The aquaculture environment requires that the environmental conditions for breeding be in compliance with the provisions of the People's Republic of China's international standard, "Environmental Requirements for Production Environment of Agricultural Products for Safety and Quality of Harmless Aquatic Products" (GB/T 18407.4-2001). In the cage culture area, the flow is unimpeded, and the flow velocity in the tank is preferably about 0.1 m/s, the transparency of seawater is more than 3 meters, and the water temperature is 10-27°C. Water temperatures below 9°C or above 28°C are detrimental to growth. The high temperature resistance of E. orientalis, E. orientalis and E. orientalis is slightly stronger, but water temperatures exceeding 30°C are prone to discomfort or unexplained death. Pond culture requires abundant water sources and clear water quality. It is better to have deep-water seawater or freshwater sources, which will be used to lower the temperature of pool water during the summer heat period. Industrial aquaculture water needs precipitation and sand filtration. Selection of cultured seedlings For the cultured seedlings, juvenile fish should be selected for their vivid color, strong physique, strong swimming ability, uniform size, no deformity and no trauma. Use small-sized fish species should choose full-length 5 cm, weighing about 3 grams of juvenile fish. Soak in fresh water for 5-10 minutes before stocking. Oriental cage culture 1), cage size and stocking density cage size and survival rate have a lot to do, small cages are prone to the phenomenon of residual food, should use round or square large cage as much as possible, commonly used cages The specifications are 3.0 meters 3.0 meters 5.0 meters, 6.0 meters 6.0 meters 6.0 meters, 8.0 meters 8.0 meters 8.0 meters and 10.0 meters 10.0 meters, 8.0 meters. Stocking densities were 10 to 15/m3 for juvenile and juvenile fish weighing 50 grams or less, and 6 to 9 fish/m3 for juveniles weighing 50 to 100 grams. From the juveniles to the 1st-instar fish stage, a polyethylene net cage was used, and a larger mesh net cage was continuously replaced with the growth of the fish (Table 2-3). When the total length of the fish body is more than 220 mm (above 300 g), it is transferred to a 4 cm mesh metal cage for breeding. The stocking density is controlled at 2-3 kg/m3 until it reaches the commercial fish size. Table 2-3 Relationship between fish size and mesh length Fry length (mm) 50 50-70 80-120 130-170 180-220 mesh length (mm) 5 10 15 20 30. 2) The bait and feed must be fresh, and it is forbidden to use spoilage food. In general, the quail shrimps and fish larvae are fed in the early stage of culture, and some artificial compound feeds are used in the middle and late stages, such as lagoon fish, Pacific salmon, sardines, and squid. Low-fat baits such as squid, shrimp, and oysters can be fed before harvest. Improve meat quality. Add 0.3 to 0.5% of complex vitamins to the bait regularly. The fish weighing 50 grams or less was fed 4 times a day; 50-100 grams were fed 3 times a day; the daily feeding rate was about 15% of the fish's body weight; the 100-200 grams were fed twice daily, and the daily feeding rate was: 12%-10%; more than 200 grams on a daily feeding, the daily bait rate of 10-3%; in the winter when the water temperature is low, it can be fed once every other day or every day. During the juvenile period, the first feeding of the first day is best started on the first day, so that the phenomenon of mutual-residue induced by hunger and feeding for a long time during the night can be reduced. 3), feed and feeding reference cage culture. 4) Water quality regulation for daily management of pollution-free culture: Change the water 1-2 times a week, and conditions can be used for running water culture to ensure that the water is fresh and avoid parasitic diseases or other diseases. The normal pool water color of oriental fish farms should be brownish yellow or yellowish green. The transparency of the pool water should be about 40 centimeters. The water color is dark brown or black, and it should be changed in time. The high water temperature during the summer can be changed during the second half of the night to the early morning, which will help reduce the water temperature of the pool. Xuntang: Check the fish ponds for 3-4 times a day. Observe the fish's activity, check the accumulated amount of residual baits and excreta at the bottom of the pool, and determine the physical and chemical factors such as water temperature and dissolved oxygen. , aquaculture ponds and stocking density cement pool area 80-100 m2 is appropriate, water depth 1.5-2.0 meters. With warming and inflatable equipment. Stocking density is controlled within 1 kg/m3. 2) Feeding and feeding reference cages. 3) The daily management of pollution-free breeding changes the water and sucks the dirt: change the water 1-2 times a day, changing the amount of water more than 50% each time. In the high water temperature period in summer, deep well water can be added to lower the water temperature of the pool water. Generally 30 minutes after feeding, immediately suck and change the water. Hygiene disinfection: disinfection of culture ponds and utensils before and after use, special tools for a variety of special pool; production operators should pay attention to hygiene, hand disinfection at any time, regular disinfection of the aquaculture plant channels. The wintering of the East? Normally, the Orientals need to breed for 2 years to reach the specifications of commercial fish, and the wintering in the coastal areas will encounter wintering problems. When the temperature of the sea area drops to 11°C, the fish must be moved into the greenhouse for the winter. The general water temperature can be controlled at 13-18 °C. The stocking density is preferably 2.0-3.0 kg/m3. The daily feeding rate is 3%-5% of the fish's body weight. Thoroughly clear the pool or pour the pool once every 1 month or so. Commodity Fish Harvest The commodity size of the Oriental is generally 300-500 grams or more. During the peak sales season and the consumption season, after the Spring Festival each year and before the Ching Ming Festival, the People's Republic of China should strictly follow the agricultural industry standard of the People's Republic of China for the use of pollution-free food and fishery drugs. The withdrawal date for the "Guideline" (NY5071-2002) stipulates that the drug should be stopped and the bait should be stopped for three days. Because the East is highly toxic. China has banned listing, and its products are mainly exported to Japan. Consumption of Oriental Yutun must strictly abide by the safe handling methods of Heyutun.
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