The wild salmon is an anadromous fish, this means that it goes back to its own birthplace to lay its own eggs. The salmon has to swim from the ocean upstream in the river for which it needs quite some strength. Before he sets off to the mating grounds, the fish fills its belly to be able to make the trip. When caught at the start of its journey, the fish is caught at its fattiest. In total there are five kinds of wild salmon: chinook-, choho-, keta-, pink and sockeye salmon.