Fly fishing here is snag fishing. Cod treat a big snag in a slow pool as home. Golden perch hang around the same timber but roam more, and move up onto shallower edges to feed as the water warms. The forage on record across these waters tells you what to tie on: bony bream, Australian smelt, gudgeons, hardyheads and Murray River rainbowfish, with Murray crayfish in the big rivers. A cod looking for a bony bream or a crayfish wants something bulky that pushes water. For golden perch, a pale baitfish pattern in size 4 to 8 does the job.
For cod, carry an 8 to 10 weight, a sinking or intermediate line and a short, stout leader. Cast past the snag, let the fly sink beside it, and bring it out slowly with long pauses. Most takes come as the fly first moves away from the wood, and a fish that gets back into it is usually gone, so keep the rod low and turn its head at once. After dark, a big surface fly worked slowly along a snag-lined bank is worth an hour.
Murray cod in the timber covers the method in detail.
Golden perch often take on the drop. If one follows and will not eat, stop the fly dead rather than speeding it up. A dark
Woolly Bugger crawled near the bottom is the workhorse, and on summer evenings a
hopper left to sit against a grassy bank finds them on top. Carp cruise the shallow insides of bends and take a small weighted nymph if you keep your shadow off them. On the Victorian lakes, redfin are the dependable fish: they school, so when one hits a small streamer, cast straight back to the same spot.
Trout cod are on record in the Murray, the Murrumbidgee, the Lachlan and Gunbower Creek, and they look a lot like a small Murray cod. Learn the difference before your first trip.