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First, rice field preparation. Select paddy fields with more soil, reliable water sources, good water quality, and easy management. Tadpoles are more than 0.5 meters above the water surface. They are buried in the inner trenches and buried in trenches to prevent the loach from escaping. At the end of the field, there is an inlet and a water injection pipe. Divide 2 to 4 holding tanks with a width of 3m to 5m and a depth of 0.8m to 1m around the paddy field or in the corner of the field. The excavation area accounts for 2% to 5% of the total field area. One or two overflow ports are opened on the side of the dam on the side of the outlet, and a firm barrage is installed.
Second, the pro-Scorpion purchase. Intimate requirements for good shape, normal color, no disease and no injury. Females require a body length of 18 cm and a weight of 30 g or more. Males require a body length of 12 cm and a weight of 15 g or more. Mature females have larger individuals, short pectoral fins, rounded ends, tongue-shaped, prominent abdomen, cylindrical body, ectoderous valgus, red. The male skeleton is small in size, and its pectoral fins are long and narrow. They are sickle-shaped and their tips are pointed and upturned. When the water temperature is above 18°C, the quail species will be placed in a holding pond with a stocking density of 10 to 15 tails per square meter.
Third, close to nurture. One month before reproduction, the pro-growth of the well-developed gonads was intensively cultivated in the holding pool separately by female and male. The bottom of the pool is covered with 20 cm thick humus or soft corundum. The plants are placed in the pond and the water depth is 40-50 cm. Disinfect with clear lime or bleached clear pond for 1 week prior to putting it in contact. The feed used for cultivation is fish meal, soybean meal, rapeseed cake, rice bran, etc. Yeast flour and vitamins are added as appropriate. When the water temperature is above 20°C, the daily feeding amount is 5% to 7% of the weight of the pro-chondrites. Appropriate topdressing, change the water 1 to 2 times a week to keep the water quality fat and live.
Fourth, artificial oxytocin production. HCG 400-500 IU per female, plus luteinizing hormone-releasing-hormone analogue (LRH-A) 2 mcg, male dose halved. 0.2 ml per tail. After the injection, the relatives were placed in cages at the female and male ratios of 1:1.2 for fertilization. Place 30 to 50 fish nests made of poplar roots and palm pieces. When the water temperature is 21 to 25°C, the female lays eggs 11 to 13 hours later.
Fifth, seedlings hatch. Muddy eggs have very weak adhesion and should avoid oscillation when hatching. When the water temperature is 22 to 24°C, the film is removed after 48 hours. With water stimulation, the rate of release can be increased. The larvae that have just been stripped have a total length of about 2 mm and can swim after 4 days. The yolk sac disappears and they start eating. The stripping of the fry was completed and the ovaries were removed.
Sixth, kind of cultivation. Seedlings are cultivated in a holding pond for 15 to 20 days and then put into the field for cultivation. The feeds used were livestock and poultry viscera, pig blood, snail meat and rice bran, wheat bran, and bad residue. Daily feeding 1 to 2 times, mainly in the evening feeding, feeding amount accounts for 5% to 7% of the total fish body weight in paddy fields. It is necessary to topically apply the fermented livestock manure in fish ditch and fish slip. Disinfection of phenols, carbofuran, and other highly toxic pesticides is prohibited when rice is pest-treated. Usually, you should always check if there are any loopholes and whether the barrier is intact. It is forbidden to duck into the field.
VII. Wintering and fishing. After the rice is harvested, deepen the field water and let the pheasant breed winter in the fields. You can also choose to shelter the pond from the sun or deepen the water level in the fish ditch. Before winter, put piles of livestock and poultry manure in the four corners of the pond, both for fertilizer and water, but also for fermentation and warming. Loach seedlings can be caught by water flushing, food trapping or dry pond (field) capture.
A new technique of paddy field breeding muddy seedlings
In recent years, the development of mud aquaculture has gained momentum and there has been a shortage of seedlings. It is profitable to use rice fields to breed loach seedlings. Now Zhao Jinzhong, a professional householder in Huayuan Village, Yifeng Town, Yancheng City, Jiangsu Province, is using the technique of breeding muddy seedlings in paddy fields as follows.
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