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Case Analysis of Fish Disease Outbreak Prevention and Control in a Small Reservoir
In early October 2005, an outbreak of hemorrhagic disease occurred in the fish farmed in Tuonan Reservoir in our town. Through our active treatment, the disease was basically brought under control. The prevention and control situation is summarized as follows: 1. Basic information. Under normal conditions, Tuonan Reservoir has a water area of 100 mu, and 150 mu during the high-water period, with an average water depth of 3 m and a maximum depth of 6 m. Artificial aquaculture in this reservoir began in the early 1990s, mainly with conventional fish species, with supplementary stocking of freshwater shrimp, yellow catfish, and others. The reservoir water is clear and has no history of epidemic disease.
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What are the commonly used drugs for fish? A detailed introduction
At present, there are many kinds of drugs commonly used in fish farming on the market. Because fish drug production is not yet standardized, some products from various manufacturers do not indicate their active ingredients, and the trade names of some similar finished drugs are not consistent with their corresponding chemical names. This is not conducive to our understanding of the active ingredients of drugs and also creates certain difficulties for scientific and rational medication. In order to popularize fish disease prevention and treatment technology, we will successively introduce knowledge about drugs commonly used in fish farming. This is expected to improve our understanding and awareness of commonly used drugs so that drugs can be used scientifically and rationally in production.
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Ten Suggestions for Improving the Efficacy of Fishery Drugs
Fish inevitably suffer from various diseases during the aquaculture process, and when treated with drugs, the results are often unsatisfactory because the therapeutic effect of drugs is affected by various factors. Here, based on my own experience, the author puts forward "ten points" of suggestions for improving the efficacy of fishery drugs, for the reference of the majority of farmers when using drugs. 1. Accurately diagnose fish diseases and use drugs according to the symptoms. Using drugs according to the symptoms is one of the most basic conditions for improving the therapeutic effect of drugs, especially for some fish diseases that are easily confused (such as: gill rot caused by Sinergasilus parasitism
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Sea Red Fish Lips
Ingredients: soaked fish lips...750 g, refined salt...25 g, crab roe...125 g, scallion sections...10 g, red carrot...100 g, ginger pieces...5 g, wet starch...15 g, chicken and duck broth...600 g, Shaoxing wine...20 g, rendered lard...125 g, monosodium glutamate...7.5 g. Method: 1. Rinse the soaked fish lips with cold water, cut into strips 10 cm long and 1.65 cm wide, blanch in boiling water to initially remove the fishy smell. After removing, check them, pick out the softer ones
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How to choose fish medication? These are safe and effective
Dibromohydantoin is a compound disinfectant with a strong effect of killing bacteria and viruses, with a lasting efficacy. It can effectively prevent and treat bacterial or viral diseases in fish and shrimp, and is applied by splashing over the whole pond. Prevention: use once every 10-15 days, with a dosage of 0.1-0.2 grams per cubic meter of water; Treatment: a dosage of 0.2-0.3 grams per cubic meter of water, and if the condition is severe, use it once more after 2 days. Chelated copper has the characteristics of high efficiency and low toxicity. It not only retains the insect-killing and algae-inhibiting effects of copper sulfate, but is also far less toxic to fish and shrimp than copper sulfate, and its effectiveness is not easily affected by the water environment, making it a good substitute for copper sulfate.
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How to mix fish feed? A detailed explanation of 9 practical formulas
1. Suitable for grass carp or silver carp and bighead carp: 70% rice straw powder, 15% soybean cake, 10% cottonseed cake, 5% cornmeal, plus 1% bone meal, 0.5% salt, and an appropriate amount of vitamins. 2. Suitable for cage-cultured grass carp: 60% soybean stalks or peanut vines, 15% soybean cake, 10% rapeseed cake (or cottonseed cake), 10% cornmeal, 5% fish meal, plus 1% clam shell powder (or bone meal), 0.5% salt. 3. Suitable for grass carp: 45% dried green grass powder (or peanut vines, sweet potato vines), 15% soybean cake, 15% rice bran, 15% wheat bran, 1
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How are artificial triploid catfish bred?
The ordinary animals we see every day, such as pigs, chickens, dogs and fish, generally contain two sets of genetic carriers - chromosomes - which in genetics are called diploid. Normal sexual reproduction is the process of diploid replication. Fish, like other animals, go through the process of gestation - growth - reproduction of offspring during their lifetime. In pond culture, once fish grow to maturity they use the nutrients taken in from feed to develop their gonads, that is, the testes or ovaries; during this period bodily growth stops, which is unfavorable for obtaining the best farming returns. Some fish
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Rearing of Adult Snakehead Fish
The snakehead fish is a valuable freshwater fish of high economic value, known as the "treasure among fish." It is highly nutritious, containing large amounts of protein, more than that found in chicken and beef. From a nutritional standpoint, the snakehead fish is a comprehensive-nutrition, delicious-tasting premium health food. Rearing of adult snakehead fish refers to the production process of raising fingerlings to food-fish size in small water bodies such as ponds, pools and cages. Artificial cultivation of snakehead fish includes two methods: extensive polyculture and intensive monoculture. Extensive polyculture means culturing them together with the four major Chinese carps in fish ponds. Intensive monoculture
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What are the symptoms of fish poisoning?
1. Symptoms of mass poisoning in fish In winter dry seasons, fish poisoning by pyrethroid pesticides is likely to occur in aquaculture water surfaces, ponds, reservoirs, ditches and other water bodies. After poisoning, fish in groups mainly float on the water surface, drift with the waves, and lose balance. At the beginning of poisoning, they show momentary excitement, then swim slowly, respond sluggishly to surrounding stimuli, lie still and on their sides, slowly wag their tails, slowly open and close their mouths, and finally sink to the bottom and die. From the onset of poisoning to death, the toxic effect takes a short time, and the mortality rate of fish after poisoning is high. Fish show slightly different symptoms of poisoning by different pyrethroid pesticides. At present, the main varieties commonly used in agricultural production on the market include fenpropathrin (Meisaoli), fenvalerate (Sumicidin), and cypermethrin. They are described separately as follows: ① Fenpropathrin 20% emulsifiable concentrate formulation. The technical material is a brown liquid, insoluble in water, soluble in organic solvents, stable under neutral and acidic conditions, and easily decomposed and inactivated by alkali. This pesticide is a pyrethroid insecticide with the general characteristics of pyrethroid insecticides: broad-spectrum, high-efficiency, fast-acting, low residual toxicity, and long-lasting. This pesticide kills insects by contact action, stomach action, and antifeeding action. After mass poisoning, fish stop swimming, rise to the surface, dart about, and then stop at the bottom. In low-concentration water, fish show neurological poisoning symptoms that last for 1 day to 2 days; at high concentrations, fish die rapidly. Fenpropathrin has moderate toxicity to humans and livestock, and high toxicity to fish. ② Fenvalerate is a yellow oily liquid, soluble in xylene. Some fish poisoned by fenvalerate have congested gills and are prone to deformities. ③ Cypermethrin is yellow or brown, soluble in various organic solvents, and has contact, stomach, and antifeeding effects. It belongs to neurotoxic insecticides. When fish are poisoned in groups, they first show excitement, swimming wildly and erratically, then lose balance, twitch, become paralyzed, and are near death.
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Tuna Fishing and Ice-Fresh Processing Techniques
Tuna is a highly migratory marine fish with delicious meat and high nutritional value, deeply loved by consumers, and has therefore become one of the key fishing targets for fishing nations. I. Handling on Deck 1. Avoid bruising the fish: After the fish is on deck, it must not be allowed to thrash around, to prevent internal bruising. After bruising, it causes damage to 5 times the area of muscle, especially in the belly. The method is: place it on a carpet, press both hands on the fish's eyes, or strike the fish's head with a hammer, but be careful not to
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