Salmon is a spawning fish many times a year. Pengze squid, which has already produced eggs in spring and summer, will be reared again in the fall for further breeding. In the spring of the second year, the eel fry which has been propagated in the spring has become a larger-sized fish species with a body length of 3 cm to 5 cm. The market is optimistic and can achieve better economic benefits. When breeding in the autumn, a large number of squid after injection of oxytocic acid are placed in large ponds (1 mu to 3 mu), microfluidic water is maintained, and spawning can be synchronized and the fertilization rate is high within 3 days to 5 days. This approach can also be adopted in the spring to obtain a large number of salmon fertilized eggs. Breeding households can also be cultivated and sold according to their needs.
First, the broodstock choose to choose the spring and summer of the year have been spawning, individuals more than 400 grams of robust broodstock.
Second, the broodstock cultivation In order to make spring and summer eggs have been produced in Pengze squid breeding again in the fall, 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 feeding amount is 3% to 5% of the fish's body weight, which can be flexibly controlled depending on the feeding conditions of the fish.
Third, artificial priming Peng Zexi can spawn in the fall, but can not be synchronized, to get large quantities of squid Qiu Miao, must be artificial oxytocin.
1. Autumn breeding time
From late September to mid-October, the water temperature should 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 per female. The selected broodstock is injected with LRH-A+DOM in a ratio of 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 Fish nests are hung around the spawning pool. Attention should be paid to observation so that fish nests can be exchanged promptly according to the spawning situation of the broodstock to avoid death caused by excessive egg density. The spawning pool preferably has micro-flowing water.
Fourth, fry hatching
1. Higher water temperature in autumn, salmon eggs can be directly hung in the fry pool hatch, fry pool area is generally 1,000 square meters to 2000 square meters, water depth of about 1 meter is appropriate, stocking density control in 500,000 to 1 million tail. Before the catfish eggs hatch into the pond, the pond must first be filled with fresh water. When adding new water, use a three-layer filter to prevent wild fish from mixing into the hatchery and swallow fish eggs and fry.
2. When the water temperature is between 27°C and 28°C, the hatching fry can be fed with soymilk or sold 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 of the morning after the injection of oxytocic acid, and a large number of broodstock laid eggs in the third and fourth days, and the fertilization rate was as high as 85%. When hatching fry in large ponds, the hatching rate reaches more than 90%.
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