Tim Driesen, a two-time national hammer throw champion, and his partner Emily Nolan, an AIS coach, flung the fish the furthest, taking first prize in the men's and women's divisions of the contest on Sunday.

Part of the Tunarama Festival in South Australia, the Tuna Toss World Championships saw Mr Driesen lob the 10 kilogram frozen tuna more than 30 metres, while Ms Nolan pitched it just over 12 metres.

Mr Driesen said it was his first time throwing a tuna, which tied to a piece of rope measured nearly a metre long.

The hammer he usually throws is just over 7 kilograms.

''It's the same sort of technique, but it's a lot different, the weight is different, the length is different, how it's weighted is different, with a hammer it's all at the end of a wire,'' he said.

Mr Driesen said the pair had gone to Port Lincoln for a holiday and to have a go at the tuna toss, and had come away with $1000 in prizemoney each. ''It was good weekend really, a lot of fun. They had two other events that were entertaining to watch,'' he said.

At Tunarama, keg roll, beach body, watermelon eating and prawn peeling competitions were also on offer.

Mr Driesen, who grew up in Bendigo but has lived in Canberra for more than 10 years, said he was looking forward to competing in the national athletics championships in hammer throw in April.

''My first comp this year was as far as it was at the last comp last year, so it's been a good start so far to the season,'' he said.