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Analysis of the Causes of Hypoxia in Farmed Fish and Countermeasures
Hypoxia refers to a state in which the internal tissues and cells of a fish cannot obtain sufficient oxygen to maintain their normal functions. To distinguish it from oxygen deficiency in the water, it may be called "biological hypoxia" or "tissue hypoxia." Asphyxia (difficulty breathing) is a phenomenon that occurs during biological hypoxia, and "floating head" (gasping at the surface) is the manifestation of the difficulty breathing or asphyxia commonly seen in aquaculture production. There are two situations in which fish experience hypoxic asphyxia: one is when dissolved oxygen in the water is insufficient and air pressure is too low, so that even if the fish's respiratory function is normal, the tissue cells in its body cannot obtain sufficient oxygen, resulting in "anoxic hypoxia"; the other
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What kind of fish is the Red and White Wen-yu? Introduction to the Red and White Wen-yu variety
The Red and White Wen-yu (RedandWhiteWen-yu) has a red-and-white coloration; when the two colors are inlaid and left-right symmetrical, it is extremely beautiful and moving, and its value is also high.
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Pollution-free management key points for raising yellow catfish (Pelteobagrus fulvidraco) as a supplementary species in lotus ponds
Lotus ponds contain many benthic organisms, aquatic insects, plankton, and pond weeds, which can provide food for the fish, while the fish feces and leftover bait can provide fertilizer for the lotus, and the fish activity loosens the soil, providing good soil conditions for lotus growth. Because lotus leaves shade and block light, the light intensity in the lotus pond environment is relatively weak, which suits the yellow catfish's requirement for feeding and growth under low light. Pond construction. Choose a pond with abundant water sources, good water quality, fertile soil, flat terrain, convenient water intake and drainage, and strong water and fertilizer retention,
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How are fish body disinfection solutions prepared? Introduction to common formulas
Soaking and disinfecting fish bodies with medicated solutions is an indispensable task when stocking fish fry and fingerlings, and is an effective measure for preventing fish diseases. Here are several common preparation and application methods for soaking disinfection solutions. 1. Bleaching powder solution: Prepare at a dosage of 1 gram of bleaching powder per 100 kg of clean water, that is, a bleaching powder solution with a concentration of 10 mg/kg. At a water temperature of 10-15°C, soak the fish for 15-30 minutes. It can kill various pathogenic bacteria on the fish body and has a good effect on preventing bacterial red-skin disease and rotten
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After the fish gut water has been fermented, at what ratio should it be diluted with tap water to water flowers?
For topdressing, follow the principle of "apply thin fertilizer frequently, and determine the amount based on the growth condition." Human feces and urine should be diluted 20 to 30 times, while soybean cake water, urine water, and fish gut water should be diluted 10 to 20 times. For more questions, it is recommended that you contact Hu Yimin, who grows nursery stock and flowers, for consultation directly. Contact phone number: 0551-5326013. This way the results will be greater.
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Key points for autumn adult fish farming management
Regulating water quality. In autumn, the water temperature is suitable, making it the peak growing season for fish. Pond fish have strong metabolism and produce a lot of waste, so water quality management should be strengthened to improve the ecological environment. First, keep the pond water relatively deep to expand the water body's fish-carrying capacity, reduce the impact of the water temperature drop after autumn, and extend feeding time. Second, frequently add fresh water. Generally, add water three to four times a month, with each addition raising the water depth by 15 cm to 25 cm. Third, promptly spread quicklime. Do this once every half month, using 15 kg to 20 kg of quicklime per 667 sq m of water surface, dissolve it in water
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A detailed guide to the home-style method for dry-braised fish head
Ingredients: half a sea fish head (salmon or any other sea fish will do), 75 g minced meat, 1 stalk green garlic, half a tablespoon minced ginger and garlic. Seasonings: 1 tablespoon cooking wine, 2 tablespoons soy sauce, 1 tablespoon spicy bean paste, 1 tablespoon sugar, half a tablespoon vinegar, a little pepper, 2 cups water, half a tablespoon water starch. Method: 1. Wash the sea fish head, cut it in half lengthwise, wipe dry, pan-fry both sides in 5 tablespoons oil until colored, then remove; 2. Heat 2 tablespoons oil, stir-fry the minced ginger and garlic and the minced meat, then add all the seasonings
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Four key points to ensure fish fatten up in autumn
A fishing proverb says: In summer they grow shells, in autumn they grow flesh. When autumn turns cool, it is the peak season for fish growth, and the following four points must be well managed: 1. Manage feeding and fertilizing well. Generally, from September to November, both the amount of fertilizer applied and the amount of feed given should account for about 30% of the total for the whole year. When applying organic fertilizer, apply small amounts multiple times to avoid excessive fertilization causing pond fish to gasp at the surface; when applying inorganic fertilizer, use 5-7.5 kg of ammonium bicarbonate per mu, or 2.5-3.5 kg of urea. After "White Dew," grass resources gradually
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Prevention Methods and Technical Key Points for Fulminant Hemorrhagic Disease in Fish
Main measures to prevent fulminant hemorrhagic disease in fish: 1. Strengthen awareness of prevention. This disease has a sudden onset, spreads quickly, has a long epidemic season, and causes high mortality and heavy losses. Once an outbreak occurs, it is difficult to control, and the condition tends to recur. 2. Before fry and fingerlings are stocked into ponds, they must be disinfected by soaking in 1%-2% salt water. The soaking time depends on the fish's physique and the temperature. When conditions permit, fish fingerlings can be soaked with fulminant hemorrhagic disease vaccine. 3. Change water and increase oxygen in a timely manner. Keep the water quality fresh and change
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What Kind of Fish Is Salmon? A Full Analysis of Origins, Varieties and Characteristics
What is salmon? To answer this question, we must first clarify the origin of the name "salmon." According to research, the Chinese term "sanwenyu" was first proposed in Hong Kong, China and Taiwan, China, as a transliteration of the English name salmon, because the English pronunciation of salmon sounds similar to "sanwen," while the standard Chinese translation of salmon should be "damahayu" or "guiyu." Salmon is not a taxonomic name for fish, but a commercial name for certain salmonid or salmon-trout species. To qualify as salmon, its muscle must be firm and elastic
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