In 1998, we chose a 2-mu pond in the Taixing Aquatic Products Breeding Center to carry out the polyculture experiment of spotted fork tail and Chinese sturgeon, and achieved good results. The situation is summarized as follows:
1. Pond condition: The pond is numbered No. 7, normal water level is 1.2m to 1.5m, north-south direction, water area is 1334c sq.m., and 50(cm (width) 70cm (height) 5cm (thick) prefabricated panels are used as fence facilities , Intake and drainage are separated, the water source is the river that flows straight through the Changjiang River, the pond is equipped with a 2.2kw aerator, and the adjacent pond No. 6 is the same area with the same density, the same size as the main fish control pond.
2, test materials:
2.1 Seedlings: (1) The species of catfish for channel catfish was cultured from the Dykesa series of blue-and-white spider yolks introduced directly from the United States in May 1997; (2) The species of Chinese sturgeon was the Field cubs. 2. Feed: (1) The pellet feed used for the channel catfish was purchased from the American Soybean Association's full-price buoyant feed produced by Shanghai Fushoutai Co., Ltd.; (2) The feed was purchased from Zhenjiang Changjiang Co., Ltd. ?
3 test methods?
3.1 Seed stocking 3.1.1 Catfish rearing for fry rearing On January 2, 1998, 75kg of quick-lime Wangtang was used per 667 square meters, and on January 9th, it was 1.5m deep into river water, and when it was flooded, it was sieved with 120 meshes. Filtration; On January 10th, select 800 fish tails of the same size, robust and disease-free, and weight 36 kg (average tail weight 45 g) into the test pond, while laying 200 tails per kilogram. Fish stocks were immersed in 3% saline for 10 minutes. 3.1.2 One species of stocking On April 20, 1998, 1,100 self-breeding Chinese sturgeon species were bred in the wintering season in Waitang and weighed 137.5 kg. (On average only 125 grams). The stocking puppies are neat in size, free from disease, injury, and tumbling quickly. When stocking, sterilize with 3% saline solution. ?
3.2 Feed Feeding 3.2.1 Catfish feeding After mid-March, it began to feed into bait management. Light was fed with domesticated fish for 10 days and the feed was fed in two flashes at 10:00 a.m. each morning. At 4:30 in the afternoon, the fish were buoyant for food. According to the "Four Sets" principle, to ensure that fish eat well, eat enough, each feeding amount to finish eating in 5 minutes is better. The daily feed amount is 3% to 5% of fish body weight. As of October 30, 967.5 kg of granular material was fed. 3.2.2 Dipping and feeding The powdered dips are mixed with soybean oil, fresh leaves, and knead blocks are placed at the junction between the straight slope and the pool water, and the feeding time is 9:00 and 16:00 every day. Two hours after the bait checked once, it was found that the bait was promptly removed, and the amount of feeding was adjusted in time according to the condition of the bait. The feeding amount was 375 kg. ?
3.3 Strengthen water quality management and prevent fish diseases in a timely manner. From April to September, change water 50cm every half a month to maintain fresh water, adequate dissolved oxygen, moderate ammonia, and the transparency is always controlled at 30-35cm. In terms of disease prevention, we will pay attention to the disinfection of water companions, and once a month, the whole pool will be splashed with bleach, with a dosage of 1 mg/c. ?
4 results?
4.1 Harvesting Clear ponds on November 3, 1998. The results are shown in Table 1.
4.2 Inputs and Outputs 4.2.1 Input pond water fee is 1,600 yuan, electricity fee is 204 yuan, wages are 1,596 yuan, feed fee is 3,386.25 yuan, seedling fees are 22,750 yuan (fish species are priced at 3.00 yuan/tail, and young animals are charged at 6 yuan/only ), depreciation costs 300 yuan, totaling 29,836.25 yuan. 4.4.2 The output value of the turtle is 29,000 yuan, the fish is 10372.5 yuan, and the carp is 400 yuan, which is 39772.5 yuan. 4.2.2 Economic benefits (net profit) 9936.25 yuan, 4968.12 yuan per 667 square meters. ?
5 Summary and experience?
5.1 Feeding special buoyant pellet feeds for spotted prongs is better than feeding pellets. There are two main points: (1) The maturation of floating materials is high, and the digestion and absorption rate is also better than sinking materials; (2) ) The floating material floats on the surface of the water, which not only controls the amount of feeding, reduces waste, but also can observe the eating conditions of the fish population, whether there is disease, and the size of the individual. ?
5.2. There is a strong attack on the catfish tail and the group prefers to grab food. In order to reduce the scratches caused by the collision between the two, the feed should be scattered as far as possible. This will also allow the smaller spots to obtain food. ?
5.3 Compared with the same density and same specification of the single-channel brown-catchment control pond, the aquaculture machine started to significantly reduce the aerator, which may move with the turtle up and down, neutralize the underlying oxygen performance, keep the entire pond water body It is related to more adequate dissolved oxygen. ?
5.4 According to trial and trial comparison, there are three points that polypodium and polypodium have polyculture. It is worth noting: (1) feeding time, food table should be staggered, should be fed turtle material, first feed fish, otherwise affect the fish to eat, especially It is a large-sized turtle that has a great influence on the fish's food intake; (2) After the fish is caught in the winter, due to the large size of the fish, the "buried pond phenomenon will affect the turtle's hibernation; (3) the fish's pectoral fins are hard, and Like "burial pond", it has brought certain difficulties to capture, how to improve the fishing method, making the operation more convenient is worth further exploration in the future.
1. Pond condition: The pond is numbered No. 7, normal water level is 1.2m to 1.5m, north-south direction, water area is 1334c sq.m., and 50(cm (width) 70cm (height) 5cm (thick) prefabricated panels are used as fence facilities , Intake and drainage are separated, the water source is the river that flows straight through the Changjiang River, the pond is equipped with a 2.2kw aerator, and the adjacent pond No. 6 is the same area with the same density, the same size as the main fish control pond.
2, test materials:
2.1 Seedlings: (1) The species of catfish for channel catfish was cultured from the Dykesa series of blue-and-white spider yolks introduced directly from the United States in May 1997; (2) The species of Chinese sturgeon was the Field cubs. 2. Feed: (1) The pellet feed used for the channel catfish was purchased from the American Soybean Association's full-price buoyant feed produced by Shanghai Fushoutai Co., Ltd.; (2) The feed was purchased from Zhenjiang Changjiang Co., Ltd. ?
3 test methods?
3.1 Seed stocking 3.1.1 Catfish rearing for fry rearing On January 2, 1998, 75kg of quick-lime Wangtang was used per 667 square meters, and on January 9th, it was 1.5m deep into river water, and when it was flooded, it was sieved with 120 meshes. Filtration; On January 10th, select 800 fish tails of the same size, robust and disease-free, and weight 36 kg (average tail weight 45 g) into the test pond, while laying 200 tails per kilogram. Fish stocks were immersed in 3% saline for 10 minutes. 3.1.2 One species of stocking On April 20, 1998, 1,100 self-breeding Chinese sturgeon species were bred in the wintering season in Waitang and weighed 137.5 kg. (On average only 125 grams). The stocking puppies are neat in size, free from disease, injury, and tumbling quickly. When stocking, sterilize with 3% saline solution. ?
3.2 Feed Feeding 3.2.1 Catfish feeding After mid-March, it began to feed into bait management. Light was fed with domesticated fish for 10 days and the feed was fed in two flashes at 10:00 a.m. each morning. At 4:30 in the afternoon, the fish were buoyant for food. According to the "Four Sets" principle, to ensure that fish eat well, eat enough, each feeding amount to finish eating in 5 minutes is better. The daily feed amount is 3% to 5% of fish body weight. As of October 30, 967.5 kg of granular material was fed. 3.2.2 Dipping and feeding The powdered dips are mixed with soybean oil, fresh leaves, and knead blocks are placed at the junction between the straight slope and the pool water, and the feeding time is 9:00 and 16:00 every day. Two hours after the bait checked once, it was found that the bait was promptly removed, and the amount of feeding was adjusted in time according to the condition of the bait. The feeding amount was 375 kg. ?
3.3 Strengthen water quality management and prevent fish diseases in a timely manner. From April to September, change water 50cm every half a month to maintain fresh water, adequate dissolved oxygen, moderate ammonia, and the transparency is always controlled at 30-35cm. In terms of disease prevention, we will pay attention to the disinfection of water companions, and once a month, the whole pool will be splashed with bleach, with a dosage of 1 mg/c. ?
4 results?
4.1 Harvesting Clear ponds on November 3, 1998. The results are shown in Table 1.
4.2 Inputs and Outputs 4.2.1 Input pond water fee is 1,600 yuan, electricity fee is 204 yuan, wages are 1,596 yuan, feed fee is 3,386.25 yuan, seedling fees are 22,750 yuan (fish species are priced at 3.00 yuan/tail, and young animals are charged at 6 yuan/only ), depreciation costs 300 yuan, totaling 29,836.25 yuan. 4.4.2 The output value of the turtle is 29,000 yuan, the fish is 10372.5 yuan, and the carp is 400 yuan, which is 39772.5 yuan. 4.2.2 Economic benefits (net profit) 9936.25 yuan, 4968.12 yuan per 667 square meters. ?
5 Summary and experience?
5.1 Feeding special buoyant pellet feeds for spotted prongs is better than feeding pellets. There are two main points: (1) The maturation of floating materials is high, and the digestion and absorption rate is also better than sinking materials; (2) ) The floating material floats on the surface of the water, which not only controls the amount of feeding, reduces waste, but also can observe the eating conditions of the fish population, whether there is disease, and the size of the individual. ?
5.2. There is a strong attack on the catfish tail and the group prefers to grab food. In order to reduce the scratches caused by the collision between the two, the feed should be scattered as far as possible. This will also allow the smaller spots to obtain food. ?
5.3 Compared with the same density and same specification of the single-channel brown-catchment control pond, the aquaculture machine started to significantly reduce the aerator, which may move with the turtle up and down, neutralize the underlying oxygen performance, keep the entire pond water body It is related to more adequate dissolved oxygen. ?
5.4 According to trial and trial comparison, there are three points that polypodium and polypodium have polyculture. It is worth noting: (1) feeding time, food table should be staggered, should be fed turtle material, first feed fish, otherwise affect the fish to eat, especially It is a large-sized turtle that has a great influence on the fish's food intake; (2) After the fish is caught in the winter, due to the large size of the fish, the "buried pond phenomenon will affect the turtle's hibernation; (3) the fish's pectoral fins are hard, and Like "burial pond", it has brought certain difficulties to capture, how to improve the fishing method, making the operation more convenient is worth further exploration in the future.