(1) Time of seedling separation: It depends on the conditions of different sea areas. In the Yellow Sea region, the Spring Shakes (manual seedlings or wild seedlings) are often used, so the seedling time depends on the individual size of the spring seedlings, as long as the shell seedling height reaches 1.5-2 centimeters when it can be divided into seedlings. The specific time starts from the middle and late August and ends before the end of October. In the meantime, the progress of seedlings should be faster and earlier, and emphasis should be placed on seedlings in November. Of course, the Yellow Sea can also use the wintering seedlings to divide the seedlings in the 4-5 months of each year. The mathematics area must be determined according to the conditions of icing and drifting in the sea area: There are a large number of sea areas with ice formation and drifting ice, and more methods for migrating overwintering seedlings are adopted. That is, the wintering season will be divided in the April-May period. The Miao ropes were transported back from the Yellow Sea area and directly bred to the breeding grounds. The Bohai Sea without heavy ice and ice flow was divided into spring and autumn seasons. In the South China Sea area of ​​Jiangsu, the Spring Festival of the local area or the north area is often used, so the sub-planting time is mostly in the autumn.
(2) Sub-seedling methods: Currently, the method of sub-seedlings of purple mussels adopts the “cluster clamping methodâ€, ie, the mussel seedlings at the nursery rope and the body are taken into pieces or lumps, and then divided into small pieces. Or, about 300 grains per piece or piece, and then clip it to the seedling rope at a certain distance. So that the seedlings will be automatically attached to the seedlings, and as the individuals gradually grow up to make small-scale movements, and constantly adjust the density between the seedlings covered with the entire seedling rope, at this time, but also artificially once Density adjustment, on the one hand to use a finger to the seedlings seedlings on the surface of the seedlings, on the other hand, according to the actual seedlings on the seedlings, more to go, make up less.
In addition, a “bag seedling method†is also used, in which net shells are used to wrap the shellfish on the cultured seedlings. After the seedlings are firmly attached, the meshes are removed. This method is often used in fragmented, unfinished or Because of the expense and time involved, the seed of the block is only used as an auxiliary seedling method and is no longer used in large quantities.
For transplanting overwintering seedling rope units, the shellfish seedlings on the purchased seedlings should be appropriately adjusted. For high density seedlings, the seedlings can be evenly caught and newly caught on new seedlings. It is supplemented with clips and cultured on low-density seedlings. This can make full use of materials and sea areas to achieve high yields.
(3) Mulberry seedling density: In the early stage of breeding of purple mussels, the density of the seedlings was too small, the individuals were large, and the yield was low. With the rise of the shrimp industry, a large number of mussels are used for shrimp bait, which has stimulated the vigorous development of the mussel farming industry. At the same time, there have been phenomena of large breeding density, small individuals, and high yield. These are not normal. Now everyone is unanimously pursuing not only large individuals, but also high output. Therefore, density is a key link. According to local experience, the density of seedlings per meter of seedlings is 1500-1800 grains, which means that every 15-20 cm clips a cluster of seedlings, and each cluster has about 300 seeds. A 2.5-meter-long seedling rope can clamp 12-15 families and 3600-4500 seedlings.
(4) Hanging seedling water layer: Take the depth of the uppermost point of the seedling rope from the surface of the water as the standard, generally 0.70-1.00 meters, adopt the dead-floating (buoyancy is directly tied on the corpse) to breed, the effective length of the sling (remove the sling and the sling The length of the knots at the ends of the body and the seedling rope is 0.70 to 1.00 m. It is raised by living floats (between buoyancy and the body with two effective lengths of 0.40-0.60 meters floating stern ropes). The effective length of the sling is 0.40. -0.60 meters.
(5) The number of hanging hanging seedling ropes: It is generally 180-200 hung. Miaosheng can be single-hanging or double-hanging. Double-hanging can be three-dimensional, increasing single-unit production, lowering costs, and improving efficiency. Double-lifting amount depends on the depth of water and the productivity of the sea area. Generally, it can account for about 20% of Taiwanese hanging ropes. .
(2) Sub-seedling methods: Currently, the method of sub-seedlings of purple mussels adopts the “cluster clamping methodâ€, ie, the mussel seedlings at the nursery rope and the body are taken into pieces or lumps, and then divided into small pieces. Or, about 300 grains per piece or piece, and then clip it to the seedling rope at a certain distance. So that the seedlings will be automatically attached to the seedlings, and as the individuals gradually grow up to make small-scale movements, and constantly adjust the density between the seedlings covered with the entire seedling rope, at this time, but also artificially once Density adjustment, on the one hand to use a finger to the seedlings seedlings on the surface of the seedlings, on the other hand, according to the actual seedlings on the seedlings, more to go, make up less.
In addition, a “bag seedling method†is also used, in which net shells are used to wrap the shellfish on the cultured seedlings. After the seedlings are firmly attached, the meshes are removed. This method is often used in fragmented, unfinished or Because of the expense and time involved, the seed of the block is only used as an auxiliary seedling method and is no longer used in large quantities.
For transplanting overwintering seedling rope units, the shellfish seedlings on the purchased seedlings should be appropriately adjusted. For high density seedlings, the seedlings can be evenly caught and newly caught on new seedlings. It is supplemented with clips and cultured on low-density seedlings. This can make full use of materials and sea areas to achieve high yields.
(3) Mulberry seedling density: In the early stage of breeding of purple mussels, the density of the seedlings was too small, the individuals were large, and the yield was low. With the rise of the shrimp industry, a large number of mussels are used for shrimp bait, which has stimulated the vigorous development of the mussel farming industry. At the same time, there have been phenomena of large breeding density, small individuals, and high yield. These are not normal. Now everyone is unanimously pursuing not only large individuals, but also high output. Therefore, density is a key link. According to local experience, the density of seedlings per meter of seedlings is 1500-1800 grains, which means that every 15-20 cm clips a cluster of seedlings, and each cluster has about 300 seeds. A 2.5-meter-long seedling rope can clamp 12-15 families and 3600-4500 seedlings.
(4) Hanging seedling water layer: Take the depth of the uppermost point of the seedling rope from the surface of the water as the standard, generally 0.70-1.00 meters, adopt the dead-floating (buoyancy is directly tied on the corpse) to breed, the effective length of the sling (remove the sling and the sling The length of the knots at the ends of the body and the seedling rope is 0.70 to 1.00 m. It is raised by living floats (between buoyancy and the body with two effective lengths of 0.40-0.60 meters floating stern ropes). The effective length of the sling is 0.40. -0.60 meters.
(5) The number of hanging hanging seedling ropes: It is generally 180-200 hung. Miaosheng can be single-hanging or double-hanging. Double-hanging can be three-dimensional, increasing single-unit production, lowering costs, and improving efficiency. Double-lifting amount depends on the depth of water and the productivity of the sea area. Generally, it can account for about 20% of Taiwanese hanging ropes. .
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