The water quality in mountainous areas is good, so it is best to raise slim fish. Four big fish can be bought in bulk and then sold several times. It is difficult to cultivate, with low cost and good sales. Rainbow trout is easy to raise. There are many rainbow trout in Huairou tourist area of Beijing, which has become a local specialty food. In mountainous areas, rainbow trout especially needs high water quality to survive, and the pollution-free environment of natural water creates a natural growth environment for rainbow trout. Personally, I think rainbow trout should be the priority species.

Why not raise one? As long as the source water is good and the amount of water is large, build a stepped fish pond, raise trout on the head and raise sturgeon in the water, because trout requires higher water quality than sturgeon, and it is required that there must be running water, so that the oxygen content in the water will not be low. Cold-water fish like to swim against the current, so there must be a lot of water. The particle size of feed will not only affect the intake of rainbow trout, but also affect their taste, and also have a great impact on the digestion and intestines of rainbow trout. Therefore, when feeding pellet feed, we must pay attention to the size of fish in each growth stage and feed some feed suitable for them.

It will not let the fish eat the feed better and waste it, and it will precipitate to the bottom of the pond in the future, which not only increases the amount of feed we put in, but also pollutes the whole ecological environment. Rainbow trout also has very high requirements for oxygen content in water. But remember not to use ice water to cool down because it has a very serious impact on the growth of fish. The temperature is particularly low in winter, so we should also do a good job of heat preservation in the pond. If the water temperature is too low, the growth of trout will be seriously hindered.

Crustaceans, small fish, shrimps, tadpoles and terrestrial insects that fall into the water can also eat artificially distributed granular feed under artificial breeding conditions. Rainbow trout has developed stomach, short intestine and developed pylorus. Swim fast, suitable for intensive cultivation and high yield per unit area. At present, there are more than 50 professional rainbow trout farms in China, which are located in Beijing, Heilongjiang, Shandong, Shanxi, Liaoning, Jilin, Shaanxi and other places.