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The applied organic fertilizer can be selected according to local conditions. General manure 250-300 kg per acre, or green manure (green grass) 300-400 kg. In order to speed up fertilizer and water, organic fine fertilizer and silkworm sand can be applied. After one week, the survival rate of fry was significantly higher than the survival rate of fertilizer.
Due to the fat underwater pond, it is easy to enter the misunderstanding. It is believed that plankton is rich in fertilizer and water, but this is not the case. Plankton breeding also requires adequate dissolved oxygen and light. The new water has better oxygen and transparency than fertilizer and water. Sometimes, some harmful organisms, such as crustaceans, grow in the fertilizer water. When the fishes are under the pond, they are vulnerable to insects and seriously affect the survival rate of the seedlings.
One week after the fish seedlings in the pond, the reproduction time and peak number of various plankton in the pond are different. The general order is: first, phytoplankton and protozoa, followed by rotifers and invertebrate larvae, and then small branches. , Large branches and copepods. When the surface of the fry grows to 15-20 mm in length after entering the pond, the rules of feeding habits are: rotifers and nauplii, a small cladocera, a large cladocera and copepods. As long as the ponds are cleared at a proper time, fresh water, fertilizer and water are injected at appropriate times, and fish fry can be placed at appropriate times, the consistency of the two can be used to increase the survival rate of the fry, and the fry is rich in palatable natural foods at each stage of development. Therefore, timely fishponds are important technical measures for raising fish fry. In a timely manner, under the pond, when the number of water rotifers in Dianchi Lake increases gradually (that is, 5 000 to 10 000 per liter of water and the biomass is more than 20 mg), the fry is put into the pond. The time of the fry pond is too early and too late will seriously affect the survival rate and growth rate. Therefore, it is necessary to grasp the occurrence time and development pattern of rotifers in pond water.
According to the determination of the aquatic product improvement field in Liyang City, Jiangsu Province, when the water temperature is 20-25°C, the number of rotifers will increase gradually after 3-5 days of fertilization in Yuchi Clear Pond, and the number of rotifers can reach the peak in 7-8 days, continuing 5-6. The number of days began to fall. Special attention should be paid to not putting fertilizer into the pond after 7 days of fertigation. Since rotifers have not developed to the peak after 7-8 days of fertigation in the clear pond, some small hornlike species appear sporadically, and then the number increases and turns with the round. Insects compete for food. In this way, the feeding ability of Cladocera is stronger than that of rotifers, thus inhibiting the development of rotifers. This will seriously affect the food that has just entered the pool of young seedlings, causing serious consequences for the low survival rate of fry. After 2 days of fertilization, the fry was fed into the pond and then fed with paste-like or egg-yolk pulp and soy milk. Both the seedlings and the rotifers were fed. The results were very good. This will not only extend the peak period of the rotifers, but also the fish will grow significantly faster.
2. Determine the stocking density according to the ratio of the quality to the quantity and the stocking ratio. The so-called quality ratio and quantity ratio stocking technique is to make full use of water resources. According to the principle of each niche, using the ecological balance technology, when the seedlings are placed, the stocking density is determined according to the mass ratio and the quantitative ratio. The stocking density is determined by the relationship between the number and the amount of fish. At the same time, based on the source of fry, water, feed and fertilizer, and fry pond conditions, feeding technology levels and other flexibility. At present, suitable stocking densities range from 100,000 to 150,000 seedlings per mu.
If it is necessary to stock up to 18-20 mm (Yuzzitou), when the net is divided into ponds and sold, the stocking density can be appropriately increased, with 200,000 - 250000 tails per mu, and grass and fish fry 150,000. -200,000/acre. If the ponds are to be exported every day afterwards, the stocking density can be further increased. If it is necessary to grow from fry to summer fish species, it is advisable to use 100,000 to 120,000 tails per mu when not preparing for moving nets.
3. Matters needing attention when fry is stocked In order to prevent accidents after the fry in the pond, one day prior to the fry stocking, some harmful aquatic insects, frog eggs, and frogs that grow in the pond of the clear pond are to be used on the day before the fry are stocked. Mudworms and other catches are very necessary.
(1) When the fry is hatched, the fry is hatched for 4-5 days. The fry can be normally balanced (that is, people often say that they have already waisted). The pond should be unloaded immediately, the pond should be too early, and the fish's activity and feeding capacity should be weak. Sink into the bottom of the water to death; too late oocysts have long been absorbed, fry because of lack of timely food and weight loss, poor health, will reduce the survival rate. When there are such phenomena in the fish ponds in front of the pond, the fish fry should be put in a pond and placed in a cage in front of the pond. The fish should first be fed with egg yolk to form a paste and then fed to the pond to reduce the death. Rate, thereby increasing the survival rate.
(2) Mixed and single-stock ponds should be stocked with the same batch of fry, so as to avoid the decline in survival rate and the difference in specifications, which directly affects the quality and quality of fry.
(3) The water temperature must be well understood. The difference between the water temperature of the fry container and the pond water should be less than 5°C; when the temperature of the water in the container should be adjusted to exceed 5°C to bring it close to the pool water temperature, the fry can be stocked in the pond.
(4) When counting seedlings, ponds should be counted accurately so that they can properly control the amount of feed and fertilizer used. More importantly, there should be a big difference between the number of fish ponds and the number of pond plans, which will waste water and affect the annual production plan.
(5) The wind direction fry pond should not be larger than 4 mu, and when the fish fry is put in weather conditions with 4-5 level wind, the place where the fry should be put should be in the upwind position. If it is put in the downwind position, the fry can be easily blown into the wind. Killed by the pool to reduce the survival rate.
(6) Testing the drug properties should pay attention to the disappearance of the drug properties of the clear pond. You can use the container to take some water, put a small amount of fry, after 7-8 hours without exception, prove that the drug has passed, can be stocked to ensure the survival rate of stocking seedlings.
1. New Underwater Pond The so-called “New Underwater Pond†refers to a 45-55 cm deep clean water injected into the pond 2 days before the fish pond and immediately applies organic fertilizer to raise the fish in the pond. After the fish fry are put into the pool, not only the amount of dissolved oxygen in the water in the pool but also a certain amount of natural foodstuffs are maintained.