PORT Lincoln's unique Swim with the Tuna business is closing after almost five years of bringing people up close to the region's famous southern bluefin tuna.
Owner Emma Forster said it would be sad it would no longer be in Port Lincoln but it had been great for the town.
"It's had a wonderful five years in Port Lincoln with some great support from the local community," she said.
"More than 38,000 people have been out on the pontoon.
"We had a live broadcast with Grant Denyer and Sunrise, we've had Merrick Watts, Brooke Hanson the Olympic swimmer, many, many TV shows, all the Crows boys and Port.
The business has been sold and there is an application to move the structure, along with the fish, to Victor Harbor but at this stage the last tour will be on October 13.
"If the application is successful I'm very confident the business will thrive over there given the close proximity to the metropolitan area," Ms Forster said.
The business was initially one of two local businesses offering a swim with the tuna experience but in recent years it has been the only one and its closure will mean the experience is no longer available in Port Lincoln.
Swim with the Tuna's last tour will be on October 13 and until then the business is offering half price tickets for locals to swim with the tuna for the last time.
"After having our fish for five years they're monsters," Ms Forster said.
"The biggest fish out there are up to 85 kilos so it's well worth a look."