Japanese koi is a kind of valuable large-scale ornamental fish that is artificially selected, crossbreed, and cultivated by squid, and its body is gorgeous and beautiful, and it is beautiful and graceful. It is loved by people, and the market is optimistic and the breeding tends to be hot. The production of cement pools in Japan raises the cost of Japanese Koi alone. With the existing pond conditions, the Kochi nests with Japanese Koi to replace the original carp varieties, and their benefits have been significantly improved. In 2004, the fishing technology station in Lishui County, Jiangsu Province selected 10 ponds to measure 100 mu of water and conducted routine trials of Japanese fish koi in order to obtain good results. First, materials and methods: 1. Pond conditions: The pond is a common conventional breeding earth pond, was rectangular, east-west direction, an area of ​​10 acres, a total of 10, accounting for 100 acres of water. The normal water depth is 2 meters, the water source is sufficient, the water quality is good and no pollution, the pond soil is clay, the bottom of the pool is flat, and there is less silt. Each fishing pond is equipped with a 3-kilowatt aerator. 2. Pond preparation: According to the conventional method of fish culture, before the stocks are stocked, they are disinfected with clear lime of 125 kg per mu to improve the sediment quality. Ten days before stocking, the fish should be injected into clear water up to 1 meter deep, and 150 kg of organic fertilizer should be used to cultivate plankton. 3. Fish stocking: Set 5 ponds as a group and repeat the test once. The two groups total 10 ponds. In the two groups of trials, No. 1 and No. 6 ponds were reared with 50 tails per acre for the control ponds, while other ponds were reared with 30 Koi (Mussels No. 2 and No. 7) and 50 (3) per Mu. No. 8 and Tongkou of No. 8), 80 (Tangkou No. 4 and No. 9) and 100 (No. 5 and No. 10 Tongkou). The stocking of other conventional cultured species was stocked at 1,200 pounds per mu. See specific fish stocking schedules. Japanese koi fish fry before stocking first soaked in the pool for 10 minutes to 15 minutes, when the water temperature in the bag is basically the same with the water temperature in the pond, then remove the bag and put the fish, in order to reduce the stress response of the fish species and improve the survival rate. 4. Stocking density: 5. Feeding management: (1) Feed feeding: Because Japanese koi is a variant of carp, its feeding habit is more complex and does not require special ornamental fish feed. We chose 28% of the conventional fish pellets as the protein and feed them with a bait feeder. The amount of feed was controlled at 2% to 5% of the fish's body weight. Feed 3 times a day, each boot for 1 hour. And depending on the water quality, fish eating conditions and weather conditions to adjust the amount of feeding, feeding control to stop feeding most fish to leave the food market, in order to reduce the bait coefficient. (2) Water quality management: In the breeding process, the inspection pool is inspected every day to understand the changes in fish condition and water quality, and the transparency of the pool water is controlled to be more than 20cm. With the increase of the water temperature, the fish food consumption increases, and the resulting feces The water quality is easily deteriorated, fresh water is added once a day, the water quality is kept cool, and the aerator is often turned on during the hot season to ensure that the water body is rich in dissolved oxygen and there is no flooding phenomenon throughout the year. (3) Prevention and treatment of fish diseases: Normally, 15 kg of lime and 1 g of milk are sprayed on the surface of each mu for every half a month to control fish diseases. In early May and early August, the prevention of fish parasites was carried out with the use of 20 milliliters of water per acre for the surface of "A. velutinae." On the 10th of July, there was a hemorrhagic disease in the pool No. 6. The bromine chloride was disinfected and treated with 250 grams per acre for two consecutive times. No large number of sick fish have been found dead all year round. Second, the test results: 1. Yield, survival rate: a total of 10 test fishing ponds, totaling 100 acres, the harvest. The difference in fishery pond production is not significant, ranging from 704 kg to 745 kg, of which the average yield per mu is 45.5 kg in the local carp (control pond). The Japanese carp is 25 kg to 60 kg per mu due to the difference in stocking densities. between. Koi cultivation specifications are generally between 0.5 kg and 0.7 kg, and the survival rate is above 90%. 2. Benefits: The average selling price of Japanese koi is 30 yuan/kg, and that of koi is 1406 yuan (based on the average production of koi fishes in each pond). The average selling price of local eel is 5 yuan/kg, mu. The output value is 225 yuan. Compared with the two, the cost input is basically the same, but the output efficiency is obviously different. The raising of the Japanese Koi is better than raising the net profit of the local carp over 1181 yuan. 3. Results and discussion: 1. In the earth pond, Japanese carp was used as a substitute for the local carp species. Without increasing the feeding cost and other breeding costs, the market value of Japanese carp was higher and the benefits were significantly improved. 2. The use of existing ponds for breeding Japanese Koi, because its breeding technology is not complicated, it is easier to promote large-scale farming. 3. It is practical for the Japanese ponds to be nested in earthen ponds. It is advisable to set the density of Japanese oysters from 50 to 80. Mu-cultivation can not be arbitrarily increased, otherwise it will affect the output of other fish, and affect the specifications out of the pool. 4. Before the sale, the carp should be raised in a special pool and screened, which will increase the quality and increase the selling price.
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