A Brisbane man has become the first person in the world to complete — and win — all six royal grand slams of game fishing.

Matt Price from Boondall, north of Brisbane, gained the record in July but had to recontest a category last month to confirm the world title.

To win the International Game Fishing Association (IGFA) royal grand slam, a fisherman must catch a variety of fish in six categories.

There were more than nine fish to catch in each category, which included freshwater species, shark, tuna, and salmon.

The International Game Fishing Association asked Mr Price to complete the billfish category again.

"No-one else in the world has done it, so I wanted to make sure it was legit and all done right," he said.

"Some of the fish were a pain in the neck to catch, with some fish taking eight different trips to three different countries to catch them."

Matt Price receives his blue marlin flag while chasing the grand slam overseas. ( Supplied: Facebook )

It took Mr Price since 2008 to catch each of the fish needed to complete the grand slam.

"Catching the final fish was amazing; I got really emotional and was crying with happiness," Mr Price told 612 ABC Brisbane's Spencer Howson.

The billfish royal slam club certificate from the International Game Fish Association. ( Supplied: Matt Price )

"If Federer can cry when he wins a grand slam, then I can do the same when I complete a royal grand slam."

To verify each catch, photographs and an affidavit were needed as proof.

Mr Price did not keep any of the fish he caught while chasing the title.

"I enjoy the fun of the fight, not the thrill of the kill," he said.

To catch each species, Mr Price had to travel across the world, including to the US and Venezuela.

"There was an American hot on my tail but I confirmed the other day that the other guy hasn't submitted any further catches," he said.

"I really wanted to be the first in the world to have all of the slams."

Cynthia Stevens, Mr Price's partner, was the first female and first visually-impaired person in the world to win an IGFA royal grand slam in the freshwater category.

Fishing for Freedom

Game fishing is a popular sport in America and Mr Price was already fielding calls from international media organisations.

He said he hoped the attention he would gain from being a "world-first" would allow him to raise money for his non-for-profit organisation, Fishing for Freedom.

The organisation takes people with disabilities and returned soldiers with post-traumatic stress disorder (PTSD) on fishing trips.

"I took a disabled guy out yesterday and a woman recently who didn't have any arms who was able to hold the rod with her foot," he said.

Mr Price said he also hoped corporate sponsors would buy space on his shirts and boat ahead of any appearance he may have on international television.