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Large-scale seedling rearing technique
Rhizoctonia striata seedlings can be cultivated in both pond and pond polyculture. These two methods are stocking about 3cm of summer flower seedlings, this stage of their habits close to adult fish, the main intake of humus, organic debris and some benthic organisms (such as benthic diatoms, Chironomid larvae, etc.). In ponds, soy milk, bean cake, and compound feeds are also eaten. If you feed a full-priced compound feed, it must be carefully domesticated. I. Single-cultivation 1. Pond conditions The pond area of ​​5-10 acres is ideal, the environment is quiet, the water depth is 2-2.5m, there is no water leakage, the bottom of the pool is flat, the ventilation is sunny, the depth of silt is 20-25cm, and the water is abundant. Row, with 1-2 sets of 1.5--3KW impeller aerator. 1. Prepare summer flowers for stocking (1) Plan well, calculate well, and arrange the time well. Summer flowers ordered to the regular seedlings. In fine weather, choose a neat, healthy and healthy piece and put it on. Note: Xiahua is not tolerant to hypoxia and floats when the dissolved oxygen in water reaches 1 mg/L; if it falls to 0.5 mg/L, it begins to die. In addition, the scales are paralyzed and irritable, and must be pulled several times to make a net. (2) Do a good job in clearing ponds and disinfecting fish ponds. When flooding, prevent wild fish and predators from entering the pond. (3) Apply 1 basal fertilizer about 1 week before transplanting, 300 to 500 kg/mu of cooked manure, and put dozens of tail watering seedlings in front of the summer flower pond. If the activity is normal, the seedlings should be seedlings at this time. — The peak period of waterlogging. 2, stocking density 3cm per mu of summer flowers to 8000--10000 tail. After about 90 days cultivation. Generally can reach 10cm or more specifications. The survival rate is about 90%, and the fry should continue to cultivate the water after applying the fish (apply fertilizer). On the other hand, it is necessary to feed soya bean cake, wheat bran or compound feed. 4, feeding must take the "four set" method. This technology uses wheat bran combined with a small portion of full-priced compound feed. That is, the daily feed material contains 60% wheat bran and 40% compound feed. The daily feeding amount should be properly adjusted according to the weather, temperature, and the fish's feeding situation. In practice, it is found that the size of the scales is not obvious. The amount of feeding should be within 1.5 hours after feeding. 5. Routine feeding and management seedlings During the intensive cultivation, the activities of pond fish and the changes in water quality should be observed frequently. The problems should be promptly taken to prevent any accidents. During the rearing period, the pool water should always maintain the fertilizer and water, the dissolved oxygen should be kept above 4mg/L, the water color should be yellow-brown or dark brown, and the transparency should be 20-30cm. Due to the high water temperature in the summer, various kinds of biological oxygen consumption in the water will increase. Seedlings often cause flooding because of poor water quality and lack of oxygen. Therefore, water quality regulation is very important. One is to fill the pond with appropriate amount of fresh water every ten to fifteen days depending on the water quality of the fishpond. When the water is injected, the wild fish (carnivorous fish) should be filtered with a mesh sheet at the water inlet, and the fish should be heavily floated before dawn. In case of emergency, new water should be filled. The second is the application of urea to the pond when topdressing is applied. It can make the plankton grow up. It can both fertilize water, and the phytoplankton can also absorb the ammonia that is metabolized by the squama species, thereby increasing dissolved oxygen. . Then, oxygen is turned on by turning on the aerator, which is usually turned on at noon on sunny days. At cloudy days, it is turned on at night and turned on before the fish floats. Second, polytrophic pleated ramets and other fish with polyculture, is after the other major fish species, according to the specific situation (the pond's fat, thin) and then add 500--1000 summer flower seedlings per mu water surface The species can make full use of the pond's water layer, and it can also develop large-sized fish species that are larger than single-species specifications without increasing the amount of feeding and without affecting the size of the main fish species. In particular, polyculture with grass carp and channel catfish ponds is more effective. Generally, the pond size is 13-15cm or more. For example, the full-price compound feed is used to feed the channel catfish species in the pool, and the polytrophic scales are slanted. The mullet species can use their surplus feed to fully utilize the remaining feed, and they can also clean the water quality to achieve a synergistic effect. This can raise the polyculture method of large-sized fish species without increasing the bait and proceed from the rational use of water bodies. It is worth advocating.