Yellow Croaker,Frozen Yellow Croaker,Yellow Croaker Fish Dingshengyuan Trade Co., Ltd. , http://www.fj-foods.com
“The three bamboo shoots of the Waiwaihua, the prophet of the Spring Plumbing Duck. The short shoots of Artemisia halodendron are the river Fish yuzu.†This is a poem written by the great poet Su Shi of the Song Dynasty on Heyutun in the year of Shenzong Yuanfeng. From this we can feel the "cultural atmosphere" of Heyutun. River Fish Village is a peculiar fish that people are both familiar with and unfamiliar with. River Fish Village is delicious in meat, fresh in texture, rich in nutrition, suitable for raw and cooked foods, and has a sashimi color, aroma, taste, and a good shape. It makes food lovers ecstasy and Heyutun can be made to have a unique flavor. All kinds of dried products have always been deeply loved by our people. However, due to the recession of fishery resources, natural river fish fisheries have been caught less, resulting in a balance between supply and demand in the market. In order to make up for this shortcoming and satisfy consumer demand, aquaculture experts began artificial breeding of river fish and achieved positive results. Artificial breeding and breeding have significant economic benefits. The main cultured species in China is the Red Fin Oriental Yutun. The adult fish breeding methods of the Redfin Oriental Fish Farm mainly include ponds, cages and factory culture. Now briefly introduce the main breeding techniques in the first two ways. 1. Cultivation facilities conditions and stocking densities (1) Pond farming methods Ponds can use shrimp ponds, with an area of ​​1 mu to 5 mu, and a depth of 2 to 2 . 5 meters, with good drainage system and escape prevention facilities. . One week before stocking, clear the pond with lime or bleach. The amount of quicklime is 100kg to 150kg per mu, and the dosage of bleach is 30mg/L to 40mg/L. One week later, inflow of water, application of basic fertilizer, breeding of basic biological food. The stocking density is to be diluted. Fish species of 50g to 100g can be stocked from 100 to 1500 mu per mu. (2) The aquaculture area selected for cage culture must have a fresh water quality, no direct impact of typhoon, no occurrence of red tide, no large amount of freshwater injection, no pollution. Transparency is best to be more than 2 meters. In a sea area with low transparency, the lack of fish consumption will lead to mutual food and cause high mortality. The water flow rate is preferably 0.1 m/s. The water temperature is ideal in the range of 10°C to 27°C throughout the year, and the optimal temperature period of 16°C to 23°C is the best in the sea area. The size of the culture cage is closely related to the survival rate. Small cages can appear as a result of foodstuffs. Round and square cages should be used as much as possible. If the size of the fish is within the range of 50 to 100 grams and the size of the cage is 6 to 6 meters and 6 meters, 8 to 8 meters and 8 meters and 10 to 10 meters and 10 meters, the amount of cages placed is 1300 to 1800 tails, 2,500 tails to 3,500 tails, 5,000 tails to 7,000 tails, and stocking tails of 6 tails/m3 to 9 tails/m3. If small cage culture is used, the stocking density should be appropriately reduced. At the same time, it should be noted that as the length of the fish grows, the mesh of the cage should also gradually increase. The relationship between fish size and mesh is the full length (cm) of the fish: 5, 5-7, 8-12, From 13 to 17 and 18 to 22 hours, the mesh length (mm) is 5, 10, 15, 20, 30; when the fish body is more than 22 centimeters long, the mesh is 40 millimeters. In order to prevent river fish tussions from escaping through the cage, when the fish is 22 centimeters long, it should be moved into a 40-mm mesh metal cage for breeding. The amount of stocking should be controlled between 2 kg/m3 and 3 kg/m3. . Has been stocked to the product specifications. It is also possible to use metal meshes at the beginning of stocking, so that there is no need to change the net during the breeding process. (2) Breeding techniques and management points (1) Seeds of seedlings should be selected to be healthy and uniform in size. The seedlings can be inflated continuously during transportation, and the water temperature can be maintained at 10°C. The transportation time should not exceed 20 hours. The seedling must be drenched once before the lower pond. The medicine is furan styrene sodium, and the dosage is 50g-100g per ton of seawater. The medicinal bath can be carried during transportation. After the medicinal bath, stocking is carried out. (2) The bait feed must be fresh. At different stages of farming, the feeds fed are also different. In the early stage of breeding, small miscellaneous fish are generally fed, and sardines, mackerel, horse mackerel and artificial diets are mainly fed in the middle and later stages of breeding. Before harvesting, low-fat diets such as Squid, shrimp, and oysters can be fed to reduce the content of artificially-combined dietary fat to improve the quality of the fish at harvest. Red Fins Oriental Fish Farm has a large demand for vitamins, and vitamin deficiency diseases are easy to appear in the culture. Therefore, vitamin B and vitamin E should be added in an appropriate amount. Insufficient food will cause fish to eat each other, affecting the survival rate and appearance quality of finished fish. Therefore, it is an important part of aquaculture management to feed palatability foods to ensure that the number of feeds and the amount of bait to be fed. 1 Feeding frequency 0-10 grams of Heyutun, feeding 3 times to 4 times a day; feeding 100 grams to 200 grams 2 times to 3 times a day; 200 grams a day, feeding 1 time to 2 times a day . 2 Feeding rate Determine the daily feeding rate according to the weight of different fish. 3 Feeding time In the juvenile period, the earlier the time of the first feeding in the morning, the less the fish can eat each other. Therefore, the first feeding should be completed before 8:00 am and the last one should be It takes 2 hours to 3 hours at sunset. The amount fed is based on the degree of satiety of the fish. When the fish swims back and forth, they must feed a few times; when the fish sinks to the bottom of the pond or cage, they can stop feeding. 4 feeding methods are mainly hand-sprinkling, automatic feeding bait feeding, network leakage or hanging type. (3) Water quality Fresh fish in the red fin Dongfangyutun will be fresh and refreshing. During pond cultivation, the water should be changed once or twice a week according to the water color, water quality, transparency, dissolved oxygen and fish activity. Water, maintain a transparency of about 50 cm, keep enough oxygen and microbial feed. (4) The daily management of aquaculture management is directly related to the success or failure of breeding. Under normal circumstances, the Oriental Red Fin Tuna can reach commercial specifications after a period of one and a half to two years, and the survival rate is generally 30% to 50%. During the aquaculture process, the status of the fish body, the activity of the fish, and the breeding diary must be observed every day. The numbers of rearing fish, the size of the fish, and the number of dead tails should be recorded. (5) common diseases and prevention methods 1 Muscular atrophy often occurs in the juvenile stage, the diet is not suitable or lack of vitamin E is easy to produce this disease. Symptoms of fish body color blackish thin, poor ability to adapt to the environment, the treatment to avoid feeding high fat foods, while feeding added vitamin E compound feed. 2 Trichodinosis is caused by parasitic worms. Symptoms of excessive mucus on the body surface and sputum can be diagnosed with a microscope. Treatments typically use methylene blue and formalin solution medicated baths. Methylene blue 2 ppm, formalin 0.5 ppm, medicinal bath for 30 minutes to 45 minutes. When the medicine bath is covered with a plastic cloth in the cage, adjust the medicine and then fish it. The medicine bath is for 30 minutes to 45 minutes. The medicine bath should be oxygenated to prevent the fish from lacking oxygen. 3 The cause of green liver disease is lack of nutrition. The fish's belly is slightly red and the liver is green. Vitamin E can be fed. 4 Yellow grease Due to the long-term feeding of Frozen Fish with high fat content and poor freshness, the bait fat is oxidized and toxic. Diseased fish swimming slowly, black or gray body color, markings are not clear, the liver was yellow-brown, intra-abdominal fat layer produces yellow, slightly hard block. Change the fresh feed and change the type of food on a regular basis, and add vitamin E to reduce the symptoms.