Sea lampreys prey on all types of large fish such as lake trout and salmon. Most seafood, such as tuna, salmon, and squid, are served raw. The river is home to several varieties of Pacific salmon and trout. They are most common on fish with soft fin rays, such as salmon and carp. The Nechako is home to a number of fish species, including salmon and sturgeon. Sapporo is also well known for fresh seafood including salmon, sea urchin and crab. Roe is also extracted from herring, salmon, and sea urchins. Its DHA content is roughly equivalent to that of salmon based fish oil. Billions of salmon and herring eggs were also killed. The smokeries also produce other specialities including smoked salmon and bacon. By 1908, there was widespread concern about the decline of salmon and sturgeon. The eggs of a female salmon are called her roe. Chinook use larger sediment (gravel) sizes for spawning than other Pacific salmon. The Salmon and Freshwater Fisheries Act was passed in 1975. Each episode focuses on one particular meal, such as baked salmon or hamburgers.