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Key Technical Points for Grouper Culture in Earthen Ponds
Grouper is delicious and comes in a dazzling variety of forms, and is deeply loved by consumers everywhere. At present, cage culture is common in our country, but as the marine environment changes, cage culture suffers from more diseases that are difficult to control, so promoting grouper culture in earthen ponds is highly worthwhile. 1. Pond selection
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Key Management Techniques for Rearing Snakehead Fry in Earthen Ponds
Snakehead is one of the most common fish in our daily lives, and its nutritional value is very high. We all know that fish is rich in protein, and eating fish regularly is very helpful for human health, so we can eat more fish in our daily lives. Farming snakehead
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What are the breeding methods for river crab seedlings in earthen ponds?
I. Earthen pond river crab seedling rearing Earthen pond river crab seedling rearing refers to the method of artificially rearing river crab larvae in excavated ponds using natural seawater in coastal areas. This method is low in cost, simple and practical, and is suitable for specialized crab farming households. In addition to the rearing pond, earthen pond crab seedling rearing
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Detailed Explanation of Key Technical Points for Eel Farming in Earthen Ponds
Eel, also known as white eel, white loach, etc., is a valuable fish species for freshwater aquaculture. Its flesh is tender, its flavor delicious, and its nutritional value high; it has medicinal effects such as removing blood stasis and promoting tissue regeneration, and nourishing and tonifying the body. Eel grows rapidly and has strong adaptability; even in waters with very little dissolved oxygen where other fish cannot survive, it can live normally. The technical requirements for artificial farming are not high, and feed sources are also plentiful.
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How to Do a Good Job in Overwintering and Seed Stock Preservation for Tilapia in Earthen Pond Aquaculture
Tilapia, commonly known as: African crucian carp, non-crucian, Vietnamese fish, Nanyang crucian, etc. It originally referred to the fish species of the genus Oreochromis with Mozambique as the type locality: Mozambique mouthbrooder (scientific name: Oreochromis mossambicus). It is now the collective common name for several fish species of the genera Oreochromis and Sarotherodon in the family Cichlidae; in English they are collectively called Tilapia. It is now a freshwater aquaculture fish that is a key research and breeding target of the world's aquaculture industry, and is hailed as one of the main future sources of animal protein. It usually lives in freshwater, can also live in salt water with different salinity levels, and can also survive in shallow water in lakes, rivers, and ponds. It has strong adaptability, can reproduce even in small water areas, can even grow in rice fields, and has extremely strong adaptability to water with low dissolved oxygen. The vast majority of tilapia are omnivorous, often eating aquatic plants and debris.</p><p></p><p>There are many methods for overwintering and seed stock preservation of tilapia, but some are limited by resource conditions, with no hot springs or no warm drainage, and some have complex equipment and high investment. In order to explore a mass-oriented seed stock preservation method with low investment and simple equipment. Its main facilities and techniques are: </p><p>1. Construction of the overwintering pond: The tilapia overwintering pond should be built in a low-lying area that is sheltered from the wind and faces the sun, close to a river. In a place with solid soil, dig an earthen pond 4 m to 5 m long, 1 m to 2 m wide, and 2 m to 3 m deep. Water from the river channel can gradually seep into the earthen pond through the gaps in the soil layer, keeping the pond water fresh and the oxygen content sufficient. </p><p>2. Heat preservation facilities: Build a bamboo frame on the pond surface sloping toward the south, and cover the bamboo frame with two layers of plastic film, like a greenhouse for growing vegetable seedlings. The height between the pond surface and the film should be kept at about 0.1 m to 0.8 m; if the space is too large, it is not easy to keep warm. When the northwest wind blows, windbreak walls made of reeds or straw curtains should be made on the west and north sides of the overwintering pond. In frost and snow weather, straw curtains should be added over the film. If a cold wave invades and the temperature drops, 2 to 4 electric lights of 100 W to 200 W should be hung inside the plastic shed to raise the water temperature. In short, the pond water temperature should be kept at around 15°C to 16°C so that the fingerlings can safely pass the winter. </p><p>3. Putting fingerlings into the pond: Before the fingerlings are put into the pond, the overwintering pond should be filled with water and soaked for 3 days to 5 days to eliminate the effect of pollutants on the pond water. The time for putting fingerlings into the pond is generally in early November, and the water temperature should preferably be around 16°C; if too late, they are prone to cold damage. Before the fingerlings are put into the pond, they should be soaked in 4% salt water for 3 minutes to 5 minutes to disinfect the fish body and prevent infectious diseases. The density of fingerlings is 5 kg to 7.5 kg per cubic meter. </p><p>4. Overwintering management: During the entire overwintering period, specially assigned personnel should be on duty for management. At the same time, attention should be paid to changes in water temperature, changes in water quality, and the dynamics of the fish. </p><p>(1) Feeding: During the overwintering period, a small amount of feeding may be done, generally once every 10 days to 15 days, with the feeding amount at about 1% of the weight of the overwintering fingerlings, but when the water temperature exceeds 16°C, they can be fed once a day. Feed includes sugar dregs, rapeseed cake, etc. It should also be flexibly controlled according to the feeding situation so that the fish eat enough and eat well, in order to increase the overwintering survival rate and reduce losses.</p><p>(2) Lighting: Throughout the winter, as long as it is sunny, remove the straw curtains covering the heat preservation shed from 9:00 to 15:00 to let in light and raise the temperature. On snowy days, the snow on the frame should be swept off promptly to prevent the frame from being crushed and collapsing.</p><p>(3) Prevention and treatment of fish diseases: The overwintering period of tilapia is relatively long, and attention should be paid to observing whether there is fish disease. Once discovered, it should be treated promptly. During the overwintering period, saprolegniasis is the most common, mostly occurring after entering the pond and before leaving the pond. Saprolegniasis is a common disease caused by the attachment of fungi such as Saprolegnia and Pythium. With the naked eye, a grayish-white, soft, cotton-wool-like substance attached to the fish body can be observed. Injured fish bodies are highly susceptible to infection, and it occurs more frequently in winter and early spring. For treatment, alkaline green at a concentration of 0.1 mg to 0.2 mg/L or a copper sulfate solution at a concentration of 1 mg/L can be splashed over the whole pond, and it is effective. If pond oxygen deficiency occurs and fish gasp at the surface, more fresh water can be exchanged. </p>
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How to Raise Chinese Striped-neck Turtle Hatchlings? Detailed Guide to Breeding Methods and Tips
Abstract Breeding pond: You can choose earthen ponds, brick-and-stone ponds or cement ponds for breeding. Water quality: Choose fresh light green water and change the water regularly to maintain water transparency. Feeding: Animal-based and plant-based bait can be fed in the early morning and must be kept fresh. Water temperature: Suitable for growth
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Key Technical Points and Daily Management Methods for Black-Spotted Frog Farming
Abstract Select an earthen pond or rectangular cement pond for farming. Shade boards need to be built over the pond surface, and a small amount of floating aquatic plants can be placed in the pond water. Place the collected fertilized eggs of the black-spotted frog into the disinfected ring ditch of the farming pond for hatching, and keep the water temperature at around 20-25°C. After the black-spotted frog tad
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How to raise shrimp in earthen ponds most successfully? With notes
Summary Clearing the pond: ensure the water depth is above 1.5m, and use bleaching powder to remove wild species. Stocking seedlings: stock 30,000-40,000 fry per mu. Regulating water quality: when the pond water transparency drops to 15-20cm, change the water once. Reasonable feeding: shrimp need to be fed 6 times a day in the late stage of grow-out.
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What are the key technical points of Taishan eel farming in earthen ponds?
The Taishan earthen pond eel farming model is an extensive farming model developed by referring to the earthen pond farming model for Chinese carp. Its characteristics are: ① The ponds are large, generally more than 4 mu, up to 20-30 mu, and developed in contiguous tracts; ② The stocking density is low; ③ Water sources are insufficient, and the water is used for a whole grow-out cycle, with a water depth within 1.2 m; ④ The soil quality is good, mainly loam; ⑤ Aeration facilities are fully equipped; ⑥ The feeding method is to feed to satiation at every meal until feed remains; ⑦ The annual grow-out rate is above 90%. Taishan earthen ponds are mostly developed from land created by reclaiming land from the sea and enclosing it into fields, and the soil is mostly loam, with water retention performance.
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What is the relationship between diseases of eels raised in earthen ponds and the water environment?
The water environment is the decisive factor in eel farming. The water environment not only determines whether eels can be farmed, but also directly affects the level of production and ultimately the economic benefits of farming. Therefore, only by improving the water environment can eels be farmed well. The following analysis focuses on the relationship between eel diseases and the water environment from the following aspects. 1. pH level. The pH value in water is an important comprehensive water quality indicator, and it directly affects the physiological condition of eels. When the biological, chemical or physical components in the water body change, they will all be reflected in the pH value. Eels in earthen ponds require the pond water
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