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PDGFR Inhibitor Sorafenib Tosylate, Sunitinib Malate, Multikinase Inhibitor, Imatinib Inhibitor Taizhou Crene Biotechnology Co., Ltd. , http://www.crenelab.com 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 fish breeding experiment and succeeded in developing a commercial fish with an average weight of 600g/tail and a maximum size of 1.5kg/tail for a 3cm summer fish species. The survival rate was 90% or more. The relevant technologies are summarized below.
1. The pond requires that the pond area can be between 2 and 10 mu, and the water depth is 1.5 to 2m. The pond dredge is solid and does not leak water, and drainage and irrigation are convenient. The thickness of sludge at the bottom of the pond does not exceed 20 cm.
2. Stocking mode and density
2.1 The pond is cultured exclusively with fish culture. In order to regulate the water quality, a small amount of alfalfa and squid can be bred per mu. Stocking density depends on pond conditions and management levels. Generally about 3 cm per acre can be stocked with 800 fish and 800 fish, 50g/tail of carp and carp with about 50 fish.
2.2 Properly rearing crabs in a fish pond in a polyculture of fish and crabs. Some feed (fish) that has not been eaten and that sinks to the bottom of the fish can be ingested by crabs and allowed to serve as a “scavenger.†It can reduce the deterioration of water quality caused by residual feed rot and increase the breeding efficiency. Generally about 3 cm per acre can be stocked with 600-800 tail fish, and the stocking amount of cockroaches and sturgeon is the same as that of “special careâ€, and a 1-year-old crab with a specification of 120-200/kg per acre is released. 100 to 150 or so species. 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 is a ferocious fish that feeds 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 start from about 5 cm in length. Before 5 cm in length, live fish fry should be fed.
3.1 Preparation of live feed
The live fish required for the early period of the fish can be used as 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. In the first half of the month before the fish pond, stocking of 1 to 200,000 domestic fish ponds per acre of ponds was cultivated according to the requirements for the cultivation of summer flower species. When the fry grows to 1.5 centimeters, 3 centimeters of fish will be directly placed into 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 centimeters, and live baits in the pond are no longer able to meet the demand, they begin domestication of food habits and feed puffy fish. Second, they use special ponds to cultivate live feed. In aquaculture ponds, use a mesh to form a holding area of ​​about 10% of the total area of ​​the pond, and put about 3 cm of fish fingerlings. First, feed live fish fry, and then feed the fry and fish. 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 ponds with less silt on the bottom of the pool and face the pond towards the south as a food farm. Domestication takes place twice a day, at 9 a.m. and 4 p.m. 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 After feeding, the fish should be fed regularly, fixed-point and quantitatively. Usually in the afternoon and once 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. Piece. The amount of feeding depends on the weather, water temperature, and fish eating conditions. Generally, the daily feeding amount is 5% to 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 methods in fish farming are basically the same as those in Other fish cultures. 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 division
The fish are ferocious, have a large amount of food, and grow fast, but individuals vary widely. 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 Yang Yun and the result is more than 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 culture of fish has just begun and no specific disease has been found. However, the prevention of diseases should be paid attention to in the breeding process. The first is that the aquaculture ponds are sprinkled with 75 to 100 Kg of quicklime per acre before use to improve the sediment quality of the ponds and kill germs. 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 key to successful fish aquaculture is whether it can be domesticated from eating live bait to 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 centimeters before domestication. We think it is more appropriate because the fish in the natural waters feed on live fish, making 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 experiment also showed that when the fish began to domesticate around 5 centimeters, the dietary transformation can generally be completed in one 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.