Their location disparity and distribution make them very viable throughout large pockets of Australia. Stretching from Southern Queensland down through New South Wales, ACT and down into Victoria and South Australia. Existing in most rivers, Lakes and Dams from wee little ankle biters right up to 1.5m and beyond goliath beasts that have been known to eat the odd water bird!
They are a viable target almost year around, although some closed season are present to help prevent exploitation and stress in spawning times. QLD, NSW, ACT & VIC are closed to targeting them from September 1st to 30th November, SA has a more strict policy year around and has a closure from August 1st to 31st December. There are a few exemptions to these closures as scientific evidence suggests in some dams with little or no inflows breeding is not viable. While the fish still undergo the whole process as a natural urge the salinity levels and water flow make it a non-event. Copeton Dam in Northern NSW and Lake Eildon on the Victoria Border are two impoundments open to year around fishing and have quickly stamped their reputations as Murray Cod Meccas due to years of active stocking programs.
If the big open ponds are not your thing and those flowing snake like rivers of the western slopes and plains have the allure of attraction to chase Cod then you will need to do some homework. A quick search on the internet should reveal the quality of the Cod fishing available on the more well-known rivers or a call to the local tackle shop with nominal drop in and purchase of something should get a little point in the right direction.
Once you have a place in mind, it is time to have a crack during the peak time. Depending on location this can vary but on a whole, dawn and dusk are prime times for a big lazy green slob to start patrolling his beat for a tasty meal. That said some true trophy beasts get caught in the middle of the day, after all we eat three meals a day so why not the cod. Though in the summer months the flies, heat and the call from the cold beers in the esky make it all too hard for middle of the day fishing. The cooler months around the closure times are much more bearable and the fish seem somewhat active in these months putting on condition before and after spawning.