What tackle to use
8 - 10wt outfit is ideal, rigged with an intermediate or floating line. Barra have sharp edges on their gill plates which they use to great effect when rattling their gills while jumping clear of the water once hooked. A heavy shock tippet of 40 to 60lb hard type mono is a good idea and it's advisable to check the tippet after each fish.
What flies to use
Pink Thing; White Thing; Fatboy; Bushpig; DK Dancer; Gold Bomber; Clousers; Black and Barred; Poppers and Dahlberg Divers
Baitfish imitations mainly but also prawn and crab flies. In turbid water think about bulky flies that push water.
Bright colours are good, pink is a good place to start. The bigger end of size 1/0 to 6/0 is preferred.
A Barra won't usually travel far from cover to attack a fly so the best presentation is as close to structure as possible. If the Barra is in the mood a reflex attack will be triggered however it may require several presentations to get a response (or get frustrated).
It vacuum sucks its prey and briefly 'feels' it in it's mouth before swallowing and turning back for the cover. If takes are being missed you might need to experiment with timing of the strike - sometimes a quick, short, strip and pause is necessary for success.
Most successful approach is 'snag bashing', which means casting the fly real close in amongst logs, trees, subsurface structure and also around gutter outflows in creeks.