On March 1st, in the fish breeding base of Baihe Village, Shuangsheng Town, Yilong County, technicians explained to villagers how to cultivate broodstock in the spring.
The spring temperature slowly rises, and the pro-fish species gradually enters into a good time for feeding and growth. Grasping the breeding and management of the broodstock at this time can promote its early diet, restore constitution, accelerate growth, enhance disease resistance and increase survival rate, and promote gonadal development. It lays a good foundation for the breeding of broodstock.
Recently, in front of a fish pond in the three groups of fish farming bases in Yuming Village, Lime Township, Yilong County, Hu Zhaojun, head of the aquaculture station of the Water Affairs Bureau of the county, explained to the villagers how to cultivate spring broodstock, answering questions from villagers. problem. To this end, he particularly reminded the farmers of the need to pay attention to the following five aspects
Pooling
The main purpose of the stocking of broodstocks is to promote gonad development, generally using polyculture, which can make full use of water space and feed resources. In order to grasp the growth and development of broodstock and to facilitate oxytocin production, the broodstock originally concentrated in larger ponds should be transferred to a small pond for cultivation at a water temperature of about 10°C.
Disinfection of small ponds should be done well before the pooling. Select 100 liters of quicklime per acre for the sunny days. When dividing the pool, the broodstock that grow well and the broodstock with poor growth and development should be kept open, and the stocking density should be 120-150kg per mus, and the broodstock in each pond can be used up when the urine is released. the best.
Fertilization
After the water temperature rises in the spring, the broodstock is in a stage of rapid growth and development and requires a lot of nutrients.
The broodstock of the squid is cultivated in the spring and is mainly fed with fertilized and cultivated food organisms. Dissolve the base fertilizer in the pool before pooling, and apply 300-500 kg organic fertilizer per acre pond. The squid brood pool should be given more manure, and the scorpion fish pond should be given more excrement. The amount of topdressing should be less than once in order to stabilize the water quality so that the pool water is both "live" and "fat", and the transparency is about 30 cm.
The spring cultivation of grass carp broodstock should be dominated by green material, supplemented with fine material. Pre-feeding of grain buds, malt, buckwheat cakes, etc., and early feeding of lettuce leaves, ryegrass, etc., and then transferred to only cast green feed. Near the ovulation period, the food intake of gonads of mature grass carp will be significantly reduced or even stopped feeding. Grass carp broodstock is mainly fed with snail meat supplemented with bean cake or compound feed.
In order to improve the breeding effect, it is generally required to feed a fully-fed artificial compound feed in order to enhance the body composition of the fish and accelerate its growth.
When the water temperature on the surface of fish ponds rises to about 10°C, fish begin to feed a small amount and they can start feeding. The amount of feeding should be increased or decreased according to the water temperature and the feeding and feeding conditions of the broodstock.
Adjust water quality
After the spring, the depth of the pool water is controlled at about 1 meter, which will help the water temperature rise, promote the growth and reproduction of food organisms, and also be beneficial to the feeding of broodstock.
Pro-fish ponds should always be flushed with fresh water to keep the water fresh and increase the amount of dissolved oxygen in the water. Before the spring feeding and fertilization, the old water in the pool should be replaced by half, and new water should be added to maintain the water depth at about 1 meter. This will help increase the temperature of the pool water and the energy conversion of the pond and promote the growth and development of the broodstock. At the same time, flushing in spring is also an important measure to promote gonad development in broodstock.
The brood brood pool is generally flushed twice a month. The brood brood pool is flushed twice a month, each time adding 5 to 10 centimeters of water; before puerperium, the brooders and brooders are flushed once every 1-2 days. Or make the water into a micro-fluid state, and the grass broodstock flushes water once a day for 2-3 hours in the first half of the month before the birth.
The entire cultivation process of the grass broodstock should keep the water fresh and its transparency should be kept above 35 cm.
Strengthen management
In sunny days, it is necessary to drain water in time to reduce the water level in the fish pond and accelerate the water temperature in the fish pond. When rainy days or cold air comes, it is necessary to fill the pool water in advance to slow the cooling of the pool water. Regularly clean and clean food platforms to prevent and control diseases.
When the new water is added, blocking facilities should be installed to prevent the enemy from entering the broodstock. It is necessary to cultivate broodstock, full-time staff, and feed for special purposes. The management must be strict and rigorous. Every morning and evening, you must inspect the water, observe the fish condition, check whether there is any increase or decrease in the amount of fish, and the situation of water quality. To determine the amount of feed and fertilizer.
If panpool warning or severe floating heading is found, new water or aerator must be added immediately.
Disease prevention and control
The occurrence of broodstock in spring is due to the operation of fish ponds and stocking on the one hand, which causes mechanical damage to broodstock and opens up channels for bacterial invasion. This type of fish disease mainly includes saprophytic disease, vertical scale disease, and gill disease. In addition, diseases such as red skin disease, acne, and print disease can also occur. On the other hand, the broodstock in spring is overwintering and the constitution is weak. At this time, certain parasites occur in large numbers and can invade the fish.
Therefore, in the spring, we must implement the principle of “prevention from prevention, prevention and controlâ€. In the spring of each spring, 20 kilograms of quicklime are sprinkled with water to adjust the water quality and enhance the buffer capacity of the water body. If parasites occur, copper sulphate and ferrous sulphate may be sprayed with the agent water. When a disease occurs, professional technicians should promptly make a diagnosis and apply medicine to the disease.
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