The stocking of fingerlings is an important technical link in aquaculture. It is an important issue related to the success or failure of breeding and the economic benefits and ecological benefits of farming. The following is a brief discussion on the various technical points and disinfection of fingerlings in fish stocking. First, the season of stocking Early stocking of fish species is one of the measures to fight for high yields. As the saying goes, "The fish in the spring will start to fish and the fish in winter will be three minutes long." Practice has proved that the winter solstice to the beginning of the spring is the best time for the release of fish species, is conducive to early adaptability of fish species to the environment, and facilitate the overwinter management, promote the spring and long fish species, increase production. The Yangtze River basin is generally stocked before the Spring Festival. Northeast and North China can be stocked when the water temperature stabilizes at 5-6°C after thawing. When the water temperature is lower, stocking is better than when the water temperature is higher. Winter stocking has the following advantages: 1. The water temperature is low, the fish activity is reduced, which facilitates fishing and transportation, reduces damage, and improves the survival rate; 2. When the water temperature is low, the number of various pathogenic microorganisms is small, the fertility is weak, and the probability of occurrence of various diseases is greatly reduced; 3. The ferocious fish consumes a great deal of food in winter or stops feeding. The damage to fingerlings is small. When the temperature rises after the spring begins, the ferocious fish begin to ingest food. The fingerlings have initially adapted to the water environment, and their ability to escape predators has increased. 4. The fish species can adapt to the new environment in advance, and can feed after the water temperature rises, prolonging the growth period; 5. The water level in winter is low, there is no need to drain water, and there is less chance for fish species to escape. Second, the time of restocking The stocking of fingerlings must be conducted on a sunny day, and it is appropriate at noon; cold, snow, and snow cannot be stocked in order to avoid frostbite in catch and transportation. For lakes and reservoirs with large bodies of water, it is better to choose lake ponds or reservoirs in the favorable conditions for 5-7 days, and provide special conservation during the period of temporary conservation so that fish species gradually adapt to the environment of the new water bodies during the temporary period. The conditions are conducive to improving the survival rate and growth rate of fingerlings. Third, the place of restocking In places where fingerlings are stocked, care should be taken to: 1. Keep away from inlets, outlets, spillways, pumping stations, etc. so as not to be damaged by the water stream; 2. Fish species should also not be stocked in the shallow bank of the lower outlet in order to avoid being beaten by shore waves; 3. It is not appropriate to concentrate on a single place to avoid cofferdams for ferocious fish; 4. Lakes and reservoirs with significantly lower water levels in winter should not be put in the upper reaches or in the shallow part of the Kuwan River to prevent the fish species from dying due to stranding of water. 5. It is advisable to choose scattered sites that are sheltered from the sun, rich in feed, and suitable depth. Fourth, the density of stocking In the premise of being able to develop the product size of the adult fish or the fish species with the expected size, the stocking density of the highest fish yield can be reached, that is, a reasonable stocking density. Reasonable stocking densities should be determined based on pond conditions, water quality conditions, types and specifications of fish, feed and fertilizer supply, feeding and management levels, and the practice results of the stocking (polyculture) model over the years in the pool. Within a certain range, as long as the feed is adequate, the water quality of the water source is good and the management is proper. The larger the stocking density, the higher the yield. However, the limiting factor in raising the density of fish farming is the water quality; if the fish is overstocked, the pool water will often be in a state of low dissolved oxygen, and the growth of fish will be limited; furthermore, the organic substances such as baits, feces and animal carcasses in the water will be deprived of oxygen. The production of toxic substances such as ammonia, hydrogen sulfide, and nitrite under conditions that inhibit the growth of fish and even poison the fish can hardly achieve the goal of increasing production. Fifth, the disinfection of fingerlings Disinfecting the fish body with liquid medicine is an important work before the fish species are put in place. It is an effective measure to prevent fish diseases and improve the survival rate of farmed fish. In production practice, even healthy and unblemished fingerlings will inevitably carry some pathogens, such as direct stocking without disinfection, and once the conditions are right, these pathogens will multiply and cause diseases. The drugs that can be used to prepare fish disinfectants in production include bleaching powder, ketone sulfate, potassium permanganate, salt, trichlorfon, and Weikang. Weikang is the only disinfectant that has received the EPA (United States Environmental Protection Agency) environmental protection label, and it has immunity to taura virus, shrimp white spot virus, pathogenic vibrio, Aeromonas hydrophila, mycoplasma, fungi, coccidial oocysts, etc. It is a safe, broad-spectrum and high-efficiency new disinfectant. It has a remarkable killing effect, and it is easy to decompose, no residue, and no irritation. The sterilization effect is not affected by the hardness and pH of the water body. Before the fish species are stocked, 10-30 ppm Weikang solution bath for 10-30 minutes can achieve a very good disinfection effect. Disinfection of fingerlings should pay attention to the following points: (1) One of the above drugs can be used; (2) The drug solution should be used with the use; (3) The drug dosage should be accurate, do not arbitrarily increase the drug concentration or extend the immersion time; (4) Wooden or plastic basins and barrels are to be used to prepare liquid medicines. It is not advisable to use metal containers to make liquid medicines; (5) Feeding of fingerlings should be performed at a suitable temperature (10-15°C) in sunny weather. When potassium permanganate solution is used Should not be carried out in the direct sun; (6) The entire operation must be careful not to injure the fish body; (7) When the fish is immersed in the body, it must be guarded, and observe carefully, and find that fish species have floating heads, swims, or turn over the abdomen and other abnormal phenomena Remove the pool immediately to prevent death from poisoning. (8) When the number of fish species is large, use a plastic film to form a sterilization box to dip the fish species under the pond. (9) It is better not to pour the fish liquid into the pond after dipping the fish species. in. (Motion Protection Institute Hu Huaming) The edible effect of chicken Peppery Chicken,Salt And Chilli Chicken,Pepper Chicken,Sweet Chilli Chicken GUYUAN XINYUE FOOD CO.,LTD. , https://www.xyamin.com
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Technical points for scientific breeding of fingerlings