First, do a good job in pond clearing
When selling dried fish ponds can use the winter and spring fish season, when clear ponds try to clear the thick silt layer, reinforce the pool, and freeze the bottom mud. Lime and other drugs clear pond disinfection.
Second, do a good job of disinfection and fertilization ponds
In the ten days before the stocking, half a month, the pond uses 120-200 kg of lime slurry per acre. The whole pool is splashed evenly. The raw lime slurry produces a lot of heat to make the water alkaline and kill the wild fish and harmful pathogenic bacteria. Etc. and provide calcium for aquaculture waters.
About 5-7 days before the seedlings are applied, the thin water tank can apply 200-600 pounds of organic fertilizer per acre to facilitate the improvement of the water body fat, which will facilitate the growth of the seedlings with open bait rotifers and small protozoa. food.
Third, choose a good seedling, early stocking, early eating
The stocked fingerlings should be free from injury, neatness, well-developed, normal body color, robust physique, active swimming, strong anti-hydraulic, and intact body scaly, fins, disease-free, parasite-free quality seed. Try to keep the seedlings at temperatures above 10 degrees and when the weather is fine to avoid frostbite.
Fish fry ponds can be soaked with 1%-4% saline for 5-10 minutes. Let the fry or fry bags soak in the water at the edge of the pond. Allow some time for the water temperature inside the bag to be similar to that of the pond and allow the fry to swim by themselves. Or gently release. Early as early as possible after eating early growth.
Fourth, do a good job in water quality management and fish disease prevention in the spring
The spring pond water level can be lighter (about 1 meter), using the "shallow water heating" principle to help the water body temperature, keep the pool water fat, live, tender, cool, according to different circumstances as appropriate use of biological water-adjusting agent, pay attention to spring susceptible to disease And parasite hazards and prevention.
V. Three diseases and prevention and control methods in aquaculture in spring
1. The blackening of pond water and its prevention and control methods
In spring, the low temperature, rain, and hot and cold weather will cause a large number of algae deaths in fish ponds. The water quality will turn black when the water quality becomes worse. In serious cases, the pond water will stink, even causing the pond water to lack oxygen and the pond fish to float. In the event of continuous low temperature and rain, which leads to deterioration of water quality, attention must be paid to conditional additions, water changes, splashing water transfer agents, and aerators to improve water quality.
In addition, quicklime can also be used (20 kg - 30 kg per mu) to play a role in sterilization, condensation of suspended matter, and neutralization of acidic water, thereby reducing the harm to fish.
2, clear and transparent pond water and its prevention and control methods
At the end of spring, there will be continuous rainy weather, and some ponds will change from plain brown or black to clear and transparent. The main reasons are: First, there are too many zooplankton in the water, and the phytoplankton is consumed. Second, the amount of squid that may be stocked is too small.
Because the squid uses zooplankton as food material and the zooplankton uses phytoplankton as food material, the pond water becomes clear when the zooplankton is multiplying and the phytoplankton is eaten, which is unfavorable to the growth and development of the pond fish. At this time, fresh water should be injected as much as possible to increase the dissolved oxygen in the water and bring aquatic microorganisms as a provenance. You can also use crystalline trichlorfon or pesticide water to spill and kill zooplankton. Or can increase the stocking density of squid appropriately, apply topdressing organic manure to promote phytoplankton breeding.
3, fish pond pests and their prevention and control methods
The temperature in spring is low, and the rain often lasts in spring. In addition, after the winter, the resistance of fish is poor. The fish are most susceptible to diseases such as hydromycosis, vertical scale disease, and erythroderma, as well as small melon insects, trichoderma, and anchor heads. Earthworms, third-generation parasites and other parasitic diseases.
In the prevention and treatment of the above-listed bacterial diseases, chlorine dioxide, bleaching powder, strong chlorine and other sterilization drugs are used to disinfect the water body. The above parasitic diseases use trichlorfon, copper sulfate, iron and other insecticides to kill parasites. In the case of prevention, one can use the above-mentioned insecticide once, and then apply a sterilization drug once, which can fully prevent the disease.
The temperature in spring is still low. When the water temperature is between 5-12°C, most of the fish have less neurohormonal secretion and low digestive enzyme activity. Fish do not like activity and feeding, and there is a corresponding shortage of natural food organisms in the water. The rapid rise and fall of heat and water temperature will not only have a greater impact on the growth and development of fish, but also cause fish diseases or death. Therefore, it is mainly the prevention and control of fish diseases in the spring, and other management work is required in order to promote the healthy growth of fish and increase production and stability.
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