Tong Kok fish, also known as local beard owl. The cultured pond horn fish has the characteristics of low investment and technical simplicity, and the fishes in pond angle have high growth rate, high population yield, and low oxygen tolerance, and can be cultured in high density. The artificial breeding technology of Tongjiao Fish is now described as follows:
(a) Pond conditions. Pond angle fish pond requirements are not very strict, the general pond of fish as long as the pond base is solid, no leakage, after a little modification can be used as a single pond pond pond fish. The water source of the pond requires sufficient water and good water quality. The area should be 0.13--0.2 hectares, and the water depth should be kept at 1-1.5 meters. The silt thickness at the bottom of the pool should be maintained at 20-30 cm to facilitate the activities and feeding of pond horn fish. As pond croakers have habits of gregarious and burrowing, some stones, tile tubes, bamboo tubes, etc. should be set up at the bottom of the pond, both for their habitat and for easy capture. High-density intensive ponds should also be equipped with aerators.
(b) Preparation before stocking. Before the fish species are stocked, the pool water is drained for 3-5 days. After simple dressing, it is thoroughly disinfected with quicklime. The dosage is 50-75 kg per 0.067 ha, and the whole pool is sprayed evenly after adding water. After 3 days, 50 to 60 cm of fresh water is injected. At this time, in order to cultivate plankton in the water in order to provide a large amount of natural food for the fish species, livestock and poultry excrement needs to be applied to the water. The amount of 200 to 300 kg per 0.067 ha is used. .
(c) Farming mode. Tong Kok Fish has auxiliary respiratory organs and can normally live in hypoxic water. Therefore, it is very appropriate to adopt a pond with high-density and single-nutrition mode. The individual fish species to be put in is suitable for more than 6.5 cm to avoid intraspecific killing. Stocking from 30,000 to 40,000 fish per 0.067 hectare, the fish stocks in the same batch are required to have neat specifications.
(IV) Feeding Management
1. Feeding technology. Feeding should follow the “four principles†of timing, positioning, quantitative, and qualitative. Fish angle in pond corner tends to be animalistic, especially for fresh animal bait, and live bait has a better feeding effect. The feed should be fed from the third day after the start of the fish species, mainly live bait or fresh animal internal organs, such as fly maggots, otters and other live baits can be directly fed after disinfection. The animal's internal organs need to be cleaned, and the minced meat machine is used to twist the meat into the dough and mix with the flour to make a paste. Feed 3 times a day for 1 month. It can then be transferred to the feeding pellet feed stage. The feed must be kept fresh, the protein content is 25% - 30%, and the daily feed amount is 5% - 8% of the total weight of the fish body. It can be increased or decreased as the weather changes and the fish eats and eats. , adjust the feeding amount every 15 days later. Feed twice a day, 8 to 9 am and 3 to 4 pm.
2. Water quality management. It is necessary to adjust the water quality in time to keep the water fresh. Every three to five days, inject fresh water into the pond, 10-20 cm each time, so that the pond maintains good water quality. Every month, the lime slurry is poured twice. Each dose is 10-15 kg per 0.067 hectare to improve water quality and prevent fish disease.
(e) Prevention and treatment of common fish diseases. Tong Kok fish has strong disease resistance, but it should be prevented early. In addition to strictly disinfecting the pond, it should be bathed with 3%--5% saline for 5 to 10 minutes in front of the fish pond.
Common fish diseases under artificial culture conditions include: (1) Saprolegnia. The disease occurred in late spring and early summer. After the fishes were caught in the ponds, they were infected with fish due to fishing and transportation. The diseased fish became irritable and uneasy, the movements were abnormal, the mucus in the skin increased, the appetite decreased, and finally they died of exhaustion. Control methods: Each 0.067 hectare at a depth of 1 meter with 1.5-2.5 kg of Chinese barley grind the boiled juice with residue. (2) enteritis disease. The disease is caused by feeding a mildewed feed during feeding or feeding unhygienic animal internal organs. The diseased fish was dark in color, and the abdominal cavity was significantly enlarged due to the accumulation of water. The intestinal wall was congested and reddish with inflammation, and the yellow abdomen was lightly pressed. Control methods: Each 50 kg of fish daily with 250 grams of garlic, salt 100 grams of mash and feed, can be 5 consecutive days. Or use 5 grams of “enteritis spirit†per 50 kg of fish. Stir in 0.5 kg of flour and warm the water to make a paste. Then mix the ingredients and feed for 3–5 days.
(a) Pond conditions. Pond angle fish pond requirements are not very strict, the general pond of fish as long as the pond base is solid, no leakage, after a little modification can be used as a single pond pond pond fish. The water source of the pond requires sufficient water and good water quality. The area should be 0.13--0.2 hectares, and the water depth should be kept at 1-1.5 meters. The silt thickness at the bottom of the pool should be maintained at 20-30 cm to facilitate the activities and feeding of pond horn fish. As pond croakers have habits of gregarious and burrowing, some stones, tile tubes, bamboo tubes, etc. should be set up at the bottom of the pond, both for their habitat and for easy capture. High-density intensive ponds should also be equipped with aerators.
(b) Preparation before stocking. Before the fish species are stocked, the pool water is drained for 3-5 days. After simple dressing, it is thoroughly disinfected with quicklime. The dosage is 50-75 kg per 0.067 ha, and the whole pool is sprayed evenly after adding water. After 3 days, 50 to 60 cm of fresh water is injected. At this time, in order to cultivate plankton in the water in order to provide a large amount of natural food for the fish species, livestock and poultry excrement needs to be applied to the water. The amount of 200 to 300 kg per 0.067 ha is used. .
(c) Farming mode. Tong Kok Fish has auxiliary respiratory organs and can normally live in hypoxic water. Therefore, it is very appropriate to adopt a pond with high-density and single-nutrition mode. The individual fish species to be put in is suitable for more than 6.5 cm to avoid intraspecific killing. Stocking from 30,000 to 40,000 fish per 0.067 hectare, the fish stocks in the same batch are required to have neat specifications.
(IV) Feeding Management
1. Feeding technology. Feeding should follow the “four principles†of timing, positioning, quantitative, and qualitative. Fish angle in pond corner tends to be animalistic, especially for fresh animal bait, and live bait has a better feeding effect. The feed should be fed from the third day after the start of the fish species, mainly live bait or fresh animal internal organs, such as fly maggots, otters and other live baits can be directly fed after disinfection. The animal's internal organs need to be cleaned, and the minced meat machine is used to twist the meat into the dough and mix with the flour to make a paste. Feed 3 times a day for 1 month. It can then be transferred to the feeding pellet feed stage. The feed must be kept fresh, the protein content is 25% - 30%, and the daily feed amount is 5% - 8% of the total weight of the fish body. It can be increased or decreased as the weather changes and the fish eats and eats. , adjust the feeding amount every 15 days later. Feed twice a day, 8 to 9 am and 3 to 4 pm.
2. Water quality management. It is necessary to adjust the water quality in time to keep the water fresh. Every three to five days, inject fresh water into the pond, 10-20 cm each time, so that the pond maintains good water quality. Every month, the lime slurry is poured twice. Each dose is 10-15 kg per 0.067 hectare to improve water quality and prevent fish disease.
(e) Prevention and treatment of common fish diseases. Tong Kok fish has strong disease resistance, but it should be prevented early. In addition to strictly disinfecting the pond, it should be bathed with 3%--5% saline for 5 to 10 minutes in front of the fish pond.
Common fish diseases under artificial culture conditions include: (1) Saprolegnia. The disease occurred in late spring and early summer. After the fishes were caught in the ponds, they were infected with fish due to fishing and transportation. The diseased fish became irritable and uneasy, the movements were abnormal, the mucus in the skin increased, the appetite decreased, and finally they died of exhaustion. Control methods: Each 0.067 hectare at a depth of 1 meter with 1.5-2.5 kg of Chinese barley grind the boiled juice with residue. (2) enteritis disease. The disease is caused by feeding a mildewed feed during feeding or feeding unhygienic animal internal organs. The diseased fish was dark in color, and the abdominal cavity was significantly enlarged due to the accumulation of water. The intestinal wall was congested and reddish with inflammation, and the yellow abdomen was lightly pressed. Control methods: Each 50 kg of fish daily with 250 grams of garlic, salt 100 grams of mash and feed, can be 5 consecutive days. Or use 5 grams of “enteritis spirit†per 50 kg of fish. Stir in 0.5 kg of flour and warm the water to make a paste. Then mix the ingredients and feed for 3–5 days.
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