First, the mesh size of the cage culture cages are 15 mm, 20 mm, 35 mm and 50 mm, respectively; the cage specifications are 3.5 m 2.5 m 1.5 m, 3.5 m 2.5 m 2.5 m, 3.5 m 2.5 m 3.5 m And 3.5 meters 2.5 meters 5 meters. The 15mm mesh is a knotless machined mesh piece processed; the 20mm mesh is a machined knotted mesh piece processed with 12 wires; the 35mm mesh is a knotted artificial mesh, and the mesh line is 24 wire; 50 mm mesh is a knotted artificial mesh, with 45 wires. The first three mesh specifications apply to juveniles up to 4 kg in weight, and the latter specification applies to juveniles and broodstock in excess of 4 kg. Juveniles are cultured from a total length of 50 mm to 70 mm to 90 mm to 120 mm using a 15 mm net cage; 90 mm to 1200 mm in length to 210 mm to 230 mm, using a 20 mm mesh; Above 35 mm, 35 mm mesh can be used; when it is longer than 460 mm, 50 mm mesh is used.
II. Stocking specifications and density The stocking specifications and densities of the cage fish cultured in the boxfish culture are closely related to the survival rate of the culture. The survival rate for stocking 20 mm to 30 mm in length is only 35%, while the survival rate for stocking 40 mm to 50 mm in length is only 75%, while the survival rate for stocking for 70 mm to 110 mm in length is only 91%. The survival rate of 90 mm to 120 mm was only 93.4%. The density of stocking is related to the speed of individual development. Juvenile fish stocking density of 40 mm to 50 mm for the 20 to 33 tails / m3, the optimal density of 25 / m3 to 28 / m3. The stocking density of juveniles from 90 mm to 120 mm is 20 to 25/m3. Under normal circumstances, juvenile fish every 15 days to 20 days to adjust the stocking density and according to the size of the fishnet mesh box mesh specifications, when the total length of more than 210 mm, according to the different size of the fish body culture.
Third, feed and feeding methods Quercus fulvidraco feed types are juvenile fodder, blue round ginseng, golden small sardines, dog mother fish, tail fish and bamboo fish. Juveniles feeding from 20 mm to 30 mm in length are required to remove scales, bones, and thorns first, and then use a meat grinder with a 2 mm hole to grind the ground meat, mix with young quail feed, feed once every 2 days, and feed daily. It is 16% to 20% of body weight. When the juveniles are 40 mm to 50 mm in length, the type of feed is the same, but the meat grinder's aperture is changed to 5 mm, and feeding is performed every 2 days. When juveniles are 70 mm to 120 mm in length, they are not processed with scales, bones, and thorns before processing, but are still processed with a 5-mm hole grinder. The number of feeds is changed to 6 am, 10 am, 3 pm, and evening At 6 o'clock each time, the dosage is 16% to 18% of body weight. When the total body length of the fish reached 170 mm, it was processed with a 15-mm hole grinder, and the number of feedings was changed to early and late ones. The feeding amount was 12% to 16% of body weight. When the total body length of the fish reaches 230 mm, it is fed into a block or entire small fish and shrimp, and each feeding is performed once in the morning and evening. The feeding amount is 7% to 10% of the body weight.
4. Individuals of different sizes and sizes should be cultured in separate nets. Individuals with a total length of 40 mm to 50 mm in the juvenile stage should not be polycultured with individuals over 150 mm; individuals with a total length of 100 mm cannot be polycultured with individuals above 200 mm. In the case of hunger, the phenomenon of large fish eating small fish and tail biting occurs from time to time. In order to improve the survival rate and aquaculture production of aquaculture, a graded culture method must be adopted. From the juvenile rearing to a total length of 420 mm and a body weight of 1.15 kg, the culture time was 189 days. The first-level stockings are 40 mm to 70 mm in length, the second-level stockings are 150 mm to 200 mm in length, and the third-level stockings are more than 230 mm in length.
Fifth, the daily management of the fine network The purpose of changing the network time interval of the cage is within 10 days, and the interval of the replacement of the coarse network is within 30 days. From April to November, fouling organisms such as shellfish, sea squirts, coelenterates and barnacles are easily attached to the mesh. Failure to change the mesh in time can lead to blockage of the mesh and increase in sediments on the bottom of the mesh, causing cage load. Too heavy and sinking, or breaking the net to escape the fish.
II. Stocking specifications and density The stocking specifications and densities of the cage fish cultured in the boxfish culture are closely related to the survival rate of the culture. The survival rate for stocking 20 mm to 30 mm in length is only 35%, while the survival rate for stocking 40 mm to 50 mm in length is only 75%, while the survival rate for stocking for 70 mm to 110 mm in length is only 91%. The survival rate of 90 mm to 120 mm was only 93.4%. The density of stocking is related to the speed of individual development. Juvenile fish stocking density of 40 mm to 50 mm for the 20 to 33 tails / m3, the optimal density of 25 / m3 to 28 / m3. The stocking density of juveniles from 90 mm to 120 mm is 20 to 25/m3. Under normal circumstances, juvenile fish every 15 days to 20 days to adjust the stocking density and according to the size of the fishnet mesh box mesh specifications, when the total length of more than 210 mm, according to the different size of the fish body culture.
Third, feed and feeding methods Quercus fulvidraco feed types are juvenile fodder, blue round ginseng, golden small sardines, dog mother fish, tail fish and bamboo fish. Juveniles feeding from 20 mm to 30 mm in length are required to remove scales, bones, and thorns first, and then use a meat grinder with a 2 mm hole to grind the ground meat, mix with young quail feed, feed once every 2 days, and feed daily. It is 16% to 20% of body weight. When the juveniles are 40 mm to 50 mm in length, the type of feed is the same, but the meat grinder's aperture is changed to 5 mm, and feeding is performed every 2 days. When juveniles are 70 mm to 120 mm in length, they are not processed with scales, bones, and thorns before processing, but are still processed with a 5-mm hole grinder. The number of feeds is changed to 6 am, 10 am, 3 pm, and evening At 6 o'clock each time, the dosage is 16% to 18% of body weight. When the total body length of the fish reached 170 mm, it was processed with a 15-mm hole grinder, and the number of feedings was changed to early and late ones. The feeding amount was 12% to 16% of body weight. When the total body length of the fish reaches 230 mm, it is fed into a block or entire small fish and shrimp, and each feeding is performed once in the morning and evening. The feeding amount is 7% to 10% of the body weight.
4. Individuals of different sizes and sizes should be cultured in separate nets. Individuals with a total length of 40 mm to 50 mm in the juvenile stage should not be polycultured with individuals over 150 mm; individuals with a total length of 100 mm cannot be polycultured with individuals above 200 mm. In the case of hunger, the phenomenon of large fish eating small fish and tail biting occurs from time to time. In order to improve the survival rate and aquaculture production of aquaculture, a graded culture method must be adopted. From the juvenile rearing to a total length of 420 mm and a body weight of 1.15 kg, the culture time was 189 days. The first-level stockings are 40 mm to 70 mm in length, the second-level stockings are 150 mm to 200 mm in length, and the third-level stockings are more than 230 mm in length.
Fifth, the daily management of the fine network The purpose of changing the network time interval of the cage is within 10 days, and the interval of the replacement of the coarse network is within 30 days. From April to November, fouling organisms such as shellfish, sea squirts, coelenterates and barnacles are easily attached to the mesh. Failure to change the mesh in time can lead to blockage of the mesh and increase in sediments on the bottom of the mesh, causing cage load. Too heavy and sinking, or breaking the net to escape the fish.
Agrochemical Adjuvant,Stabilizing Agent,Stabilizing Surfactant Adjuvant,Agricultural Additive Agent
Jiangxi Tiansheng New Materials Co.,Ltd , http://www.jxtsxcl.com