Salmon is a general term for large salmon and trout in China. Pacific salmon, Atlantic salmon and golden trout have been cultivated. This paper mainly introduces the culture technology of Pacific salmon. Pacific salmon is a cold-water fish, its survival water temperature is 0 ~ 22℃, the optimum water temperature is16 ~18℃, and it can tolerate water temperature of 24℃ in a short time. Pacific salmon requires high water quality, so it is suitable to be cultured in fresh and pollution-free water, with mountain spring water, reservoir water and groundwater as the best. The PH value of the water is 6.5 ~ 7.5, ammonia nitrogen is less than 0.5mg/L, and nitrite is less than 0.5 mg/L.. Pacific salmon, like other salmon and trout, is not tolerant to hypoxia, and the dissolved oxygen in water is not less than 8 mg/L. The culture of Pacific salmon should be adapted to local conditions. If there is sufficient mountain spring water, reservoir water and water source, running water culture can be adopted. Without these conditions, if the groundwater quality is good, you can also adopt water-stopping and oxygenated cement pond culture. This culture method is introduced below.

1. Culture conditions 1 culture pond structure: the culture pond adopts a shed-room cement structure, and the roof can be covered with plastic sheets. Each cement pool in the shed has an area of 100 square meter and a depth of1.5 ~ 2.0 meters. There is a water inlet above the cement pool, a water outlet below, and a sewage drain in the middle of the bottom. Water source: it is best to use underground deep well water, if the iron content in the water is high, and a set of tower aeration iron removal equipment should be equipped. Water quality analysis should be done before water source is used. Inflating and generating equipment: a 7 ~10 kw blower. In addition, prepare another spare. In order to avoid power failure, a set of generator sets should also be prepared.

Second, preparation before stocking For the new cement pool, it should be soaked in water for 2 months before it can be used for breeding. The old cement pool should be disinfected with bactericidal drugs before the seed stocking 10 day before it can be used. Cement pool water injection 1 m depth.

Three, fry stocking 40 ~ 50 Pacific salmon with a stocking specification of 30 ~ 50g per cubic meter of water. Generally, after150 ~160 days, the tail weight can reach 900 ~1000g. Fish can be stocked in spring and April.

Fourth, feed is domesticated and fed with granular feed. The crude protein content of feed is 42 ~ 45%, and the feed particle size is 3.0 ~ 6.0 mm. When the water temperature is below 8℃, feed it twice a day, once at 8: 00 ~ 9: 00 am and once at 4: 00 ~ 5.00 pm. When the water temperature is 8 ~15℃, feed it three times a day and once at noon. Feed 80% full every time, that is, until most of the fish swim away.

V. Water temperature regulation Because Pacific salmon is a cold-water fish, it has strict requirements on water temperature. Its optimal growth water temperature is13 ~15℃, while the well water temperature is about 8℃. During the feeding period, two methods can be adopted to regulate the water temperature. First, when the temperature is low in early spring and late autumn, cover the scaffolding with plastic sheets to increase the temperature of the pool water. Second, in the summer when the temperature is high, remove the plastic sheets and reduce the temperature of the pool water by increasing the exchange capacity of well water. Through the above two methods, the lowest water temperature is not lower than 5℃ and the highest is not higher than 15℃, and the water temperature in spring and summer is kept at13 ~15℃.

6. Water quality adjustment During the feeding period, the pool water should be kept fresh, regularly discharged, and the water should be changed frequently. The number of water changes and the amount of water change should be flexibly controlled according to the changes of water temperature and water quality. Use a blower to continuously increase oxygen to the pool water, and stop gas supply only when feeding bait. The dissolved oxygen in the pool is kept above 8 mg/L.

Seven, fish disease prevention and control adhere to the principle of prevention first, during the breeding period, the pond water is disinfected with formalin and eel net in rotation, and the whole pond is splashed once every half month, with 20 grams of formalin per cubic meter of water and 0.5 grams of eel net per cubic meter of water.

Eight, daily management 1 someone who's in charge, patrol the pool all day, adjust the water temperature, adjust the gas supply, ensure adequate dissolved oxygen, and avoid fish floating head due to lack of oxygen; 2. Check the fish's body condition frequently, and check the fish's growth by sampling every half month; 3 make a good record of farming.