Two hours later my next bluefin encounter is just that - hyper-fresh, melt-in-your-mouth sashimi served at Del Giorno's cafe overlooking the Southern Hemisphere's largest commercial fishing fleet at Port Lincoln, South Australia, west of Adelaide. At the very tip of the shark-tooth-shaped Eyre Peninsula that bites into the nippy Southern Ocean, it's a diverse, rugged, pristine and little-known destination, even among Australians.