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Environmental Requirements and Management Techniques for Hatching in Rice Field Eel Aquaculture
The hatching rate of fertilized rice field eel eggs is affected by various environmental factors, among which the main ones are water temperature, dissolved oxygen and harmful organisms. (1) Water temperature The embryonic development of rice field eel is extremely closely related to water temperature. This is mainly shown in three aspects: first, embryonic development must be carried out at a suitable water temperature; too high or too low will cause a decline in hatching rate or embryonic deformity. Studies show that the suitable water temperature for embryonic development of rice field eel is 21-28°C, and the optimal water temperature is 24-26°C; second, within the suitable water temperature range, too large or too rapid a water temperature difference can also cause embryonic deformity or death, and it is usually required that the temperature change within a short time should not exceed 3°C, and preferably not exceed 1°C; third, the length of embryonic development time of rice field eel is directly affected by water temperature. At a water temperature of about 30°C (28-36°C), embryonic development takes 5-7 days, and at a water temperature of about 25°C, embryonic development takes 9-11 days.
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How should goose feed be formulated to be reasonable? A detailed explanation of goose-raising techniques
Principles for formulating goose feed formulas: select appropriate feeding standards according to the goose breed, developmental stage and production purpose, so as to meet the goose's physiological needs without causing nutritional waste; base the formula on local resources and, while ensuring nutritional content, reduce costs as much as possible so that breeders obtain greater economic benefits; choose raw materials with good palatability and a certain volume to ensure the goose takes in enough nutrition each time; combine multiple raw materials to bring into play their mutually complementary nutritional effects; control the amount of certain feed raw materials used, for example, legume hay meal is rich in protein and can be used at 15%-30% in the daily ration, while feather meal, blood meal, etc. have low digestibility and should be added at below 5%; the raw materials selected should be of good quality, with no mold or deterioration and no pesticide contamination.
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Detailed Explanation of Key Techniques for Mixed Culture of Snails and Earthworms
Using a multi-tiered frame with multi-level flat netting for mixed culture of snails and earthworms can achieve the goals of low energy consumption, small space, simple management, and rapid high yield. I. Variety Selection For snails, the White Jade snail can generally be used, but it is best to use the more cold-tolerant French Light Great snail, so that it can grow and reproduce in sync with earthworms throughout the four seasons. For earthworms, choose species that grow and develop quickly, have strong reproductive capacity, broad adaptability, long lifespan, and are easy to domesticate and manage. At present, the most ideal varieties are Beixing No. 2 and Daping No. 2.</p><p>II. Culture Method Idle houses or plastic greenhouses can be used for culture. Snails are cultured using multi-tiered frames with multi-level flat netting, while earthworms are cultured in boxes. The multi-tiered frame is 3 m long, 1.2 m wide, and 3 m high, with 11 tiers of bed frames arranged from top to bottom, each tier 20 cm apart, and the lowest tier 60 cm above the ground. Each tier is fixed with nylon netting stretched tight to form a supporting net bed. The mesh of the top 1-2 net beds is 1 mesh or larger, so that egg-laying breeder snails cannot pass through the mesh, while medium and young snails can fall through the mesh. The mesh of the 3rd-4th net beds is 2 mesh, the 5th-6th net beds is 3 mesh, the 7th-8th net beds is 4 mesh, the 9th-10th net beds is 6 mesh, and the bottom net bed is 8 mesh. On one side of the topmost net bed, make an egg-laying and hatching bed 30 cm wide and 25 cm high, and place hatching substrate about 20 cm thick into the egg-laying and hatching bed. The substrate is made by mixing sawdust, rice straw (cut into 2 cm lengths), and garden soil at a ratio of 1:1:1 and fermenting the mixture. Apply lime slurry around each tier of the frame to prevent snails from crawling off the net beds.</p><p>The bottom layer of the multi-tiered frame is enclosed with wooden boards to form a box 30 cm high. Place 10 cm thick garden soil into the bottom of the box, then add fermented material of rotted cow dung or pig dung and rice straw, and mix in 20% well-fermented sawdust as feed for the earthworms. The moisture content of the feed should be kept above 60%.</p><p>III. Stocking and Culture When the temperature is above 15°C, stocking and culture can begin. The top tier of the frame is the breeder snail tier, and outbred parent-line breeder snails can be stocked at a density of 200 per sq m. Breeder earthworms can be stocked at 2.5 kg per sq m (about 5,000 individuals).</p><p>Snails have a very broad diet. Various vegetables, aquatic plants, crop stems and leaves, and even the leaves of broadleaf trees can all be used for feeding. Earthworms have an even more omnivorous diet; almost all plant residues, humus, decaying animals, and household garbage are their food. When feeding, wash the green feed and place it directly on the 1st-2nd net beds. In this way, the small fragments left after the breeder snails eat will fall into the net beds below and become feed for the medium and young snails, while the feces and food residues produced by the snails on each net bed fall onto the earthworm bed and become food for the earthworms. According to estimates: 5 kg of large snails (about 100 individuals) excrete about 0.3 kg of feces per day, and together with the snails' food residues, this can feed more than 0.5 kg of earthworms. When the young snails bred by the breeder snails fall downward and become distributed among the net beds on each tier, the snails' feces and food residues are basically enough to feed the earthworms in the earthworm bed. In this way, not only is the tedious work of feeding and cleaning feces reduced, but the feed utilization rate is also greatly improved.</p><p>IV. Key Management Points With reasonable regulation of the environmental ecology, snails and earthworms have almost no threat of disease.</p><p>1. Temperature The temperature should be kept above 20°C. If the temperature reaches 30°C, attention should be paid to taking cooling measures. If the temperature is below 15°C, heating should be carried out.</p><p>2. Light Snails and earthworms are both shade-loving animals and have the habit of hiding by day and coming out at night. During culture, pay attention to the amount of light. The illuminance of one 3-watt bulb per 10 sq m in a dark room is suitable.</p><p>3. Humidity Snails and earthworms both like humid environments. The indoor air humidity should be kept at 60%-70%. The humidity of the snail hatching substrate should be kept at 30%-40%, while the humidity of the earthworm feed should be kept at 60%-66%. Snail feed should be soaked and then fed.</p><p>4. Air High-density culture of snails and earthworms will produce large amounts of harmful gases. Therefore, attention should be paid to frequent ventilation to maintain sufficient oxygen. At the same time, during their life activities, earthworms will continuously deposit feces on the surface of the feed, so the earthworm feces should be cleaned frequently to facilitate air circulation.</p><p>5. Grading and Harvesting</p><p>Grading of snails Snails have the habit of the large eating the small, so large, medium, and small snails of different ages in months cannot be mixed. Net beds with different mesh sizes are used for culture so that the snails automatically screen and grade themselves, that is, snails of different sizes will retract their heads when frightened (such as by strong light or vibration) and tumble down to the lower tier. When snails of each grade grow to the age in months of the next higher grade, manual selection is needed. At the same time, the adult snails above can all be harvested.</p><p>Harvesting of earthworms When most earthworms in the bed have reached a body weight of 400-500 mg, at which point the density per sq m has reached 15,000-20,000 individuals, most of the adult earthworms can be harvested.</p>
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How to raise large silkworms well? Master these key techniques
Sericulture has a history of several hundred years in our country. In ancient times, people began to plant mulberry and raise silkworms, and since ancient times our country's silk industry has been developing quite well; therefore, our country's experience and techniques in sericulture are very rich. Below
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Management techniques for the hatching and metamorphosis stages in forest frog farming
In mid-March, the water temperature in the Suzhou area is generally around 915~C, and the fertilized eggs hatch into tadpoles after about 5 days, with a hatching rate of about 85%. The main factor affecting the hatching of fertilized eggs is temperature: when the water temperature is below 6~C, both the hatching speed and the hatching rate decrease markedly. Light itself
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Key Technical Points and Methods for Snail (Field Snail) Farming Explained
Farmers can achieve considerable economic benefits by using small water surfaces or rice paddies to farm field snails. The field snail farming techniques are introduced as follows: 1. Selection of field snail farming site. The field snail farming site should be chosen in a place with abundant water, good water quality, humus soil and convenient transportation.
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What are the four key points to get right in intensive snakehead culture? Detailed techniques
To achieve high yield and good returns in intensive snakehead culture, four key points must be got right. 1. Seed stock: Snakehead is hardy and highly resistant to disease, but during the fry stage the incidence of disease and mortality rate are relatively high. For pond intensive culture, the stocking size of seed stock should be within 100 fish per kg. Such seed stock is close to adult fish in all respects, has a high survival rate after stocking, and is easy to raise. At the same time, note that the seed stock should be uniform in size, free of disease and injury. Deformed fry with a big head and small tail, improper proportions, or protruding eyeballs must not be introduced for stocking.
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Eco-friendly Turtle Farming in Courtyards: Models and Techniques
Eco-friendly turtle farming in courtyards can regulate water quality, enrich food sources, greatly reduce feeding costs, prevent disease outbreaks, and meet the growth and development requirements of turtles. The results and key technical points of courtyard eco-friendly turtle farming are described below. 1. Design and construction of the farming pond Farming
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Detailed Explanation of Key Points in Gamefowl Breeding and Management Techniques
In China, the raising of gamefowl has always continued the folk methods of dispersed feeding by individual households and separate training. Generally, each household keeps only 1 to 2 roosters and 4 to 6 hens. This raising method can ensure the purity of the offspring's bloodline and is also conducive to the separate training and management of roosters.
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Key Technical Points and Scientific Feeding Management Methods for Wild Duck Farming
1. Artificial incubation methods for wild ducks. For small-scale wild duck farming, traditional incubation methods are used; for large-scale wild duck farming, it is generally necessary to purchase computer-controlled fully automatic incubation equipment. Before incubation, select breeding eggs with a high fertilization rate, clean and disinfect them, and the breeding eggs
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