Purple mussels seedlings schedule should be as soon as possible
Seedling time
Should be subject to different sea conditions. In the Yellow Sea area, spring shoots (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 height of the seedlings reaches 1.5 cm to 2 cm, they 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 as fast as possible, and the sooner the better, emphasizing no distinction between November seedlings. Of course, the Yellow Sea area can also use the wintering seedlings to divide the seedlings from April to May every year. The Bohai Sea adopts the method of splitting seedlings in spring and autumn.
Splitting method
At present, the method of sub-seedlings of mussels adopts the “clustering methodâ€, ie, the mussel seedlings, such as seedlings, ropes, etc., are taken into pieces or lumps and then divided into small pieces or blocks, each small piece or block. About 300 or so, and then clipped to the seedlings 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 The adjustment of the density is based on the actual amount of seedlings attached to the seedlings.
In addition, a “bag seedling method†is also used, in which the shellfish are packaged on the cultured seedling rope with a mesh sheet, and after the seedlings are firmly attached, the mesh sheet is removed again. This method is often used in scattered or incomplete films. The seedlings of the block are only used as an auxiliary seedling method because they are labor-intensive and time-consuming, and are used less frequently.
In the early stage of the culture of purple mussels, the density of the seedlings was 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.
Hanging water layer
The dead-floating (buoyancy is directly tied to the cormorant) cultured, the effective length of the sling (the length of the knot that removes the slings and the body and the ends of the seedlings) is 0.70 m to 1.00 m, and the floating buoyancy and buoyancy are used. Between two effective lengths), the effective length of the sling is 0.40 to 0.60 meters.
Number of hanging hanging ropes
Generally 180-200 hoists, the seedling rope can be single-hanged, double-hung, double-hung can be three-dimensional, increase the output of a single unit, reduce costs, improve efficiency, double-lift quantity depends on the depth of water and sea area productivity, generally can account About 20% of Taiwan's seedlings are hung.
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