Two Key Techniques for High and Stable Yields of Yellow Catfish: Disease Control and Fishing Technology

In artificial farming of yellow catfish, the key technical measures for high and stable yields should focus on two things - disease control and daily harvesting of yellow catfish

Yellow catfish, also known as yellow catfish, yellow sprout head, yellow ding fish, yellow fish, yellow drum fish, river catfish, ga ya zi, river yellow catfish, Wallace's yellow catfish, mo ding, ounce fish, yellow horn, ga fish, yellow spine fish, yellow ox withered, grass withered, yellow cheek fish, ounce male fish and yellow bone fish, etc., is a small freshwater economic fish and a famous, special and excellent variety. To farm yellow catfish well, the key work lies in doing a good job of disease and pest control for yellow catfish. To improve the labor productivity and output per unit area of yellow catfish, it is necessary to stock fry into the pond in stages and batches, and at the same time, it is necessary to continuously harvest yellow catfish from the pond for market. Because yellow catfish itself does not grow large, by stocking fry into the pond in stages and batches and then harvesting fish from the pond in stages and batches for market, one mu of pond can do the work of 5 mu of pond; by catching the large and keeping the small, it can be harvested countless times a year.

1. Two kinds of pond clearing and disinfection in winter (1) Dry pond clearing: first drain the pond water, or leave water 6 cm to 9 cm deep, and use 75 kg to 100 kg of quicklime per mu, add water to emulsify, and immediately and evenly sprinkle it over the whole pond without waiting for it to cool. After pond clearing, generally after 7 days to 10 days the medicinal effect disappears, and fish can then be stocked. (2) Bleaching powder pond clearing: generally bleaching powder contains about 30% effective chlorine, and its dosage is 15 kg per mu, sprinkled over the whole pond. Generally after application, the medicinal effect completely disappears after 4 days to 5 days.

2. Fry stocking. Before the fry enter the pond, they need to be soaked and washed in 5% salt water for 10 minutes.

3. Water quality management. Persist in observing the algal phase and algal concentration of the water body. According to the water color, use inorganic fertilizers (urea, superphosphate, potassium dihydrogen phosphate, etc.) to regulate the fertility of the water body, and keep transparency at 30 cm to 35 cm. Scientifically use aerators according to the measurement of dissolved oxygen and the conditions of weather and water quality.

4. Commonly used drug control (1) Insecticides: Decis. At a concentration of 0.03 ppm per cubic water body, sprinkle over the whole pond, or sprinkle with a concentration ratio of copper sulfate: ferrous sulfate = 0.15:0.05 ppm. The above insecticides have a good insecticidal effect on Dactylogyrus, Trichodina, etc., but the two drugs can only be used alone, and cannot be mixed or used alternately, and even less can they be used in excess. (2) Antibacterial and anti-inflammatory agents: oral drugs (mixed evenly in feed and pressed into pellets). Sulfadimidine tablets, add 15 g to 20 g per 50 kg of bait and feed continuously for 3 days, feeding twice a day; or mix 10 g of furazolidone with 20 g of oxytetracycline and add it to 50 kg of bait, feed continuously for 3 days, feeding twice a day; oral penicillin capsules can also be used, added to the feed (5 g) and fed continuously for 3 days, feeding twice a day. For disinfecting the fish body: soak in a 0.25% bleaching powder solution or diluted penicillin powder for 10 minutes. The above oral medicinal feed is best prepared and fed immediately; prepare once and feed for 3 days. It mainly targets diseased fish with bacterial infection. (3) Treatment of hemorrhagic disease: use 50 kg of crude salt per mu and sprinkle over the whole pond, and at the same time use 100 g of sulfathiazole plus 10 g of vitamin C per 50 kg of bait, mix evenly into the bait, and feed for 3 days, feeding twice a day. In the process of preventing and treating yellow catfish diseases, generally speaking, refuse to apply trichlorfon to kill insects.

5. Scientific fishing. In the past, artificially farmed yellow catfish were very difficult to catch at ordinary times. Usually people waited until winter, drained the pond water, and then harvested for market, with one harvest a year. At present, for artificially farmed yellow catfish in China, the most scientific, simplest and most advanced fishing method is to use a magic yellow catfish catching machine. During operation, the magic yellow catfish catching machine emits artificial electrical signals in the water body, and uses the artificial electrical signals to control the nervous system of yellow catfish, turning yellow catfish into "robot-like" animals. Specifically, the magic yellow catfish catching machine generates electrical signal codes with a certain regularity, and through the conductor of water applies these electrical signals to the nerve nuclei with specific functions of yellow catfish, thereby enabling yellow catfish, under the control of the nerve nuclei, to perform the specific action of rushing out of the water surface. Yellow catfish can make a "ga, ga, ga" sound, while other fish do not have this special ability. The specific artificial electrical signals emitted by the body of the magic yellow catfish catching machine can only control yellow catfish that make the "ga, ga, ga" sound. Generally speaking, when using a magic yellow catfish catching machine to catch yellow catfish, one magic yellow catfish catching machine can catch several hundred kilograms or even several thousand kilograms of yellow catfish a day. But it is ineffective for catching any other fish. Using a magic yellow catfish catching machine to catch yellow catfish in a fish pond can not only ensure that fresh and live yellow catfish are selectively harvested from the yellow catfish pond in fixed quantities every day for market, but also ensure that the large are caught and the small are kept; it causes no damage whatsoever to the fish in the pond.