Fish wheel salmon species Chinook, Chum, Coho, Sockeye, and Pink) and other anadromous species of fish, has given fish wheels their second name as "salmon" wheels. Although salmon were prioritized by commercial fishers and Indigenous peoples (albeit for different reasons,) other fish such as steelhead trout ("Oncorhynchus mykiss"), ooligan ("Thaleichthys pacificus"), and lamprey ("Lampetra tridentata") were also considered valuable catch. While the fish wheel is best known for its presence on the Northwestern coast of North America, there is debate whether the technology arrived via Asian migrants who had come to labor in the gold fields, by Scottish and Russian migrants, or
Fish meal be made from almost any type of seafood, but is generally manufactured from wild-caught, small marine fish that contain a high percentage of bones and oil, and are usually deemed not suitable for direct human consumption. The fish caught for fishmeal purposes solely are termed "industrial". Other sources of fishmeal are from bycatch and byproducts of trimmings made during processing (fish waste or offal) of various seafood products destined for direct human consumption. The main fish sources by country are: It takes 4 to 5 tons of fish to produce one ton of fish meal; about 6 million tons of