New technology of culturing salmon

Salmon, also known as salmon or salmon, is one of the more commonly used fish ingredients in western food. let's take a look at the new techniques for culturing salmon.

I. Culture conditions

1 the structure of the culture pond: the culture pond adopts the cement floor structure of the shed, and the roof can be covered with plastic sheeting. The area of each cement pool in the shed is 100 square meters, and the depth is 1.5 to 2.0 meters. A water inlet is arranged above the cement pool, a drain is arranged below, and a sewage ditch is arranged in the middle of the bottom.

2 Water source: it is best to use underground deep well water, such as high iron content in the water, should also be equipped with a set of tower aeration iron removal equipment. Water quality analysis should be done before the use of water sources.

3 inflatable and power generation equipment: a 7-10 kilowatt blower. In addition, prepare another backup. In order to avoid power outage, a set of generator sets should be prepared.

Second, preparation before stocking

For the new cement pond, soak in water for 2 months before it can be used for breeding. The old cement pond should be disinfected with germicides 10 days before seedling stocking before use. The cement pool is injected with water 1 meter deep.

3. Stocking of seedlings

There are 40 tons of Pacific salmon with a specification of about 30 grams per cubic meter of water. Generally, the tail weight can reach 900 to 1000 grams after raising for 150 to 160 days. Fish can be released in April in spring.

IV. Feed feeding

The pellet feed was domesticated and fed. Feed crude protein content 4245%, feed particle size 3.0~6.0mm. When the water temperature is below 8 ℃, it should be fed twice a day, once at 8: 00 a.m. at 9: 00 a.m., and once at 4: 00 p.m. When the water temperature is 8-15 ℃, it should be fed three times a day and once at noon. Only 80% of the fish are fed each time, that is, most of the fish swim away.

V. Control of water temperature

Because Pacific salmon is a cold water fish and has strict requirements on water temperature, the optimum growth water temperature of Pacific salmon is 13-15 ℃, 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 sheeting to increase the temperature of the pool water. Second, in the summer when the temperature is high, remove the plastic sheet and reduce the temperature of the pool water by increasing the exchange volume of well water. Through the above two methods, the lowest water temperature is not less than 5 ℃, the highest water temperature is not more than 15 ℃, and the water temperature is kept at 13-15 ℃ in spring and summer.

VI. Water quality regulation

During the feeding period, the pool water should be kept fresh, sewage should be discharged regularly, water should be changed frequently, and the times and quantity of water change should be flexibly mastered according to the changes of water temperature and water quality. The blower is used to continuously increase oxygen to the pool water, and the air supply can only be stopped when feeding the bait. The dissolved oxygen in the pool water is kept above 8mg/L.