In a rare moment of uninhibited expressiveness, the Murray Cod has shown off some of its daily routine for the benefit of science.

The normally-reclusive river-dwelling cod gave up its secrets to New South Wales Department of Primary Industries cameras, placed in the Dumaresq River in northern NSW by an interstate team of fisheries researchers.

NSW Department of Primary Industries (NSW DPI), Fisheries NSW Scientific Officer, Dr Gavin Butler, said the footage gave an exciting and rare insight into the Murray Cod’s behaviour and natural habitat.

“The breeding behaviour of the Murray Cod has only ever been observed in man-made environments,” Dr Butler said.

“We were lucky enough to get great clearwater conditions in the Dumaresq River, near Tenterfield during a research trip that allowed us a rare opportunity to film a Murray Cod’s breeding cycle in the wild for the very first time.

“Murray Cod males are shy but very protective, getting the job of looking after the eggs and larvae for up to 25 days, including chasing away turtles and other fish.

“The rare footage also shows the male Murray Cod fanning the eggs to remove sediment and is a strong reminder of how essential good water quality is in providing high quality breeding habitat for this iconic native fish.

“This vision has allowed us to learn more about the breeding cycle of the great Murray Cod and will help develop strategies to promote further recovery of the species.”

Still photos and video footage have been cut into an immersive and gritty short film, which provides a unique insight into the life of the magnificent native fish.

The video features Brian Dare, known within the fishing community as 'The Cod Father'. Mr Dare provides a unique perspective on the lifestyles and behaviours of the introverted river-dweller.

“I have a passion for the Murray Cod and I was extremely excited to be part of this filming opportunity,” Mr Dare said.

“This important project was enabled through funding from the Queensland Murray Darling Committee, fisheries researchers from the NSW DPI and Queensland Department of Agriculture, Fisheries and Agriculture, some 80 keen anglers and a dedicated Glenlyon Dam Fish Restocking Group and close friends.”

The following film has been posted by Fisheries NSW.