Culture techniques of Salmon

Salmon, also known as salmon or salmon, is mainly distributed in the northern Pacific Ocean and the northern parts of Europe, Asia and the Americas. The salmon has flat sides, protruding back, sharp teeth, fine scales, silver gray and orange stripes during spawning. The salmon meat is compact and delicious, pink and elastic. Norway has the largest production of salmon and is very famous. But the best quality salmon comes from the waters of Alaska in the United States and England in the United Kingdom. Salmon is one of the more commonly used fish ingredients in western food.

Culture condition

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, and should 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.

Preparation before stocking

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

Seedling stocking

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.

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. 5. Water temperature control because Pacific salmon is a cold water fish, the requirement of water temperature is relatively strict, the best growth water temperature 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.

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.

Prevention and control of fish disease

Adhering to the principle of giving priority to prevention, the pond water was disinfected in rotation with formalin and eel net during the culture period, using the method of sprinkling the whole pool once a month, 20 grams per cubic meter of water for formalin and 0.5 grams per cubic meter for eel net.

Daily management

1. Special personnel are responsible for patrolling the pond throughout the day, regulating the water temperature, adjusting the air supply, ensuring sufficient dissolved oxygen and avoiding fish floating due to hypoxia.

2. Check the condition of the fish regularly and check the growth of the fish once a month.

3. Keep a good record of breeding.