The production of cement ponds alone raises the cost of Japanese Koi, and I have used the existing pond conditions to set up Koi Koi in order to replace the original Koi species. The test is now described as follows:
First, materials and methods
1. Pond conditions
The pond is a common conventional cultured earthen pond. It is rectangular in shape and extends from east to west. It has an area of ​​10 mu and a total of 10, accounting for 100 mu of water. The normal water depth is 2 meters, the water source is sufficient, the water quality is good without pollution, the pond soil is clay, and the bottom is flat and less silt. Each pool is equipped with a 3-kilowatt aerator.
2. Pond preparation
According to the conventional method of fish culture, 125 kg per acre clearing pond is used to disinfect the fish before the stock is stocked to improve the bottom 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 species stocking
The five ponds were grouped and the experiment was repeated once. The two groups had a total of 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). Other conventional cultured species are stocked at a density of 600 kg/mu. Japanese Koi is aired from Guangdong on March 15 with a fry bag to Nanjing. The fish should be soaked for 10-15 minutes before stocking. When the water temperature in the bag is basically the same as the water temperature in the pond, the fish is then removed and the fish is removed to reduce fish species. The stress response improves the survival rate.
4. Feeding management
(1) Feed Feeding: Because Japanese koi is a variant of carp, its diet is more complex and does not require special ornamental fish feed. We chose 28% of the conventional fish pellets as 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. - The amount of feed is adjusted depending on the quality of the water, the feeding conditions of the fish, and the weather. Feeding control stops the feeding of most fish when they leave the food market to reduce the feed rate.
(2) Water quality management: In the breeding process, check the patrol pool every day to understand the changes in the fish's physiological condition and water quality, and control the transparency of the pool water to more than 20 cm. With the increase of water temperature, the increase of food consumption of fish, the excreta produced can easily deteriorate the water quality, and the new water is added once a day for 10 days to keep the water tender and tender. During the hot season, oxygen aerators are often turned on to ensure sufficient oxygen in the water. There is no pan-pool phenomenon throughout the year
(3) Prevention of fish diseases: During the period of strictness, 15 kilograms of quicklime for each mu of water shall be splashed once every 1 month to regulate water quality and prevent fish diseases. In early May and early August, the prevention of fish parasites was carried out with an amount of 20 ml of water per acre of “avermectin for fishâ€. On the 10th of July, there was a hemorrhagic disease in pool No. 6, which was sterilized with 250 grams of chlorine 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
The difference between the yields of the fish ponds was not significant, ranging from 704 to 745 kg. The average yield per mu was 45.5 kg in the local carp (control pond). The Japanese carp was between 25 and 60 kg per mu due to the difference in nesting density. Koi cultivation specifications are generally between 0.5-0.7 kg, and the survival rate is over 90%.
2. benefit
The average selling price of Japanese Koi is 30 yuan/kg, and that of Koi is 1,406 yuan (based on the average production of Koi in each of the ponds). The average selling price of local Koi is 5 yuan/kg, and the production value per mu is 225 yuan. Compared with the two, the cost of investment is basically the same, but the output efficiency is obviously different. The raising of Japanese Koi is more effective than raising the net profit of local carp over 1181 yuan.
Third, the results and discussion
1. It is practical to set up Japanese Koi in earthen ponds. It is advisable to set 50-80 tails in the density of Koi. Mu cultivated amount can not be arbitrarily increased, otherwise it will affect the yield of other fish, and monthly - affect the specification of out of the pool.
2. Pre-sale carp should be raised in a special pond and screened to improve quality and increase selling price.
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