Some of the Murray Cod fingerlings that were released into Gungahlin Pond?as part of the ACT Fish Stocking Plan.

Some of the Murray Cod fingerlings that were released into Gungahlin Pond as part of the ACT Fish Stocking Plan. Photo: Supplied

From tiny things enormous things may grow, in the mysterious, Loch Nessy waters of Gungahlin Pond in Canberra's north.

On Tuesday 6000 excited Murray cod fingerlings were liberated there by officers of the Environment and Sustainable Development Directorate.

The fingerlings are only four to seven centimetres long now, but if they are ambitious they may have as their role models some of the shark-size cod which their species famously swells to. Cod of 15 to 20 kilograms are commonplace (albeit perhaps not in relatively small habitats like the pond) while the biggest cod officially recorded, a cod that passeth all understanding, was a leviathan of 113 kilograms. It was 183 centimetres long. It's a jungle out there, in the pond, but Ben Ponton, acting director of the Environment and Sustainable Development Directorate, says four to seven centimetres is the ''optimal size'', because its means they are ''past the high mortality of larval-stage fish'' eaten by everything.

And so, enough of the cod should survive to spruce up and effervesce the carp-spoiled biodiversity of our local waterways (and those waterways will be receiving 100,000 golden perch in the next few weeks).

They will take about four years to reach their legal angling size.