Police have charged a second person in relation to a boat rage incident at Tairua Wharf.

A 52-year-old woman has been charged with common assault and is due to appear in Thames District Court on Thursday, February 18.

A video of the incident has been posted to social media and shows a man in an inflatable boat ramming another boat, before an oar-wielding woman jumps into the water.

Footage of the January 23 confrontation has been widely shared on social media, including on the NZ Fishing Community Facebook page, and police and the local harbourmaster are investigating the altercation.

In the video, the man claims the woman's larger boat had broken the speed limit and caused $1000 of damage to his vessel.

After yelling and swearing between the pair, he rams the woman's boat, which has children on board.

She then wades over to him with an oar, getting a couple of swings in before a bystander takes it from her.

Earlier today a 58-year-old man was charged with assault and operating a vessel dangerously.

He is due to appear in Hamilton District Court tomorrow.

Sergeant Will Hamilton says police encourage people to consider the impact of the content they post on social media after the video was posted online.

'As the matter is before the courts Police will not be making further comment.”