore reefs. They have a reddish-brown color that darkens with age, and they are popular among anglers for their fighting ability and as a prized food fish.