During the fish breeding stage, especially in the early stage of feeding grain feeds from the summer flower (Wu Chai) pond to the acclimation cluster, the fry has small individuals and little palatability; the food is changed from juvenile fish to adult fish, and the recipe gradually narrows to wide The differences in size between groups due to unequal eating can lead to rapid growth, high metabolic levels, and high water quality requirements, such as environmental discomfort and susceptibility to fish diseases. In production, comprehensive cultivation techniques are often used to improve the specification and survival rate of fingerlings. This article mainly introduces the characteristics of breeding techniques of carp species for reference.
First, choose a suitable pond, thoroughly clear the pond, and cultivate large-scale zooplankton.
The area of ​​the fish ponds is 2 to 5 mu. The water depth is 1.5-2 meters, the pond mud is 10-20 centimeters, the water source is sufficient, the drainage and irrigation are convenient, and the high-yield pond is required to be equipped with an aerator. Summer flowers (Musk owls) are stocked for 10-15 days before stocking. The average mu is 75 kg dry lime clear pond. Thicker sediment ponds can be used more. When using a commercially available product Clear Pond drugs, follow the instructions and you must put the fish after the test. Fish such as squid and other devoured fish prefer to eat large-scale zooplankton such as Cladocera in the early stage of pre-cultivation. It is important to cultivate good water quality before stocking to improve the survival rate and growth rate, and to ensure that the specifications of fish species are tidy.
After the clear pond, determine the amount of basal fertilizer according to the sediment of the pond. Normally, 200-500 kg of fermented organic manure (chicken excrement, dairy cow dung) will be applied after 2-3 days, add water to about 60-80 cm, and be sure to filter when water is injected. Prevent wild fish from entering. Cultivate the pool water into the leeches, and the pods in the morning are not red. If there is too much water in the pool, it can be adjusted by water injection or water exchange. Do not abuse drugs. After Xiahua (Wuzi) Xiatang, use organic manure or chemical fertilizers to adjust the water quality to maintain the water's fatness and ensure that the dissolved oxygen in the water is sufficient. Use fertilizer to adjust water quality according to water quality every time urea 2-3 kg. Simultaneous application of 1-3 times the superphosphate, respectively, fully dissolved, Quanchiposa, general fish pond phosphorus deficiency, excessive application of nitrogen fertilizer is easy to make water quality aging. If you can cultivate good bastard and other large zooplankton bait, so that in the natural seasoning ponds under the peak, generally can be in the summer flower (Wu Tsai) after the pond is not fed within 7-10 days. The continuation of the peak period of leech, in addition to fertilization, pay attention to regular water injection, water injection every 10 to 20 centimeters every 3-5 days.
Second, the reasonable stocking of fingerlings
Ten to fifteen days after clear ponds, large-scale zooplankton and other large-scale zooplankton (water fleas) of the Cladocera species reproduce in large numbers and reach the peak period. Grasping this critical period for the stocking of summer flowers (Wulsley) improves the survival rate and growth of the species. Speed ​​and ensuring that the specifications are very important. Under normal circumstances, after one week, there will be many species of winged insects flying into the pond. Before the summer flower (black catfish) is stocked, the net is used to remove the insects. It can not only eliminate the enemy but also stir the pond mud. And manure, conducive to fertilizer and water. Summer flower (Musk Breeding) mu stocking volume is generally 4000-5000. With 2500-3000 white pheasants and 800-1000 pods, the specific stocking amount can be determined according to the feeding conditions and technical level. At the same time, the main fish can be stocked early to avoid competition between the main fish and the fish on the bait. Summer flowers (black pupae) must be sterilized before squatting. With fish species, calyx and squid have a certain competition relationship on the bait, so the cauliflower ponds are put more and the bait's bait coefficient is increased. Catfish breeding ponds generally do not match grass carp.
Third, domestication, feeding
After a period of time in Xiahua (Wuzi) Xiatang, it was found that large-scale zooplankton and other large-scale zooplankton (water fleas) in the pond could be reduced to domestication with powdered feed. The summer flower (Wuzi) after Xiatang will undergo a long period of natural food cultivation, and it will have a sudden long-term. When the tame food concentrates and feeds, the fish feed can be fed. The protein content of the feed can be gradually reduced until it is lowered. Feed the finished product to reduce feed costs. To determine the grain size of the feed, it is necessary to successfully devise the standard for the smaller carp species and increase the grain size of the feed prematurely, which can easily result in irregular fish species specifications. Fall should be properly delayed in the fall of time, premature fish body weight loss. After the water temperature drops in October, fish species mostly feed under the surface of the water or feed on the water bottom. You can't stop feeding because you can't catch food on the water surface, and you need to continuously reduce the amount of feeding and feeding times when the water temperature stabilizes at 8-10°C. When the following, you can stop eating. This will increase the survival rate of winter fish species and ensure that the spring fish species are robust.
Fourth, water quality management, disease prevention
After Xiahua (Wuzi) is under the pond, water is added once every 5-7 days, each time adding 10-20 cm of water, and added to the highest level before mid-July. At the same time to replace some of the old water in a timely manner, to maintain the transparency of the pool water is better than 25-30 cm. After entering September, we must reduce the number of water injections, but we must maintain a high water level to prevent the water temperature from falling too fast in order to prolong the growth period. The aerator pond should be set to start the aerator in time to improve and regulate the water quality. Do not use the aerator as a fish saver. Fish species grow rapidly and have high stocking densities. They are prone to diseases during the breeding season, especially bacterial epidemics. Once they become ill, the growth is inhibited and the yield is severely affected, which in turn affects the life of the fish. The use of baits and conventional disease prevention measures to prevent the occurrence of fish diseases is a key measure for the cultivation and management of fingerlings, especially in high-yield ponds, showing their necessity and importance.
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