Barracuda is an important economic fish. It has wide temperature adaptability, low food requirements, fast production, low disease, easy aquaculture management, and high economic value. It is one of the major fishes in low salinity ponds and marine aquaculture in coastal areas. In recent years, in addition to the usual polyculture, there have also been many ponds for the cultivation of barracuda in the coastal area of ​​Zhejiang. The breeding conditions and technical points are described below. 1 Basic information 1.1 Pond conditions and supporting facilities 11.5 acres, rectangular, maximum water level 1.8m, sediment sludge 30cm thick, pH value 7.5, adequate water sources, no pollution, equipped with 2.2 kW diving One pump, 3 kW aerator, and other nets. 1.2 Sources of fish species The natural barracuda seedlings obtained from the sea have been cultivated in ponds for 7 months. The specification is 0.17kg per tail, which is a high-quality, large-size fish species that is disease-free and harmless. 2 Main Techniques 2.1 Fish Stocking In the first half of the month after the fish species were stocked, clear the pond with quick lime, and use 60kg/mu to kill harmful bacteria and other fish and shrimp, then fill the water to 1m deep, and stocking density is 1200 tail/mu, stocking size is 0.15kg/tail, and a total of 2090kg is stocked. 2.2 Feeding of the feed When the temperature of the water is good at the end of March, a small amount of cakes are fed and they are dropped every 2 to 3 days. Each feeding amount is 0.45 kg/mu. Feeding once a day starting on April 25th, feeding amount increased to 0.9kg/mu, and feeding time was 10:00am. In the beginning of May, silver ray special-purpose pellet feed (fast-growing feed) with better quality was gradually added. The amount has gradually increased, and the amount of feed is 8 kg/mu by May 25, and the amount of feed is increased or decreased according to the daily inspection of the food. Feeding twice a day until June 25th increased the feed intake to 14kg/mu. When the water quality deteriorates or the floating head of the fish is severe in the morning, do not feed the bait once in the morning and take appropriate measures. 2.3 Water Management One of the keys to breeding barracuda is to regulate water quality and prevent floating ponds. Water is added once a week, and the pool water is increased by more than 20cm. If the water quality becomes rich, remove the pool water and add new water so that the transparency of the pool water is maintained at more than 30cm, so that the water is yellowish green or yellowish brown, oil green and other good water colors, such as the old water of dark green, blue green, etc., must be large Change the water. Every day at 12 o'clock in the evening, the aerator is to be turned on and turned off after 8 o'clock in the morning. If the climate is poor and the water quality deteriorates, it is necessary to start the machine early. After the end of May, keep the water level at the highest level. 2.4 Fish Disease Prevention and treatment of barracuda Sex is easy to be scared. It is easy to be injured when playing water, starting up and other activities. Therefore, when walking around the pond and turning on the machine, the fish in the pool should be minimized, and the whole pond should be splashed with lime every half a month. The dosage is 15kg/mu to prevent the occurrence of bacterial diseases such as watery mildew and red skin disease. If there is a barracuda that has abnormal movement or death, diagnose it promptly and prescribe the right medicine. 2.5 The catching technology in recent years is the highest in June-August, so it is necessary to have a good income. It is better to use hot-water fish as the main product, and the price is 0.35-0.6kg/tail. highest. However, the mortality rate of the fish is relatively high in the summer. Therefore, the method of capture is also the key to economic efficiency. The non-rapid growth feeds, such as cakes, must be changed about 10 days before the arrest, and the feeding amount is slightly reduced. Stop food 1 to 2 days before catching, and exercise more than 3 times, but also control the time and speed of pulling the net. Generally, when the net is not floated in the morning, pull the net. The speed of pulling the net is slow for the first time. The barracuda jumps and stirs violently, otherwise it will bruise and bruise. When the net speed is officially pulled, the speed should be slow. When the area of ​​the remaining one-third of the pond is pulled down, it should be stopped for about half an hour. At the same time, the aerator must be opened. When the cage is raised, the pump must be used to flush the water with oxygen. This can reduce the barracuda. The death rate is generally over 90% when the scale is on the train. 2.6 Addition of fish species When the basic catch full size barracuda enough, immediately fill in the fish caught from the sea, the size of 3-6cm, the best time to stocking with a disinfectant to dip, to prevent Bacteria. The number of refills depends on the size of the large-size barracudas left. If only a small part of the original size is left, then about 2,000 taro/mu of barracudas can be added. 3 Results 3.1 In July-August, a total of 5 nets were captured and the total weight was 3511 kg. The total number of tails was 8165. The average size was 0. 43 kg/tail, and the revenue was 314,100 yuan. It has reached 1888.5kg of barracuda with an average specification of 0.51kg/tail and a return of 49,700 yuan. Large-scale species of fish 1785kg, a total of 11155 tail, specifications 0.16kg / tail, a total output of 7184.5kg, an average yield of 624.7kg per mu, a net yield of 427.6kg (including stocking fish weighing 182kg / mu, the film is 15. 1kg/mu), the survival rate of commercial fish is 86.1%, and the survival rate of fish species is 48.5%. 3.2 Economic Benefits The total income of the pond is 219,500 yuan (including temporarily retained fish species by 20 yuan/kg), the total cost is 80,000 yuan, and the net profit is 139,500 yuan, and the mu profit is 1.21. Ten thousand yuan. 4 Summary Discussion 4.1 Barracuda is the most profitable species in farmed fish in the area in recent years. It can obtain such a high mu gain, mainly because the price of live barracuda is more than several times that of other farmed fish. The aquaculture cost is similar to that of conventional fish culture, and the barracuda culture has fewer diseases, rapid growth, mixed food and a wide range of environmental adaptability, so it can obtain high yield and high efficiency. 4.2 The author believes that the main reason for high prices is that the market is in short supply. At present, there are certain restrictions on the cultivation of barracuda, which is mainly carried out using brackish water ponds and seawater ponds along the coasts of Ningbo and Shaoxing. The source of the seedlings is convenient and is obtained by natural fishing. For other aquaculture areas, the survival rate of long-distance transportation of seedlings is relatively low, and no units have been artificially propagated on a scale, so that the total output of barracudas will not be too large. 4.3 Specially cultivated barracuda is a new mode of cultivation in the eastern part of Cixi City in recent years, and more is the cultivation of barracuda in a polyculture. The advantage of polyculture is that it is not necessary to feed the barracuda exclusively. The disadvantage is that it cannot be used exclusively for catching hot-water fish from barracudas. It can only be caught at the end of the year. In addition, there is an increasing demand for water quality management. In particular, fish floating ponds should be carefully guarded. Its stocking density is generally 300/mu. 4.4 During the breeding process, there were several floating ponds and dead fish. The main reason was that the water quality was too fat, the transparency was only 25cm, and it would be thunderstorms in continuous cloudy days or evenings. Even if the aerator was started at 10 o'clock that night, it would be difficult to satisfy. The dissolved oxygen requirement of fish. Therefore, in the breeding process, we must strictly control the water quality in the pool and cannot make it over-fertilized. Once the fat is too large, a large water change must be performed. At the same time, a 10-15 mu fishpond requires the installation of two 3 kW aerobics. Machine, in case of accidents. The stocking density should not be too large. It is recommended that 900-1200 tails/mu be appropriate. 4.5 The product specifications for cultivating fish must be well controlled. At present, the most popular market is 0.35-0.6kg/tail. Prices that are too big or too small will obviously decrease. Therefore, in the culture process must be regularly checked, estimated to be fed a fast-growing feed is too small, the reaction is less feeding or feeding crude fiber high feed to slow its growth rate.
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