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What diseases are fish prone to when suffering from malnutrition?
With the rapid development of factory farming, the use of compound feed is becoming more and more widespread. However, some compound feeds cannot meet the nutritional needs of fish due to raw material problems or formulation technical problems. In particular, feed designed, formulated, processed and produced by small feed mills and farmers themselves may cause nutritional deficiencies or excesses, weakening the fish's constitution and, in severe cases, causing fish death. This article will discuss the causes of fish diseases from the nutritional aspect, in order to guide farmers to take timely measures in breeding production to prevent fish diseases.
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Ten preventive measures to take during the peak growing season for adult fish
1. Prevent starvation. During the peak growing season, adult fish have a large food intake, so more bait and feed should be given. For ponds mainly stocked with grass carp, crucian carp, tilapia, etc., mixed feed such as wheat bran, oilseed cake meal and soybean dregs, as well as fresh feed such as tender grass and plant stems and leaves, should be given. Under normal circumstances, the daily amount of coarse feed accounts for 10% of the total fish in the pond. 2. Prevent fertilizer shortage. During the peak growing season, the amount of fertilizer required by fish accounts for 80% of the fertilizer to be applied during the whole period, so every 5 to 7 days, apply 60 kg to 100 kg of fully fermented human and livestock manure per mu, and 2 to 3 kg of nitrogen and phosphorus chemical fertilizer.
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Several Causes of Fish Gasping at the Surface and Their Prevention and Treatment Methods
Fish "gasping at the surface" is a phenomenon that frequently occurs in aquaculture production, and it is also an important sign for judging whether fish are diseased and whether water quality has changed. However, many farmers, after discovering pond fish "gasping at the surface," do not understand the cause and simply apply medication based on "experience," which often proves ineffective and may even cause mass mortality. In fact, fish "gasping at the surface" can be caused by multiple factors. According to the cause, "gasping at the surface" can be divided into the following 3 types. 1. Hypoxia-induced gasping. Hypoxia-induced gasping is caused by excessively low dissolved oxygen content in the water, causing cultured fish to swim to the relatively higher surface
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Why is the Mandarin fish hailed as the finest of fish?
The Mandarin fish, also called the Chinese perch or jihua fish, has long been regarded as the "finest of fish." Its flesh is plump, thick yet tender, delicious in taste, and has very few bones. As a delicacy at banquets, it is deeply loved by people, and it is at its fattest and most succulent every spring, which is why it is also called the "fresh seasonal delicacy of spring." There are many ways to eat Mandarin fish: it can be steamed, boiled, braised, simmered, roasted, or fried, and it can also be made into dishes of various shapes and designs, such as "Wulong Mandarin Fish," "Char Siu Fine Fish," and "Sweet and Sour Fine Fish," all of which are famous banquet dishes. Because the fine fish is sweet and neutral in nature and flavor, enters the spleen and stomach meridians, and contains 18.5% protein
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What are the correct methods for selecting fishery drugs?
Aquaculture farmers should select fishery drugs or feed medication additives based on the pathogens of the cultured species and the instructions for the fishery drugs. The selected medicated feed additives should comply with the provisions of the "Regulations on the Administration of Feed and Feed Additives" (Annex 2). Drugs or additives prohibited by the state (Annex 3) must not be used, nor should feed with added antibacterial drugs be stored for long periods. Before selecting fishery drugs, the disease should first be diagnosed, and then the fishery drugs should be accurately selected by considering the drug, pathogen, environment, the cultured animal itself, and human health.
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What are the fish species for rearing adult fish? Introduction to common species
Rearing adult fish in rice paddies means placing winter fingerlings or large-size fingerlings into the paddy field to grow into large fish. Adult fish are also called food fish or commercial fish, meaning they can be eaten or sold as a commodity. The species for rearing adult fish in rice paddies are mainly herbivorous fish and omnivorous fish, with filter-feeding fish as a supplement, and multiple fish species are polycultured. Herbivorous fish include grass carp and bream; omnivorous fish include common carp, Pengze crucian carp, and others; filter-feeding fish include silver carp and bighead carp. In addition, fish suitable for rearing in rice paddies also include loach, yellow eel, tilapia, snakehead, and catfish. These fish
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How harmful is oleander to goldfish?
Oleander, also known as willow-leaf peach, belongs to the genus Nerium in the family Apocynaceae. It has been introduced into China for a long time and is cultivated in various places; it is a common ornamental flower in gardens. The entire oleander plant is highly toxic, and accidental ingestion by humans or livestock is dangerous. There are numerous instances in which oleander leaves, petals, fruits and small branches falling into goldfish tanks have caused the death of all the young and adult goldfish. The reason is that oleander mainly contains cardiac glycosides such as yellow oleandrin A, yellow oleandrin B, oleandrin A, yellow oleandrin A monoside methyl, yellow oleandrin A monoside ethyl and yellow oleandrin C, which have highly toxic effects on fish and can cause acute
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Detailed recipe and steps for clay pot fish head
One fish head, scaled and washed clean, a little scallion and ginger. Tofu is essential. If the fish head is too big, it needs to be cut into pieces, otherwise it is inconvenient to eat. Prepare a wok, add oil, the oil should be hot. Put clean water in the clay pot and set aside. Add the scallion and ginger, and stir-fry. Add the fish head and stir-fry, add a little cooking wine. Then put it into the clay pot. After it comes to a boil, add the tofu. Add salt and simmer over low heat for 10 minutes, and it is ready.
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Three defenses to do well in winter fish farming management
In winter, the water temperature is low and there is little light, so there is less phytoplankton in the pond water of fish ponds and the oxygen-producing capacity is poor. Because fish feed and move less, their constitution is relatively weak, which has a great impact on safe overwintering and growth. To ensure the safety and growth of fish in winter, the water quality regulation and management of fish ponds in winter should focus on three defenses. Guard against shallow water. Some fish farmers believe that shallow pond water in winter is good for fish, but in fact this is a misunderstanding. In winter, when the pond water level is shallow, the water temperature changes quickly and the temperature difference is large, which will cause freeze damage to fish and is extremely unfavorable to their overwintering and growth. Winter fish ponds
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What kind of fish is the Mengding new loach? Let us introduce you to this freshwater fish species
Common name: Mengding new loach. Origin and season: distributed in the tributaries of the middle reaches of the Nujiang River. Description: The upper and lower lips are very thick and join into a single whole at the corners of the mouth. The lower jaw is noticeably shifted back, thereby forming a preoral chamber enclosed by the upper and lower lips in front of the lower jaw, and its inner wall is covered with dense protrusions. Males have a suborbital flap, and the first branched pectoral fin ray is thickened. A small fish, it inhabits the bottom layer of river sections with gravel substrate, feeds mainly on animal food, and is relatively few in number. Its coloration is unique and it has ornamental value.
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