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(1) Breeding conditions (1) Structure of aquaculture pond: The culture pond adopts a cement pool structure of a greenhouse, and the roof can be covered with a plastic cloth. Each concrete pool in the shed has an area of ​​100 square meters and a depth of 1.5-2.0 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 and power generation equipment: 1 set of 7000--10000 kW blowers. In addition, prepare another standby. In order to avoid power outages, one generator set should also be prepared.
(II) Preparation before stocking New cement pools should be used for water cultivation after soaking in water for 2 months. The old cement pool should be used after disinfection with bactericidal drugs 10 days before stocking. Cement tank water injection 1 meter deep.
(3) Seeds of 40 to 50 Pacific pacific fishes with a stocking size of 30--50 g per cubic metre of water. Usually raised 150--160 days, the tail weight up to 900--1000 grams. Fish species can be stocked in the spring of April.
(d) feed feed pelleted feed domesticated feeding. Feed crude protein content 42% - 45%, feed particle size 3.0 - 6.0 mm. When the water temperature is lower than 8°C, feed 2 times a day, and feed 1 time every morning at 8:00- 9:00 and 4:00-5:00. When the water temperature is 8-15°C, feed 3 times a day and feed 1 time at noon. Feeding 80% full each time, that is, most fish swim.
(5) Water temperature regulation Because Pacific salmon is a cold-water fish, the water temperature requirement is relatively strict. During the rearing period, two methods can be adopted 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 should not be lower than 5°C, and the maximum temperature should not exceed 15°C. The water temperature in spring and summer should be kept at 13-15°C.
(6) Water quality regulation During keeping, keep the pool water fresh, regularly discharge the sewage, 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.
(vii) Prevention and control of fish diseases should be based on the principle of prevention. During the breeding period, two kinds of drugs, formalin and quinone, can be used to disinfect the pool water, and Quanchiposa should be used. Once every half month, Formosa should be used. Lin uses 20 grams per cubic meter of water and 0.5 grams per cubic meter of water.
(8) Routine management (1) Person in charge shall be responsible for patrolling the pool throughout the day, regulating water temperature, regulating air supply, ensuring sufficient dissolved oxygen, avoiding fish floating due to lack of oxygen, (2) checking the status of fish regularly, and sampling every half month. 1 fish growth; (3) make a good record of breeding.
Pacific Ocean cement pond breeding technology
Pacific seabass are cold-water fish, and their survival temperature is 0--22°C, and the optimum water temperature is 16--18°C. Pacific salmon require higher water quality, and should be cultured in fresh, pollution-free water. Mountain spring water, reservoir water, and groundwater are preferred. The pH of the water body is 6.5--7.5, and the ammonia nitrogen is less than 0.5 mg. L, nitrous acid is less than 0.5 mg/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.