Several key measures that should be paid attention to in the polyculture of fish gills
Fish and alfalfa polyculture is an ecological culture technology that utilizes ponds for breeding. Because its economic benefits are several times that of conventional fish culture, it has been widely used in places where conditions are suitable throughout the country. However, there are some places where there have been ill-health, poor care, poor breeding and other undesirable phenomena. The author found through investigation and analysis that this was related to several key measures in some places that did not catch fish and fish. To this end, several key measures to be taken into account in fish and polyculture are described below. First, pay attention to the breeding pool 1. One of the keys to the rehabilitation of fish ponds and fish rearing should be to transform the ponds where fish are cultivated into cultivars. In particular, the slope of the pool should have a certain drainage area, or gentle slopes on the water, and the pool slope should be solid and firm so as to facilitate drying and feeding. Conditional cement board slope protection available. For some old stone slopes with stones and caves, or sandy soil slopes that are not able to wash away, it is impossible to cultivate the trees if they are not built as required. Because these dams are not only unfavorable for roosting, feeding, but also easy to hide enemy enemies and escape the stocking crickets, it will also cause great trouble for future fishing. 2. To do a good job of anti-escape facilities is reptiles, as long as there are conditions, they will escape from the breeding pool, so it is very important to do a good job of anti-escape facilities. Because the earthworms can dig holes, when the fortification escapes from the wall, attention should be paid to the combination of the ground and the underground. Generally, it is required to bury 30 cm at least underground, instead of setting only the ground. Some breeding grounds haven’t seen deaths at ordinary times, but few fishes were found during fishing. However, there were catches in the rice fields and ditches near Dianchi Lake, indicating that the artificially raised quails had escaped from the pool. 3. Clearing the bottom of the pool at the bottom of the pond should not only remove excess silt, but also use mud to level it, so that it is easy to catch and easy to maintain good water quality. If the silt is very thick and the pond area is large, it will be difficult to catch a large number of fish when they need to be sold. The silt is very thick and the bottom of the pool is uneven. It is also prone to anoxic pans, which directly affects the healthy culture of fish and alfalfa, and severely results in death and production loss. Second, develop a reasonable stocking density The stocking density of fish and sturgeon should be rationally determined based on the soil structure of the pond. For pure mud ponds, it is generally good to put 1 per 1.2 square meters; if it is 50% of sand and soil, 1 per square meter is appropriate; if sand and soil are combined, the composition of sand is over 50. %, it can raise 1.5 to 2 per square meter. This is because when a dragonfly crawls at the bottom of the pond, it is very easy to turn up the sediment if it is a pure earth sediment. The density is too high, and it is easy to erode the water quality and induce disease; instead, the bottom of the sand combined with the soil is not easy to turn over the sand due to easy consolidation. Even if it is turned up, precipitation will be faster, so you can put more. In addition, when adopting the normal culture of fish and raising the breeding mode of quail breeding and non-feeding, if it is pure mud bottom, it is advisable to use no more than 100 per 667 m2; For bottoms, no more than 200 per 667 square meters are appropriate. Third, pay attention to the species of stocking specifications Since polyculture of fish and alfalfa is an open-air culture, the growth rate is limited by the weather conditions. Therefore, when determining the stocking specifications, it should be determined according to the sales specifications and the breeding cycle you require. If you want to develop 750g or so of the two-year-old market, the specifications for stocking and breeding should be 200g to 250g; if you want to develop more than 500g of the listed market, you should stockpile about 300g of the specifications. In some places, fish, oysters, and polycultures are used. Because cubs need to be kept for 3 years to harvest pearls, oysters have to be raised for 3 years. In this case, about 150 grams of quail species can be stocked. . Fourth, pay attention to safe winter If multi-year breeding is adopted for fish and alfalfa polyculture, safe wintering management should be done. Some places usually have a good education, but due to lack of attention to winter management, wintering death is serious, causing great economic losses. The key measures for safe wintering are as follows: First, some of the larger-sized fishes should be properly caught in the fall to reduce the wintering densities of the ponds; the second is to exchange fresh water every 15 days to 20 days, and the water exchange volume should be 1 for the original pool water: 4 to 1:2; Third, when the transparency exceeds 35 cm, urea fertilizer should be used properly to make the water light green. 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