Tuna fishing in the Öresund was most active from the end of the 1940s to the beginning of the 1960s. After the mid-60s, rare tunas have been observed in the area. During World War II, fishing in the North Sea declined, which gave fish stocks the opportunity to recover. The tuna was protected from overfishing and migrated up via the Skagerack and Kattegat to the Sound, but did not reach further than Ven due to low salinity.

Two main methods were used for tuna fishing: rod fishing and barrel fishing. In rod fishing, a special chair was used to hold the rod, and a 400 meter special line was used. The fish were attracted with bait consisting of mackerel or herring. When nipping, the boat followed the tuna to avoid the line breaking. The tuna could weigh between 100 and 400 kg and was brought on board with the help of a hoist.

Fishing with a barrel meant that the line was attached to a barrel, which was thrown out into the water at a bite. The boat followed the barrel until it was brought into the boat to retrieve the fish. This required strong arms and protective gloves.