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Aquaculture Measures to Improve the Survival Rate of Two-Year-Old Grass Carp Fingerlings
I. Main Reasons for the Low Survival Rate of Two-Year-Old Grass Carp Fingerlings 1. Pond not cleared or not thoroughly cleared before stocking Thoroughly inadequate pond clearing easily leads to poor pond bottom quality, with large amounts of pathogenic bacteria remaining on the pond bottom. When the weather is erratic as it has been this year and water quality is unstable, this will cause sporadic deaths of the fingerlings.
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Prevention and Treatment Methods for Liver Disease in Grass Carp Farming
1. Main Functions of the Liver The liver of the grass carp is located in the abdominal cavity and is the largest digestive gland. It is roughly divided into left and right lobes; the right lobe is larger, extends to the first bend of the intestine, and occupies the entire space of the first bend. The liver is mainly composed of hepatic lobules, and within the liver tissue
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Prevention and Treatment of Complications Such as Enteritis and Gill Rot in Grass Carp Fingerling Culture
Symptoms The diseased fish swim slowly and have reduced appetite; the scales on the fish body are basically intact; there are one or several varying furuncles on both sides of the dorsal fin, which feel relatively soft to the touch and have a swollen sensation, and when the furuncles are cut open, purulent and bloody fluid flows out; the anus is slightly red and swollen; the gill filaments are red and swollen, with
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Control Methods for Barley-Yellow Plague in Grass Carp Farming
Barley yellow and White Dew heart are the two key seasons when grass carp diseases occur at a high rate. At present, as air and water temperatures gradually rise, grass carp have also entered the season of high disease incidence. Grass carp barley-yellow plague refers to the mass mortality of grass carp caused by mixed infection of the two major diseases, grass carp branchial necrosis and red skin disease, around the time of barley yellow.
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Practical Experience Sharing on Cage Culture of Grass Carp
Grass carp mainly feeds on grass. It often inhabits places with lush aquatic plants and is a middle-to-lower-layer fish. Its optimum growth temperature is 20-30°C, and it has a large food intake. Above 32°C or below 15°C, its growth rate slows markedly and its food intake decreases. When the water temperature is below 10°C, it stops feeding and enters a state of winter dormancy,
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Measures for Promoting Fattening of Grass Carp in Autumn Farming
Autumn is the peak season for grass carp to put on weight. Doing a good job of feeding during this period can increase production by about 30% compared with normal management. Specifically, the following measures should be carried out well: 1. Regulate water quality, add new water to increase oxygen. First, add new water to increase the dissolved oxygen content in the water. Generally, add new water
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How to prevent and treat white head and white mouth disease in farmed grass carp
In home fish summer fry nursery ponds, the skin pigment from the tip of the snout to the eyeball of diseased fish fades to a milky white color, the lips appear swollen, and opening and closing become impaired, thereby causing difficulty in breathing. White head and white mouth disease is one of the serious diseases harming summer fry fish species (grass carp, black carp, silver carp, common carp, etc.)
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How to Increase the Current-Year Yield in Grass Carp Farming
The key to increasing the current-year yield of grass carp fingerlings is that the rearing and management methods must conform to the living habits of grass carp, achieving and maintaining clean water quality, no sources of disease, high dissolved oxygen, suitable feed, and timely disease prevention and control measures. 1. Do a good job of pond disinfection and fish body disinfection. When rearing fish
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Symptoms and Prevention and Control Methods of Hemorrhagic Disease in Grass Carp Aquaculture
Hemorrhagic disease is a fish disease caused by a reovirus. The virus particles are mostly spherical or hexagonal. The diameter of a complete virus particle is 68-72 nanometers, much smaller than the smallest bacterium. (1) Symptoms The main symptom of diseased fish is congestion. External symptoms generally show a slight reddish tinge, and in small fry, subcutaneous congestion can be seen under sunlight or lamplight. Some diseased fish also show congestion in the mouth, lower jaw, operculum, and base of the fins. When the skin of a diseased fish is peeled back, the muscles may show punctate or patchy congestion; in some cases the entire body musculature is congested, the gills are anemic and show "white gills," and patchy congestion of the gill lamellae may also occur, though some diseased fish show no such gill symptoms. The most common symptom in the internal organs is intestinal congestion; the whole intestine or part of it appears bright red due to congestion, and the mesentery and surrounding fat are also often accompanied by obvious punctate congestion, but the intestinal smooth muscle generally remains intact, with no rot or edema. A small number of diseased fish show grayish-white or locally congested liver, spleen, and kidney, and the swim bladder wall and gallbladder are often filled with blood streaks.
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High-yield and high-efficiency technology for two-season-per-year pond monoculture of grass carp
Pond monoculture of grass carp is one of the main aquaculture models in the freshwater fishery of Sha County, most of which belongs to traditional conventional culture, with small stocking size, long culture cycle, insufficient investment in aquaculture equipment, high labor intensity and low yield, generally 400kg-750kg per mu, with annual profit
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