Salmon, also known as salmon or salmon, is mainly distributed in the northern Pacific Ocean and the northern regions of Europe, Asia and America. Salmon has a flat body, a raised back, sharp teeth, small scales, silvery gray, and orange stripes during spawning. Salmon meat is compact and delicious, rich in oil, pink in color and elastic. Salmon production in Norway is the largest, and it is also famous.

Salmon is large in size. Adult fish are generally 0.8- 1.6 meters long and weigh about 5-20 kg/fish, with few spines and orange flesh. However, rainbow trout is much smaller, each adult fish generally weighs 1.5 kg, and the meat is white.