One-hundred-kilometre-an-hour winds, more than 200 mm of rain and seas the size of three and four-storey buildings have eroded beaches, flooded estuaries and stirred up the food chain.

The impact will be most noticeable in the creeks, inlets and lakes. Systems that have been closed for years, including Wallaga, Wallagoot, Mummaga, Coila and Cutagee lakes, are now all open to the sea.

In the short term, the fishing will be very good around the mouths and the adjacent beaches as baitfish, prawns and other morsels are driven out to sea.

Cuttagee Beach in particular has a reputation for fishing extremely well around the lake mouth when it is open, with mulloway and sharks on the cards.

The flush-out will also reinvigorate the long-term fishing in these systems, especially when air and water temperatures start to rise.

In the meantime, the lower reaches of every estuary will be well worth a try this weekend for bream and blackfish, which relish the turbid water.

Surf beaches have copped a hammering from mother nature in July but they'll all fish better as a result.

The massive seas - a gargantuan 12-metre wave was recorded off Batemans Bay during the peak of the storm - have carved out plenty of new formations which will be well worth exploring for bream, salmon and tailor over coming weeks.

Closer to home, it's big cod time. Just don't expect them to come easily.

The anglers who are catching these fish at the moment are those prepared to get up early, stay up late and lay down 1000 casts in between strikes.

The Murrumbidgee River around Canberra has a few productive cod holes but their exact locations are well-guarded secrets. My advice is to get out and explore.