What tackle to use
7 - 9 wt outfits.
What flies to use
Deceivers; Clouser; Popper; Crease fly; Gurgler; Whistlers; Prawn imitations; Crabs
Mangrove Jacks will feed on smaller baitfish, prawns, crabs etc.. ambushing prey from the safety of overhanging structure, logs, reefs or bommies.
Cast close to the structure because that's where jacks will be. Let the fly sink and strip it back with short sharp strokes ... bounce, bounce. If you don't get a strike, lift the fly and re-cast. Jacks don't really like to venture too far from the protection of the structure they call home.