Crocodiles filmed fighting over dead buffalo on Northern Territory river

A pair of crocodiles has been filmed battling to get a bite of a buffalo carcass on a remote river in the Northern Territory.

Darwin man Daryl Lehmann was returning from a fishing trip with his family on the South Alligator River on Sunday afternoon when his grandsons spotted the predators.

"They said, ‘look at those crocs’ and I quickly got the phone out," Mr Lehmann told 9NEWS.com.au

Video filmed by Mr Lehmann shows the predators approaching the floating buffalo, which he said had been earlier spotted by his son on Friday.

The pair of crocodiles then decide to attack each other, hurling their tails into the air and locking jaws as water splashes into the sky.

The experienced fisherman estimates the crocodile seen on the right of the video was "at least four metres long."

After just seconds of brawling, the duo of crocs are shown swimming away into the murky depths of the river.

Nearly 30,000 social media users have viewed Mr Lehmann’s footage on Facebook.