Rainbow trout is far less fatty than salmon, rainbow trout thickly sliced will not be able to chew, so rainbow trout sashimi mostly sliced thinly and thinly, salmon is soft and tender in the mouth, while the rainbow trout is more chewy.

Rainbow trout is biologically related to Pacific salmon, and its meat is similar in color to that of Pacific salmon, and because it is a freshwater fish, it is easy to farm and less costly, so the businessmen call rainbow trout salmon for the sake of profit, and even call it "freshwater salmon," which is very inappropriate.

The name salmon first came from Hong Kong, and is the Cantonese translation of the English word "salmon," which is derived from the Latin word "salmo.

The original meaning is a kind of salmon in the North Atlantic Ocean, which migrates to the upper reaches of rivers along the coast of Europe to spawn every year. Since this kind of fish will fight to leap up the waterfalls and go upstream in the process of migrating, people use the Latin word "salmo" (meaning to fight to leap) to refer to this kind of fish.

Later, similar fish were found along the Pacific coast, so people called the former Atlantic salmon and the latter Pacific salmon in order to distinguish them. As the Atlantic salmon can spawn many times.

While the Pacific salmon can only spawn once and die soon after spawning. Therefore, the Atlantic salmon has a greater value than the Pacific salmon, and even in the early 20th century became the mainstay of the marine fisheries industry in Europe and the east coast of North America.