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River crab farmers clear their ponds for better farming next year; pond-clearing drugs must not be used indiscriminately
In many small ponds the crabs are almost all sold, and pond clearing is coming up. How to clear the pond correctly and master the methods well, to set the stage for next year's farming, is crucial! Question? Across the whole Xinghua area everyone generally stocks 1000 crabs/mu, so why after maturity are only about 500 recaptured?
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Experience and Technical Key Points for Pond Farming of Bass
1. Pond clearing and water cultivation. For ponds used to farm bass, it is best if conditions allow to dry the pond, remove silt and expose it to sunlight, especially for old ponds that have been farmed for many years. Disinfect once half a month before releasing fry, applying 50 kg of quicklime per mu or using 20 PPM bleaching powder with an appropriate amount of pond water for disinfection.
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Detailed Explanation of Key Points in Yellow Catfish Rearing and Management Techniques
1. Pond Clearing and Disinfection After stocking the pond for 7-10 days, use quicklime at 150 kg-200 kg/667 sq m for dry pond disinfection to eliminate pathogenic organisms and predators. 2. Feeding and Fertilization The pond is equipped with feed and fertilizer according to the annual production plan. The feed is mainly sinking pellet compound
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Does tea seed cake need detoxification treatment after pond clearing?
Tea seed cake, also called tea seed meal, is the residue left after oil is pressed from the fruit of wild Camellia oleifera, and contains 12-18% tea saponin. Tea saponin is a hemolytic toxin that can dissolve the red blood cells of fish, so it can kill wild trash fish, loaches, river snails, freshwater mussels, frog eggs, tadpoles and a
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Key Technical Points and Daily Management Methods for Freshwater Fish Farming
The first step in freshwater fish farming is pond clearing: after draining the pond, sun-dry it for half a month, then disinfect and add water; the second step is stocking fry, selecting high-quality fry and disinfecting them before stocking; the third step is feeding, where in addition to special feed, ryegrass can also be fed; the fourth step is fish disease
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Tea seed cake can be used as a pond-clearing agent
Pond clearing and disinfection generally use quicklime or bleaching powder, but if the pond is used for shrimp farming, using tea seed cake to clear the pond has effects that other agents cannot replace, with better results. Tea seed cake, also called tea seed meal, is a purplish-brown granular residue left after oil is pressed from the fruit of plants in the Theaceae family. Tea seed cake contains saponin, also called saponin glycoside, which is a hemolytic toxin that can dissolve the red blood cells of fish, so it can kill various wild and trash fish such as loach, as well as snails, river mussels, frog eggs, tadpoles and some aquatic insects. Saponin is easily
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Detailed Explanation of Common Pond-Clearing Drugs and Their Effects
Drug-based pond clearing is the use of drugs to kill various predatory fish, wild trash fish and other harmful organisms in the pond that endanger fish, shrimp and crab fry, creating a safe environmental condition for fry rearing. This is an important measure for improving the survival rate of fish, shrimp and crab fry. The commonly used pond-clearing drugs and their effects are introduced as follows: 1. Quicklime pond clearing and its effects: The action of quicklime in pond clearing is that after quicklime meets water, a chemical reaction occurs, producing calcium hydroxide and releasing a large amount of heat. Calcium hydroxide is a strong base, and its hydroxide ions can raise the pH value of the pond water to above 11 in a short time, thereby killing wild trash fish and other harmful organisms.
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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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Detailed Explanation of Common Pond-Clearing Drug Types and Their Methods of Use
Drug-based pond clearing is the use of drugs to kill pathogens, parasites, and various predatory fish, wild trash fish, and other harmful organisms in the pond that endanger fish, shrimp, and crab fry, thereby preventing disease from affecting the normal growth and development of the cultured species and improving aquaculture efficiency. At present, there are many varieties of pond-clearing drugs, but different varieties have different effects. Commonly used pond-clearing drugs include quicklime, bleaching powder, tea seed cake, ammonia water, croton, Tangkening, and others. 1. Quicklime pond clearing Quicklime is calcium oxide. Its pond-clearing effect is that after quicklime meets water, a chemical reaction occurs, producing calcium hydroxide,
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Pond Clearing and Medication Disinfection Methods for Aquaculture Ponds
After the dealkalization treatment of cement ponds, carry out pond clearing and disinfection promptly. Soak with quicklime at 100--150g/m³ or bleaching powder at 10g/m³ for one week, then drain the pond water and replace it with clean water. In routine management, every 10--15d, splash the entire pond with quicklime at 10g/m³, or bleaching powder at 1g/m³, or trichloroisocyanuric acid (strong chlorine essence) at 0.2-0.5g/m³, using the three in rotation. If the water is alkaline
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