The challenge will be held over 36 hours from Friday, June 28 with the winning team snagging themselves a $5000 prize.

A catch, photo, release event, the challenge has already attracted more than 65 teams.

Among the Parkes entries in the challenge are a team from Parkes Optical Service made up of Aaron Huppatz, Paul Dunford and Brenton Hartin, as well as a team from Parkes 4x4 & Outdoors consisting of Mick Haydon, Brad Niven and Aiden Gaffey, and team Chasin' Tail with Mitch and Nathan Skeers and Brad Gardiner.

There are also teams from Forbes and Grenfell.

The competitors will be hoping to land the biggest Cod during the competition period and the $5000 first prize.

"The anglers will be casting or trolling hard to nail that monster from Friday night following the briefing through to 8am Sunday morning when we break for a catered breakfast and then the presentation to the winning team," organisers said.

After the presentation one lucky contestant also has the chance to win $5000 worth of fishing tackle and accessories.

Aaron Huppatz said it will be an interesting competition with the Cod Challenge taking place at Wyangala for the first time and given that the dam is at 26 per cent capacity.

His team will have to be quite strategic, given that they'll be contending with mud in the water because levels are so shallow and having to rely on noise lures to attract the Cod.

It's their first time entering the challenge, changing it up from the Yellow Belly Series they usually take part in.

"It's the fish of 1000 casts - Cod are very hard to catch," Aaron said.

"This (challenge) is the longest fish, in the Yellow Belly Series, it's your best 10-15 fish.

"So there's a little bit of luck in it."

Aaron's been entering fishing competitions since 2012, and Brenton for the last three to four years.

"I'm a competitive person," Aaron laughed.

"But it's good to get away with your mates... It's still more about catching the fish than winning."

When the frost starts to bite so to do the Murray Cod at Wyangala Dam.

According to fishing expert Garth Collins "this is the time when all the big fish get caught".

The water level might be falling but catches of one of Australia's most popular fish, are rising at Wyangala which is now sitting at 26.6 per cent of capacity.

"Traditionally from the first frost of the winter on the ground is the time to start fishing for the big cod," Mr Collins said.

"It's a bit of an old fishersman's myth but there's some truth to it.

"There's a lot of action just after dark, during the day is fine, but they really are starting to bite when the sun sets."

Mr Collins said one his customers, Steve McAuley landed five big Murray Cod earlier this month, the biggest more than one metre long.

"No one weighs them these days as most people are fishing for sport and its a case of catch and release," he said.

The legal size for Cod is 55cm to 75cm. Anything under or over that fishermen are required to release.

"Fishing has changed, there's practically none of this catch and kill anymore, except with a few old timers," Mr Collins said.

"For most people it is a sport and they release them. They realise if they keep taking them out of the water it is going to make it harder in the long run to catch a good fish."

The biggest catch Mr Collins has heard of in the past six months at Wyangala was a 1.26 metre Cod.

"There are also a few getting caught in the Lachlan," he said, "but not in the same numbers as the dam where they are being caught in all areas from the main basin and up the connecting rivers".

And what are the Cod being lured to.

"They're catching them on lures, bait, it doesn't really matter at the moment.

"I had a mate fishing from a kayak (Steve McAuley) who ended up with five, one at 65cm, one at 75cm, two at 95cm and one just on a metre fishing up the rivers.

"They're a beautiful majestic fish, to land one you have got to set your drag, have the right gear and be patient with them.

"A one metre cod could take anywhere from five minutes up to 25 minutes to land, it just a matter of tiring them out," he said.

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