Sea Shepherd targets tuna fishing.
The Sea Shepherd conservation group's ship the Steve Irwin has left Hobart with the goal of protecting bluefin tuna in the Mediterranean Sea.
The Convention on International Trade in Endangered Species (CITES) is meeting in Qatar this week and will vote on whether to list the bluefin tuna as endangered and restrict catches.
The Steve Irwin has refueled and resupplied after what its crew calls its most successful campaign to date against Japanese whalers in the Southern Ocean.
Captain Paul Watson says with the whaling season over it is time for the next campaign.
"Our plans for the tuna campaign is to go to the Mediterranean, because the blue fin tuna is now going to be put on the endangered species list with CITES," he said.
"Our objective is just to directly intervene their fishing operations. So if we catch anybody illegally fishing tuna, we'll cut their nets and release their tuna."
The Sea Shepherd ship the Bob Barker will leave Hobart at the end of the month.