Washington designated steelhead trout (Salmo gairdnerii) as the official state fish in 1969. Fishing is a major industry in Washington state (and steelhead trout is one of the most popular fish for recreational fishing).
Steelhead trout have a gray spotted back from head to tail with scales that shine with flecks of silver. This dark back is contrasted by an intense white belly - the two colors are separated by a hint of opalescent pink. Like salmon, steelhead trout are an anadromous fish (returning to fresh water rivers to spawn).