1. Fish selection should be correct: Males grow fast, but if there are female tilapia in fish ponds, male tilapia will affect growth due to nesting and taking care of fry; it will also result in excessive reproduction of offspring, thus affecting Farming plan. Therefore, the selection of fingerlings is mainly based on males with high growth rate, fast growth and large size, high feed rate, and high catch rate.
2. The conditions of the pond are suitable: The specifications of the ponds for cultured tilapia are not strict, the area can be large or small, even small reservoirs can be cultured. Tilapia is an excellent choice for cage culture species; water depth requirements are not strict, However, for tilapia ponds that require winters, the water depth is required to be more than 1.7 meters.
3, the appropriate stocking density: fry phase of the stocking density 5000 ~ 20,000 tail / acre, adult fish stocking density of 1000 ~ 2500 / acre, usually in order to ensure greater market size, stocking density of 1000 ~ 1500 tail / acre. Tilapia is mainly used for fish fillet processing. Generally, it can be listed for more than 400 grams. The price above 600 grams has been raised. The price above 800 grams is generally higher than 400 grams by 2 yuan/kg. Large-size adult fish is sold.
4. Properly collocated with varieties: For each mu of polyculture, 50 to 100 tails of 7 to 10 centimeters of Wuling seedlings are placed 3 to 4 months after the tilapia flowers are put into ponds. The purpose is to control the offspring of tilapia breeding. The carp is stocked with 30 to 50 tails; the local pond has 300 to 800 tails; the carp has 10 to 20 tails; and the black marshes have 1 to 2 tails. In the tilapia fingerling stage, do not mix other large-sized fish species to prevent competition with tilapia. Tilapia weighing more than 100 grams formed a feeding habit, and other large-sized fish species gradually reduced their impact.
5. Pay attention to drainage and irrigation: When adding water into ponds and drainage, special attention must be paid to preventing entry into other wild tilapia, and measures for blocking the net must be completed to thoroughly clear ponds to prevent tilapia from multiplying in fishponds.
6, regular open aerator: tilapia generally will not die due to floating head, but also pay attention to open aerator, the purpose is to make the fish pond water below the bottom, prevent tilapia floating head or floating, reduce tilapia Additional nutrient consumption. When the weather is fine, turn on the machine at noon for 0.5 to 1 hour. In the early morning, turn on the aerator again.
7, water quality management requirements: Tilapia water requirements for relatively thin and fat, it can absorb water plankton as food, relatively fertilized water has an effect on the increase of dissolved oxygen in water, therefore, require water quality is relatively fat, transparency is 25 It is better between ~35cm. Relatively speaking, the water quality of the fingerling stage is better than that of the adult fish stage.
8, timely sparse, batch arrest: the full use of water to ensure the rapid growth of tilapia in fish ponds.
9, cold measures: Tilapia have cold resistance weaknesses, in order to prevent the fish was frozen to death, the sun before the end of winter should not be excessive over the pond, so that tilapia can nest nest winter habitat. In the winter, try to deepen the pond water, construct a windshield in the north corner of the pond, and raise the water hyacinth on the water surface to prevent convection on the fish ponds, postpone the cooling time at the bottom of the pond, and modify the fish ponds to deepen the pond waters. 2 to 5 meters or more.
10. Disease prevention: Tilapia has few diseases, the fry stage is mainly to prevent parasites, followed by snakes, frogs, and birds; the adult stage is mainly to prevent frostbite and feed nutrition deficiency syndrome. There are fewer opportunities for drug use and meet the conditions for processing exports.
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