The scientific name of salmon is Atlantic salmon, also known as Salmon or Salmon. It is a marine fish, belonging to a kind of deep-sea fish. Salmon is a cold-water fish, which lives in fresh water and seawater. It is an anadromous fish. It originally lives in the northern Pacific Ocean, and only after living in the ocean for 3-5 years (usually reaching sexual maturity at the age of 4) does it migrate in groups in summer or autumn.

According to the upstream time, it can be divided into two biota, summer biota and autumn biota. Only autumn biota enter Heilongjiang in China, most of which spawn in the downstream, and only a few of them arrive in the upstream. They travel along the river day and night, working tirelessly, and can advance 30-35 kilometers every day and night. No matter whether they encounter shoal canyons or rapids and waterfalls, they do not retreat and rush through heavy obstacles until they reach their destination. After entering the freshwater breeding period, adult fish will not eat.

Habitat environment of salmon

Salmon spends most of its life in fresh water, usually inhabiting lakes and rock basins and ponds in small to large rivers. The suitable water temperature is 0~24 degrees Celsius, the optimum water temperature is 12~ 18 degrees Celsius, and it has strong high temperature resistance, with dissolved oxygen above 6 mg/L, PH tolerance range of 5.5~9.2, and suitable range of 6.5~7.5.

Euryhaline, with strong salt tolerance and benthic floating, has a depth of 0~2 10 m, usually 10~23 m. Young fish usually inhabit shallow areas with high dissolved oxygen and strong current and rough gravel as the bottom in the upper reaches of rivers and streams, while adult fish usually inhabit cooler waters with moderate or above current intensity.