Rainbow trout is a Pacific salmon, which lives in cold water and is a different species from salmon. It is smaller than salmon in shape. Mature rainbow trout has brown-red longitudinal stripes along the lateral line, which looks like a rainbow, hence the name. After the rainbow trout was successfully cultured, it was sold as salmon by merchants because the market price was much cheaper than salmon, and some scenic spots also used "freshwater salmon" as a specialty to attract tourists.

Salmon, also known as salmon, salmon and salmon, belongs to bony fish, Salmoniformes and salmon. It is mainly distributed in the waters at the junction of the Atlantic Ocean, the Pacific Ocean and the Arctic Ocean. It is a cold-water highly migratory fish and is praised as the "Emperor of the Ice Sea" by the international food community. Studies have shown that tuna and salmon are delicious, nutritious and rich in bioactive substances such as EPA and DHA.

Morphological characteristics and habits of salmon

Salmon has a flat body, a convex back, sharp teeth and small scales. It is silvery gray with orange stripes when laying eggs. Salmon meat is tight and delicious, pink in color and elastic. Salmon is anadromous fish. After living in rivers for 1 ~ 5 years, living in the sea for 2 ~ 4 years, the spawning period is from August to 1 month of the following year. In the process of migrating upstream to spawn, they will jump over waterfalls and dams, and after a long journey, they can reach the spawning ground without feeding.

Every year from July to 10, thousands of salmon breed in Adams section of the upper Fraser River in Canada. Some birds eat eggs laid by salmon for their own survival.