Rainbow trout Oncorhynchus mykiss and brown trout Salmo trutta have a long history of aquaculture and rainbow trout is one of the few species of fish which may be regarded as truly domesticated. Rainbow trout originate from western North America, while brown trout are native to Europe. In 1995, world aquaculture production of rainbow trout was approximately 360,000 tonnes, valued at approximately US $1.3 billion, while the total global production for all salmonids including smelts was approximately 943,000 tonnes and US $3.7 billion species whereas brown trout are generally grown only for recreational fishing.

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