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Detailed Explanation of Key Points for Fish Fry Stocking: Do Not Overlook These Critical Points
For newly built ponds, soak in water for 1~2 days, then disinfect. Old ponds must be drained, thoroughly cleared of sludge and weeds, and treated by tilling, sun exposure, and rinsing to promote the oxidation, decomposition, and removal of organic matter, followed by disinfection. Commonly used disinfectants include quicklime, bleaching powder, and sodium dichloroisocyanurate. The disinfection method generally involves first filling the culture pond with 10~30 cm of water, dissolving the disinfectant in water, and splashing it into the pond. Cement ponds should be rinsed multiple times with the medicated solution, then rinsed with clean water. For example, one enterprise culturing whiteleg shrimp (Litopenaeus vannamei) performs disinfection 15
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Precautions for Spring Transport and Stocking of Fish Fry
Spring returns to the earth, water temperatures gradually rise, and it is once again the best time of year for transporting aquatic fry and fingerlings. During this period, because water temperatures are relatively low, fish are less active, and at the same time their bodies are firm and scales tight, so they are less likely to be injured during transport, which can increase the survival rate of spring stocking of fingerlings. There are many precautions in the spring transport and spring stocking of fingerlings, and fishermen friends are reminded to pay attention to them. 1. Pond disinfection should be carried out after removing excess sludge from the pond, reinforcing the pond embankment, and clearing the inlet and drainage ditches. Generally, for a dry pond, use about 200kg of quicklime per mu, slake it into a slurry, and
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Detailed Explanation of Key Technical Points for Stocking Icefish in Reservoirs
For the selection of stocking sites, choose as far as possible reservoir bays that are at a certain distance from the shore, with a water depth of about 2 m, a hard mud-sand or gravel substrate, and relatively abundant small prey organisms such as insects, and select several stocking sites at the same time for multi-point stocking, so as to avoid failure caused by improper stocking at a single point. Method for stocking fish eggs: when the fertilized eggs arrive at the destination, first place the nylon bag containing the fertilized eggs into the water, and when the water temperature inside the bag and the reservoir water temperature are basically the same (temperature difference less than 3°C), slowly and evenly scatter the fertilized eggs into the water; each release point should have a certain range
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Fish stocking should be arranged reasonably according to water body conditions.
During a "science and technology to the countryside" activity, the author learned that many fish farmers have had unsatisfactory yields and profits over the years in pond fish farming. The main reasons are that the fish stocked were not reasonably matched according to the feeding habits and behaviors of the fish, the varieties stocked were single, the quantities were too high or too low, and the sizes were small. This situation exists to some extent all over the country. The end of the year and the beginning of the year is the season when large quantities of fish are stocked in various places. In order to make full use of the water body, stock fish reasonably, and increase the yield per unit area of the water body, the key points for reasonably stocking fish according to local water conditions are as follows.
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Five Steps for Stocking Brood Shrimp in Rice-Shrimp Rotation Explained
Now is the golden time for stocking brood shrimp. Farmers should pay attention to the following points when stocking brood shrimp: 1. Carry out basic rice field renovation, mainly by digging perimeter ditches, reinforcing embankments, building water inlet and drainage systems, and setting up anti-escape facilities. 2. Disinfect the perimeter ditches well, preferably by spreading quicklime throughout, with a dosage of 100 jin per mu, and stock brood shrimp one week later. 3. Select good brood shrimp and stock them reasonably. Choose sexually mature, healthy individuals with complete appendages, and stock them at a female-to-male ratio of 3:1. Stock 15-20 kg of brood shrimp per mu. In rice fields that have been used for farming before
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Prevent Fish from Catching Cold When Stocking Fish in Autumn
Autumn is the golden season for stocking large numbers of silver carp, grass carp, black carp, bighead carp and other fish species into reservoirs. But many fish farmers have found that, often within 2 to 7 days after stocking, sick and dead fish are seen swimming on the reservoir surface. These sick fish lose their skin luster, their body surface mucus increases, and in severe cases they become paralyzed, rigid and die. The above symptoms are typical of a "cold," mainly caused by drastic changes in water temperature, in which the nerve endings in the fish skin are strongly stimulated and the internal organs' activities become disordered, with a mortality rate as high as 20% to 60%. Fish species are transported from the fish pond to
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What are the pond-clearing methods? Remember these five before stocking fish fry
Before stocking fish fry, the aquaculture pond must be cleared to kill various predatory small wild trash fish, harmful aquatic animals and plants, parasite eggs, pathogenic bacteria, etc., creating a good environment for the growth of adult fish. The following five pond-clearing methods are introduced: 1. Clearing the pond with quicklime. When carrying out drainage pond clearing (that is, draining the pond water to a depth of 5-10 cm of remaining water before clearing), use 60-70 kg of quicklime per mu of pond; when clearing without draining, use 125-150 kg per mu of pond for every meter of water depth (200 ppm).
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Stocking fish fingerlings in early spring requires care; mastering the method is key
Fingerling quality For fingerlings of the same species and age, the specifications should be uniform, with little difference in body length and body weight, thick back muscle, bright color, intact scales and fin rays, normal activity, and strong upstream-swimming ability. After being taken out of the water and placed in a basin, the gill cover should not open, the tail should not bend, and the fish should keep jumping, with no wounds or parasites on the body surface. Fingerling disinfection Some farmers do not disinfect fingerlings at all when stocking them, resulting in a high disease rate, and drug treatment is not ideal. In fact, as long as fingerling disinfection is done well, it often achieves twice the result with half the effort in preventing fish diseases. Fingerlings
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Technical key points and precautions for stocking fish fingerlings in winter
1. "Five conversions" of fish ponds. Convert "small ponds" to "large ponds", "stagnant ponds" to "live-water ponds", "shallow ponds" to "deep ponds", "leaking ponds" to "water-retaining ponds", and "emergency ponds" to "flood-control ponds". When renovating ponds, first drain the pond water, and after sun-drying, remove excess sludge from the pond bottom, keeping only a 15-20 cm layer. Remove weeds, dredge channels, and raise the pond embankments. 2. Pond clearing and disinfection. Keep the pond at a water depth of 10 cm. First, for every 667 sq m of water surface, use 90 kg of quicklime or 4 kg of bleaching powder containing 30% chlorine,
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How to cultivate fingerlings after autumn stocking to ensure the survival rate
Doing a good job of autumn intensive cultivation of fingerlings is the key to improving the overwintering survival rate of fingerlings. To improve the environment, before stocking the fingerlings, release half of the original pond water and then add fresh water. Apply 150 kg of fermented manure per mu of pond, once every 9 days, for a total of 3-5 applications. Appropriately apply additional chemical fertilizer mainly consisting of nitrogen and phosphorus; generally apply 1.5-2.5 kg of urea and 3-5 kg of superphosphate per mu of pond, once about every 7 days. After each fertilization, add fresh water so that the pond water transparency remains at 20-30 cm. Every half month, use 10
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