Affected by the traditional breeding mode, adult rearing of fingerlings for adult culture is still the main mode of stocking in many parts of China. However, in view of the situation in different places, the same is true for spring fish species. The stocking effects and breeding conditions are far apart. Apart from the differences in breeding techniques and breeds, some farmers have neglected some of the technical aspects of stocking, resulting in stocking. And cultivation results are not ideal. Doing a good job of releasing spring fish and raising the survival rate of stocking can lay a good foundation for the production of the whole year. Now we will introduce some issues that should be paid attention to in the spring release of fish species, and hope to learn from the farmers.
1, pay attention to the clearing of the pond
Many farmers save money and effort, and do not pay attention to the clearing of fish ponds before they are stocked. This practice will cause serious hidden troubles in the whole year's production, resulting in poor control of the water quality in the production season, serious diseases, and some even in the rainy season, due to embankments, causing damage. Therefore pond cleaning is essential. The correct method is to catch fish in the winter, drain the pool water, clear the pool of debris, remove excess silt, reinforce the pool, then expose it to the sun and freeze to kill pathogens. 15 days before stocking, the fish should be given a small amount of water, and then be splashed with quicklime of 75 to 100kg/mu or bleached powder of 5 to 7kg/mu.
2, pay attention to grasp the timing of stocking
The timing of stocking not only affects the growth period of the fish, but also affects the survival rate of the stocking. The correct time for stocking should be 7-8°C in spring. At this time, the fish scales are tight and their vigor is weak. Fish are not easily injured and the survival rate is high. The stocking is too early, the weather is cold, and it is easy to frostbite the fish. When it is released too late, the fish has a strong vigor, which can easily knock the fish, reduce the survival rate, and stocking too late will shorten the growth period and affect the growth of the fish. In addition, stocking should be carried out on sunny, windless days. Rain, snow, and freezing weather can cause fish to be frozen and not suitable for stocking.
3, pay attention to base fertilizer
Schiff fertilizer can reproduce plankton, on the one hand for fertility fish ingestion; on the other hand, photosynthesis of phytoplankton produces oxygen, which increases the water-soluble oxygen in the pool and facilitates the growth of fish. In general, the maturity of manure and livestock manure is 200-500kg, and new ponds or thin pools are often used. However, fertilizer tanks with more sediment can be used less or not.
4, pay attention to choose high-quality fish species
Should be selected neat specifications, physical fitness, full muscle, bright color, scales, fins integrity, no injury-free fish species stocking, in order to improve the survival rate. It is necessary to increase the stocking ratio of large-scale fish species as far as possible so that the fish and the morning market can be balanced and supply and increase output and efficiency.
5, pay attention to prevent fish from being injured
Due to the relatively low water temperature and temperature during the spring season, fish injures will not recover easily and cause fish diseases. Therefore, in the fishing, transportation, stocking and other aspects should be carefully handled to prevent fish injuries.
6, pay attention to polyculture with reasonable
Polyculture can make full use of water bodies and feeds to increase fish production and increase profits. This is what most farmers know. The key to the problem is how to become polyculture. What kind of mix is ​​more reasonable and can achieve greater benefits. According to many years of experience, I believe that species with mixed species of fish should be determined based on market information to meet the needs of consumers. What are the best-selling fish in the market and the price is good? Just try to raise as many fish as possible, and then properly breed other species. . And we must pay attention to changing the traditional habit of catching winter fishing in the past as far as possible, and strive to achieve a balanced market for edible fish along with the needs of the market. This will require more specifications and more varieties of stocking, and arrest and listing in order to achieve better results. In the specific stocking, it should also be noted that when the main cultured fish and breeding species are identified, a reasonable mix will be carried out. Generally, the main fish may account for 60% to 70%, and the fish rearing will account for 30% to 40%; Grass carp can be reared with 2 to 5 tails of carp head or carp; 4 to 5 tail carp can be reared with one carp per carp; 500g grass carp can be cared for 1 carp per carp. Regardless of which type of fish is used as the main cultured fish, squid is indispensable as a fish. It has a small individual and has a strong ability to feed on feedstuffs, has little effect on the main fish, and can increase the yield of the group. Generally, it can hold 200-200 acres. 300 tails, as a filter-feeding fish, can control the pool water, prevent excessive water quality and regulate water quality. In polyculture, it should also be noted that fish with similar or equal feeding habits should be as little as possible polycultured or not, in order to prevent one species from robbing one another and affecting the feeding and growth of another.
7, pay attention to the disinfection of fingerlings
Practice has proved that fingerling disinfection is one of the important measures for disease prevention and treatment. The disinfection of fingerlings can reduce the occurrence of diseases and improve the survival rate of stocking. The commonly used disinfection methods are: 3% to 4% salt water dipping fish species for 5 to 10 minutes, or 8mg/L copper sulfate solution for 15 to 20 minutes, also can use 10mg/L bleach solution to dip fish species 15 to 20 minutes.
8, pay attention to the temperature when stocking to prevent the temperature difference is too large
In spring, the temperature is low, the water temperature is also low, and the temperature difference is often large. Before the long-distance transport of fish species into the pond, the water temperature in the pool water and the fish tank should be measured. If the temperature difference is large (more than 3°C), the fish tank should be The water is discharged in half, and then pumped into the pond water. When the water temperature in the fish box is close to the pool water temperature, it is stocked again to prevent the temperature difference from being too large and directly stocking, causing the fish to catch colds and other illnesses.
9, pay attention to test water
That is, 3 to 5 days before stocking, take a few fishes into the pond where the fish species are to be placed (or put a bucket of pond water into several fishes) to see if the fish can survive in the water, and be certain that the fish can be in the pool water. When it is alive, restocking matters can be repeated to prevent the fish from being released when the toxicity of the pool water has not disappeared, resulting in the occurrence of a dead fish accident. It should be noted that the water temperature in the spring is low, and the toxicity disappears slowly after clearing the drug. Therefore, it should wait a bit longer to release the fish.
10, pay attention to doing a good stocking record
Write down dates, species, specifications, quantities, sources, etc., and be aware of them to provide the basis for the next farming management.
11, pay attention to timely feeding
After stocking, fish should pay attention to feeding early so that fish can feed early and grow early. After 3 to 4 days of general stocking, the fish has adapted to the new environment and can start feeding. In the early stages, more feed with high protein content is fed.
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