The fish (Elopichthys bambusa Richardson) is a member of the family Acipenseridae. Living in the middle and upper levels of rivers and lakes, swimming quickly and acting with agility is a typical fierce fish that mainly feeds on fish, and it is also a large freshwater economic fish. The fish is fast growing, has a large individual, and has a delicious meat taste. It has always been regarded as a high-grade freshwater fish. In recent years, due to the construction of water conservancy projects in mountain areas and the deteriorating water environment, the natural resources of fish have been drastically reduced. At present, most of the fish are caught except for the Yangtze River and lakes directly connected to the Yangtze River. Rivers and lakes are hard to find and trace fish. In 2003, we conducted a pond culture experiment for fish, and succeeded in developing a commercial fish with an average weight of 600 g/tail and a maximum of 1.5 kg/tail in a fish species of about 3 cm in the current year, and the survival rate was over 90%. . The relevant technologies are summarized below. 1. The requirements for the pond area are between 2 and 10 mu. The water depth is between 1.5 and 2m. Tanggu is solid and does not leak water. It is convenient for drainage and irrigation. The silt thickness at the bottom of the pond does not exceed 20 cm. 2. Stocking mode and density 2.1 Pond special culture: mainly fish culture. In order to regulate water quality, a small amount of maggots and squid can be raised per mu. Stocking density depends on pond conditions and management levels. Usually about 3 cm per acre can be stocked with 800 fish species, 50g/tail carp and carp one-year old fish species around 50. 2.2 Polyculture of crabs and crabs: Properly adopting crabs in the fishponds can ingest some of the feed (fish) that has not been eaten and that sinks into the bottom of the fish. This allows the crabs to serve as “scavengersâ€. It can not only reduce the deterioration of water quality caused by residual feeding rot, but also increase the breeding efficiency. Generally about 3 cm per acre can be stocked with 600-800 tail fish species, and the stocking numbers of cockroaches and mackerel are the same as those for “special careâ€, with a specification of 120-200/kg per acre. Crab species 100--150 or so. At the same time, it is appropriate to store water peanuts on the surface of ponds, plant aquatic plants (grass grass or black-leaf algae) at the bottom of the pond. 3. Feed and Feeding Methods Fish are ferocious fish that feed on live fish in natural waters. However, in the artificial breeding, if feeding live bait, the first is the high cost of breeding, the second is the need to be equipped with a special pond for feed fish, and to do the palatability of feed fish, more troublesome. Tests have shown that the fish are domesticated and their food performance changes from eating exclusively live fish to eating dead fish (fish). Therefore, the fish feed can be used live fish fry in the early stage and fish in the later stage. The domestication of fish can be started from about 5 cm in length. Before the 5 cm body length, suitable live fry should be fed. 3.1 Preparation of live feed: The live fish required for the early period of the fish can use the “Four Home Fish†fry. There are two ways to prepare and feed live bait. The first is to cultivate directly in fish culture ponds. Two-and-a-half to twenty-thousand-thousand-thousand-thirty-nine fish ponds were reared in each pond in the first half of the month. The fish was cultivated according to the requirements for the cultivation of summer flower species. When the fry grows up to 1.5 cm, 3 cm of fingerlings are directly placed in the pond to feed on the fry. Ponds should continue to feed the powdered feed and cultivate feed fish so that the feed fish and the fish can grow “synchronously†to ensure that the fish have palatable baits at any time. When the fish grows to about 5 cm and the live bait in the pond cannot meet the demand, the domestication of food habits is started and the appropriate fish is fed. The second is to use a pond to cultivate live feed. In aquaculture ponds, a holding area of ​​about 10% of the total area of ​​the pond is surrounded by a mesh sheet. About 3 cm of fingerlings of fish are put into the pond. The live fry is fed first, and then the mixed fry and fry are fed. Finally, the fish was completely fed to complete the conversion of food, and the seine net was removed. Compared with the two methods, the former is more convenient for the first time, but the domestication is relatively difficult, and the latter is the opposite. 3.2 Domestication: Select a pond with less silt on the bottom of the pool and face the sun toward the south as a food farm. Domestication should be carried out twice a day, at 9 am and 4 pm. During domestication, water is splashed into the food field, and feeding is started a few minutes later. Watering and feeding are repeated, so that the fish circulates back and forth so that the fish form a conditioned reflex. If water is poured into the food field, it will quickly converge on the food field. At the beginning, the best bait is a mix of live fish fry and small fish made of small fish or fish, and then it will transition to all fish. 3.3 Feeding: After completing the conversion of diet, fish should be fed regularly, fixed-point and quantitatively. Normally, every time in the afternoon, the fish should be splashed with water before feeding. After the fish are gathered in the food field, they are fed again. steak. The amount of feeding depends on the weather, water temperature and the fish's feeding conditions. Generally, the daily feeding amount is 5%--8% of the fish's body weight. For example, frozen fish fillets should be supplemented with fresh fish at regular intervals, or multivitamins and vitamin C should be added to frozen fish fillets. 4. Daily management 4.1 Strengthen water quality regulation: The daily management method in fish culture is basically the same as other fish culture. In the breeding, we should pay attention to the control of water quality, keep the water fresh and rich in dissolved oxygen, and the transparency should be controlled at more than 30cm. In the early stage, water injection is the main method, and water can be added every two weeks to make the pool water deepen as the fish body increases. In the middle and late period, the water should be changed in time, and quicklime should be thrown into the pool regularly. Compound biological agents can also be applied to improve the water quality. The hot weather should be increased in time to prevent oxygen-deficient floating heads. 4.2 Timely stocking: The fish rush to eat fierce, large food, fast growth, but the individual differences. Therefore, if the breeding is not carried out in time in the culture, it will cause the big fish to eat hard, eat much more, grow faster, and the fish will not eat food and grow slower. At the same time, there will also be a phenomenon that “the fish cannot be eaten in big fish, and small fish can’t eat enoughâ€. Ultimately, the difference between the weight of Tong Tong's culture exceeded 10 times. Therefore, in the breeding process should be based on the growth situation, timely division of support. 4.3 Disease Prevention and Control: The pond fish culture of freshwater fish has just started and no specific diseases have been found. However, the prevention of diseases should be paid attention to in the breeding process. The first is that the aquaculture pond is sprinkled with 75-100 tons of quicklime per acre before use to improve the sediment quality of the pond and kill bacteria. The second is to use salt water for soaking disinfection before the fish ponds. Third, the feed fish should be safe and sanitary, meet the relevant requirements, and regularly disinfect the food field with bleaching powder or strong chlorine. 5. Discussion The success of fish pond aquaculture depends on whether the fish can be eaten live baits or eat fish or dead fish. Domestication time, that is to say, the fish began to acclimate when it grows to a large scale, which has a great influence on the success or failure of domestication and the survival rate of culture. This experiment adopts live bait to feed the fish to 5 cm before domestication. We think it is more appropriate because the live fish in the natural waters feed on live fish to make them eat fish or dead fish. There must be one. In the “forced†process, the fish were forced to change their food to fish only after they were hungry to a certain extent. Premature acclimatization may affect the survival rate due to the small size of individual fish and their weaker constitution. The domestication was too late, which made it difficult to prepare the large amount of live feed fish in the early stage. The test also showed that the start of domestication around 5 cm in the fish, generally can complete the food conversion in a week, and the survival rate can reach more than 90%. About feeding feed. In this experiment, through the domestication of the fish, the fish was used as feed to develop the product specifications for the fish that year. In the future, it is necessary to study the technology of cultivating fish in pellet feed.
Soy Protein,Protein Powder,Protein Concentrate
fish meal,corn gluten meal ,meat and bone meal Co., Ltd. , http://www.nsmeal.com