Peng Zeyu's Autumn Breeding Technique
First, broodstock selection
Choose broodstock that has spawned in the spring and summer of the year and has an individual with more than 400 grams.
Second, broodstock breeding
In order to reproduce again in the autumn in Pengze salmon which has already laid eggs in spring and summer, the broodstock must be cultivated in summer.
1. The pro-fish pond is generally 2 mu to 3 mu per pond with a water depth of 1.5 to 2 meters.
2. Stocking density 300 kg/mu - 400 kg/mu.
3. Feed the artificial diet with a protein content of about 30%. The daily feed amount is about 3% to 5% of the fish's body weight, and it is flexible depending on the feeding conditions of the fish.
Third, artificial labor
Peng Zeqi can lay eggs on his own in the autumn, but he can't synchronize. In order to get large quantities of autumn juvenile squid, he must use artificial oxytocin. 1. Peng Zeyi's autumn breeding time: From late September to mid-October, it is appropriate that the water temperature does not exceed 30°C.
2. Artificial oxytocin production: According to the number of fry required to determine the number of broiler broodstock, generally 10,000 to 20,000 tails per female. The selected broodstock is injected with LRH-A + DOM, and the ratio of male fish is 2:1, preferably 1:1. The injected broodstock is returned to the original pond or another pond with an area of ​​1,000 square meters to 2,000 square meters is prepared as a spawning pond.
3. Spawning: The fish nests are hung around the spawning pool and the fish nests are promptly exchanged according to the spawning of the broodstock to avoid excessive density of the eggs. The spawning pool preferably has micro-flowing water.
Fourth, fry hatching
1. Higher water temperature in autumn, salmon eggs can be hung directly in the fry pool. The fry pool area is generally 1,000 square meters to 2,000 square meters. The water depth is about 1 meter, and the stocking density is controlled between 500,000 and 1 million. It is necessary to add fresh water through the clear pond to prevent the wild fish from mixing into the hatchery.
2. When the water temperature is between 27°C and 28°C, hatching fry can be fed with soya milk or fish for sale on the third day. Pengze’s broodstock injected with oxytocide can be fertilized naturally by Dachi. In general, a small amount of broodstock laid eggs in the early morning on the second day after the injection of oxytocic agents, and a large number of broodstock laid eggs in the third or fourth day, and the fertilization rate reached more than 85%. The hatching rate of the fry in the large pool reached more than 90%. Salmon is a spawning fish many times a year. Pengze squid, which has already laid eggs in spring and summer, has been intensively cultivated and will be breeding again in the fall. After the injection of oxytocin, a large number of squid were placed on large ponds (1 mu to 3 mu), micro-flowing water was maintained, and spawning was synchronized and the fertilization rate was high within 3 to 5 days. This approach can also be adopted in the spring to obtain a large number of salmon fertilized eggs. Fertilized eggs naturally hatch in large ponds, which is simple and convenient, and has a high egg-bearing rate. It can also be cultivated and sold according to the needs of farmers. The breeding of eel fry in the autumn has been cultivated. In the spring of the second year, it will become a larger-sized fish species with a body length of 3 cm to 5 cm. The market is optimistic and it is easy to obtain better economic benefits.
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