More giant swordfish have been tagged off the Tasmanian coast, including one which tipped the scales at 370 kilograms.

Several enormous specimens have been sighted and tagged in recent days while this possibly record catch was hooked and landed off St Helens in the state's north-east on Tuesday.

It was among a record number of the broadbill species appearing in Tasmanian waters and is being attributed to a warming of the ocean as the East Australian Current drifts southwards as far as the Tasman Peninsula.

"It was an absolutely enormous fish," said big game fish specialist and boat skipper Leo Miller.

"It was the biggest known recreationally caught swordfish in Australian history. It was weighed clean at 354 kilos, so it's probably about a 370 to 380 kilogram fish whole.

"It would have been the new Australian record."

In march last year, Tasmanian fishermen claimed a record for an amateur caught swordfish weighing 263 kilograms.

On Thursday, Miller tagged an almost 100-kilogram swordfish off Eaglehawk Neck.

"I have had inquiries from America, New Zealand, all round Australia and it's had recent exposure on TV programs," he said.

"It'll give the state and the fishery a huge boost and a huge bit of exposure. It's exciting times."

'We are the talk of Australia'

Miller said the signs pointed to swordfish staying in the area for a significant amount of time.

"We think these fish are part of the same population, the western Pacific population of fish that they also catch in New Zealand," he said.

"They've been doing the daytime swordfishing recreationally in New Zealand for over 10 years now and the fish have been showing the same kind of biomass every year.

"We do expect it to continue."

The swordfish barely fitted on the back of a ute. ( Facebook: Team Choonachasa )

The Tasmanian Association for Recreational Fishing's Mark Nikolai told a Senate inquiry in Hobart on Friday that at least 50 large swordfish had been caught in the last two years.

"This is a burgeoning fishery for Tasmania," he said.

"The meetings I have with my peers when I have to travel to Canberra and Sydney and the like, everybody knows about Tasmania's broadbill fishery at the moment, everybody.

"And they are coming down here with their boats, that includes trailer boats, also large game-fishing boats. We are the talk of Australia."

The Institute of Antarctic Studies is researching the species in Tasmanian waters.

"The IMAS guys satellite-tagged another three fish off St Helen's last week which is very exciting," Mr Miller said.

"Hopefully in six to nine months' time we'll know a lot more about the movements of these fish and where they're coming from, where they're going and what they're doing, so we can make sure there's still this magical fishery here in 50 years time and possibly develop into something as exciting as the Cairns marlin fishery has."