Methods of raising carp 1. Pond conditions
It is required that the water source and power supply are sufficient, the transportation is convenient and pollution-free, the pond culture area is 6 mu, the water depth is kept at 1.8 m, the mud at the bottom of the pond15 ~ 20 cm, and the seedling culture pond is 4.5 mu.
2. fry stocking
(1) One-crop adult fish culture: At the beginning of April, the commercial carp stored in the pond last year was completely caught, and the pond water was drained to remove wild miscellaneous fish and harmful organisms. Then, the pond was filled with water, and 30 g/m3 bleaching powder containing 30% chlorine was sprinkled and disinfected in the whole pond 7 days before seedling release. A carp culture was carried out in mid-April, and it reached the standard of adult fish sales in early August.
(2) Large-scale fry cultivation of the second-crop carp: all the existing commercial carp in the last-crop pond were sold in early August, and the water in the pond was drained and injected into the new water depth 1 m, and the whole pond was sprayed with bleaching powder containing 30% chlorine five days before the fry was released. Stock carp fry 1800 fish/mu, with specifications of 50g/fish; stock silver carp fry/mu, with specifications of 750g/fish, and silver carp fry/mu, with specifications of1250g/fish at the beginning of October. Culturing to catch in early April of the following year.
(3) fry culture in fry pond: fry culture pond is a complete set of adult fish culture pond. In the first half of April, the fry stored in the pond last year were caught clean, drained and dried for more than one month. In mid-May, inject 30 cm of water, and sprinkle with quicklime 150 kg/mu for disinfection. 200 kg/mu of fermented chicken manure was applied before seedling release/0/0 day in 10, and the biological bait was cultivated with rich water. In early June, 7000 carp summer flowers, 300 silver carp and 200 silver carp were released. In August, when the carp grows to the size of 50g/tail, a part of carp will be caught as the second-crop carp in the adult fish pond. The second-crop carp fry cultivation time is in the high temperature season, so it is not allowed to be caught by pulling the net. In order to reduce the damage of seedlings and bacterial infection, the seedlings were put into the pond for cultivation by copying the net and fishing for seedlings. The remaining carp fry will be cultivated until the middle of April of the following year, which will be used as large-scale fish species cultured in a fish pond. Flowers and silver carp fingerlings in the adult fish culture pond also come from the fry culture pond.
3. Daily management
(1) Feed feeding: Carp granules are used as compound feed, and the nutrients are crude protein? 30%, crude fat? 1 1%, crude fiber? 8%, crude ash? 14%, calcium 0.8% ~1.5%, moisture? 14%; What is the crude protein of carp fry granules mixed with feed? 33%。 The feed particle size is adjusted in time with the growth of carp, subject to palatability. The next day, the seedlings were domesticated by artificial fixed-point, fixed-time and acoustic conditioned reflex, and then transferred to normal feeding when the seedlings swarmed for food. The method of fixed-point, fixed-time and quantitative feeding is adopted. In the process of carp culture, the daily feeding amount is 3% ~ 4% and 3 times a day in the early stage, and the daily feeding amount is 2% ~ 3% and 4 times a day in the later stage. In the process of carp fry cultivation, the daily feeding amount is 7% ~ 8% and 5 times a day in the early stage, 4% and 4 times a day in the middle stage, and 3% and 3 times a day in the later stage. According to the water temperature, weather changes and seedling growth, it can be flexibly mastered and adjusted at any time.
(2) Water quality control: the pool water is kept fresh, the transparency is 20 ~ 30cm, the pH value is 7.5 ~ 8.5, and the dissolved oxygen is above 4mg/L.. Change the water once every half month, with the amount of water changed being 30%, and disinfect it once every10 ~15 days according to water quality indicators such as pH value. After the efficacy disappears, sprinkle photosynthetic bacteria and Bacillus to purify the water and keep the ecological balance of the pool water. Start the machine in time to increase oxygen. Start the machine in clear weather: 12:00- 14:00, 20:00- 6:00 the next day. Start the machine all day in rainy weather, and increase oxygen immediately when there is no oxygen.
(3) Disease control: Disinfectants and biological agents are combined to control diseases every half month. When carp are found to have poor food intake and wandering, they should be fed less at first, and at the same time, dibromohydantoin 0.3g/m3 is sprinkled in the whole pond. After the drug effect disappears, the feed is mixed with photosynthetic bacteria and immune polysaccharides to make biological bait for feeding, once a day for three consecutive days.
Introduction of carp scales have cross texture, so they are famous carp. Scales do not turn white after death. There are 36 scales from beginning to end, regardless of the size of the fish, and there are small black spots on each scale. It tastes excellent and is produced everywhere. One of the delicacies on the table of China people. In addition, koi fish with colorful patterns has high ornamental value in Asia. Carp, commonly known as carp abductor, hair seed, etc., belongs to CYPRINIDAE. The body is flat and the abdomen is round, and the mouth is horseshoe-shaped, and it must be 2 pairs. The base of dorsal fin is long, and both dorsal fin and gluteal fin have a thick hard spine with sawtooth. The side is golden yellow, and the lower leaf of caudal fin is orange red. Carp usually inhabit the bottom of water bodies with aquatic plants in rivers, lakes, reservoirs and ponds, and mainly feed on benthos. It has strong adaptability, cold resistance, alkali resistance and hypoxia resistance. They can lay eggs in running water or still water, and the spawning places are mostly in water grass, and the eggs adhere to the water grass to develop. Carp is one of the freshwater fishes with the largest variety, the widest distribution, the longest breeding history and the highest yield.