High-yielding Cultivation Techniques of Grass-sized Grass Fingerlings in Ponds
With the improvement of intensive pond culture and cage culture technologies, the demand for grass carp fingerlings is increasing. Because grass carp species cultivated by traditional methods have many diseases, low survival rates, and irregular specifications, it is difficult to meet modern fishery production. The need for development. In order to explore the high-yield and efficient production model of ponds and solve practical problems such as small and weak specifications of grass carp fingerlings, in recent years, the Dongkan special aquaculture farm in Binhai City of Jiangsu Province has used 13,350 acres (about 20 acres) of ponds to raise grass seedlings in early summer. By intensive cultivation of pellet feeds, 460 kg of fish were harvested every 667 y in the fall (specifications of 20 to 25 tails/kg), the survival rate was 86.5%, and the profit of 667 455 was 4552 yuan. The current high-yielding cultivation techniques for pond grass carp fingerlings are described below:
First, Tangkou conditions. A total of six test ponds, each about 2225?, a water depth of 1.8 meters, the pond is less silt, into the drainage convenient, each pond with 15 kilowatts of water aerator. In mid-late and late April, clear lime ponds are used for dry preparation.
Second, fish species. In early May, ponds were stocked with grass carp fry to cultivate summer flowers. In early June, all sales were captured and transferred. 100 kilograms of quicklime are used to clear the ponds at each of the ponds. After the fish species tested in mid-June, 10,000 grass carp summer flowers were planted at 667 pounds for each pond, and 3000 fish and silver carp were selected at one time. At the end of October, clear ponds were harvested for sale.
Third, feed feeding. Use pelleted feed plus green feed for every 667 and no more than 1,000 kg. Feed 2 times a day, each feeding time is controlled at about 40 minutes. Within one month after the summer fish species was under the pond, the normal daily feed rate was 4%. From mid-July to early September, the daily feed rate was 3.5%. It is 3% after mid-September. Rainy days are reduced.
Fourth, water quality management. Change the water every 20 days, changing the water volume every time about 1/6. Maintain the transparency of the pool water 30 to 35 centimeters, and the pool water depth is more than 1.6 meters. Splash lime once, 667? The amount of 15 to 20 kg. Use aerators as appropriate.
Fifth, prevention and treatment of fish diseases. In mid-July, pesticides were sprayed once. During the breeding process, the whole pool was disinfected and splashed with strong chlorine every month, and 3 consecutive days of monthly sulfa drugs were fed. In summer, grass carp is prone to diseases such as gills and hemorrhages, and the treatment methods are combined with internal and external use. Internal use of Kexue Kang, external use of strong chlorine, dichlorohydantoin, Bacteria Weiwei and so on. The general Tangkou treatment three times, some diseases heavier Tongkou more than 5 times, each treatment can control the condition of 20 to 30 days.
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