Setting of cage for cage culture of Pelteobagrus fulvidraco

1. The cage frame is the material such as bamboo and wood that supports the cage, which is composed of box frame and buoy. Most of them are made of coarse bamboo, Chinese fir and waste oil barrels, as well as steel (angle steel). Generally speaking, the side length of the box rack should be greater than the side length of the cage, and the distance between the boxes should be 2-3 meters.

two。 The cage layout mostly adopts the "one" zigzag single-row structure, with every 4 boxes as a group, or the "non -" zigzag double-row structure with trestles in the middle and cages on both sides. Each 4-or 8-carton is a group, bound with wire and assembled in groups.

3. There are two types of cage types: floating type and fixed type, namely, open floating type and closed floating type, open fixed type and closed fixed type. At present, the open floating cage is the most widely used. When the degree of intensification is high, the open cage can be used in the fry box and the closed cage can be used in the adult box. Cages of suitable specifications should be selected according to local conditions and placed in waters with a flow rate of 0.05 to 0.2 m / s according to local characteristics. For open floating cages, an escape net must be added around the frame. The open fixed part of the water should be about 0.8 above the water surface to prevent escaping fish. The placement of all cages should be firmly formed. Generally speaking, in order to increase the insurance coefficient, double-layer cages can be set up.

For newly developed waters, the arrangement of cages should not be too dense. In the more open waters, the arrangement of cages can be arranged not only in "one" shape and "non" shape, but also in "product" shape, "plum blossom" shape or "human" shape. The distance between the cages should be kept at 3mm. There are 5 cages in each group, and the distance between the two groups is about 5 meters, in order to avoid mutual influence. For some waters dominated by flood storage and discharge, it is appropriate for cages to be arranged in the whole row and row, so as not to affect the flow rate and discharge of flood discharge.

4. Trestle bridge is a channel for operators to walk and operate in cages and cages, which is generally slightly longer than the length of each set of boxes, with a width of 0.6 to 1 meter. The channel of the "non" zigzag cloth box is arranged between two rows of shelves. The passageway of the "one" shaped cage is located on the nearshore side of the box frame to facilitate the operation in management. The total buoyancy of each group of channels shall not be less than 200 kg. The channel can be made of 2-3 layers of bamboo bundled side by side, or by electric welding of steel.

In order to facilitate the feeding and management work and the assembly and disassembly of the box, the joint of the cage, box rack and passageway (including the water duty room) should have a certain connection. The spacing of the box rack should usually be more than 5 meters, and the row spacing should be more than 50 meters. The positioning of the box frame on the water can adopt the methods of piling and pulling rope on the opposite bank, anchoring under water and so on. It should be noted that the spare length at the end of the tethered net should be kept in line with the annual rise and fall of the water level. After the positioning of the box frame and the net frame, the cage should be launched and put on the shelf 7-10 days before stocking, and the outlet part of the open cage should be 0.4-1m. The bottom of the cage can be suspended to keep the box in normal shape.