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Salmon farming techniques
Salmon is the general name for domestic large-sized squid, and the province has now carried out cultivation of Pacific salmon, Atlantic salmon, and golden oysters. Here mainly introduces the Pacific salmon breeding technology. Pacific Salmon is one of the world's most famous high-grade cold-water fishes. It is also a fine variety cultivated in Europe, America and other countries. Its meat is delicate, delicious, nutritious and rich in DHA. It is a raw fish fillet and smoked. , roasts, hot pots and traditional cooking ingredients. Pacific sea bream is a cold-water fish, the survival temperature is 0 ~ 22 °C, the optimum water temperature is 16 ~ 18 °C, a short time can tolerate water temperature 24 °C. Pacific oysters have higher water quality requirements and should be cultured in fresh, pollution-free waters. Mountain spring water, reservoir water, and groundwater are good. PH values ​​for water bodies are 6郾5～7郾5, and ammonia nitrogen is less than 0郾5mg/L. Nitric acid is less than 0郾5mg/L. Pacific salmon, like other squid species, is not tolerant to hypoxia and the dissolved oxygen requirement of the water body is not less than 8 mg/L. The cultivation of Pacific salmon should be based on local conditions. If there is sufficient spring water, reservoir water, and sufficient water sources, it can adopt flow culture. Without these conditions, if the groundwater quality is better, a waterstop and oxygenated cement tank culture may also be adopted. The following describes this breeding method. 1. Breeding Condition 1 Aquaculture pond structure: The culture pond adopts the cement structure of the greenhouse, and the roof can be covered with plastic sheeting. Each concrete pool in the shed has an area of ​​100 square meters and a depth of 1 to 5 to 2 to 0 meters. There is a water inlet at the top of the cement pool, a drain at the bottom, and a drain at the bottom. 2 Water source: It is best to use underground deep well water. If the water contains high amounts of iron, it should also be equipped with a tower aeration iron removal equipment. Water quality analysis should be done before water sources are used. 3 Inflatable, power generation equipment: one 7 to 10 kW blower. In addition, prepare another standby. In order to avoid power outages, a set of generators should also be prepared. 2. Preparation before stocking For the new cement pool, use water for 2 months before soaking. The old cement pool should be used after disinfection with bactericidal drugs 10 days before stocking. Cement tank water injection 1 meter deep. 3. 40 to 50 tails of Pacific cockroach with a stocking size of 30-50 g per cubic meter of water. Usually raised 150 to 160 days, the tail weight up to 900 to 1000 grams. Fish species can be stocked in the spring of April. 4. Feed feed uses pelleted feeds for domestication and feeding. Feed crude protein content of 42 ~ 45%%, feed particle size 3 郾 0 ~ 6 郾 0mm. When the water temperature is lower than 8°C, it is fed twice a day, once in the morning from 8:00 to 9:00, and once in the afternoon from 4:00 to 5:00. Water temperature 8 ~ 15 °C, feeding 3 times a day, at least once at noon. Every time you feed 80% full, that is, most fish swim. 5. Regulation of water temperature As Pacific salmon is a cold-water fish, the water temperature is more stringent. The best growth water temperature is 13-15°C, and the well water temperature is about 8°C. During the rearing period, two methods can be used to regulate the water temperature. First, when the temperature is low in early spring and late autumn, the scaffolding is covered with plastic sheeting to increase the temperature of the pool water. The second is to remove the plastic cloth in the summer when the temperature is high, and to lower the temperature of the pool water by increasing the exchange of well water. Through the above two methods, the minimum water temperature is not lower than 5°C, and the maximum temperature is not higher than 15°C. The water temperature in spring and summer is maintained at 13-15°C. 6. Water quality regulation During keeping, keep the water in the room fresh, regularly pollute the water, change the water frequently, change the number of water changes, and change the amount of water depending on the water temperature and water quality changes. With a blower, oxygen is continuously supplied to the pool water, and the air supply is stopped only when the feed is fed. Dissolved oxygen in the pool was kept above 8mg/L. 7. The prevention of fish diseases adheres to the principle of prevention. During the breeding period, the two pools of drugs, formalin and quinone, are used to disinfect the pool water. The whole pool is used for spilling. Once every half month, formalin is used. Use 20 grams of cubic meters of water and 0 to 5 grams of water per cubic meter of water. 8, day-to-day management 1 special person responsible for all-day patrol pool, regulate water temperature, adjust the amount of gas supply, ensure adequate dissolved oxygen, avoid fish due to lack of oxygen floating head; 2 often check the status of fish, every half a month to check the growth of a fish ; 3 Make a good breeding record.