A cage, making

1, the size and shape of the cage

The plane shape cage rectangle, square, polygon, circle etc, with rectangular and square is the most common. Cage size can be divided into three categories: large cage, area 60m2 ~ l00m2; medium-sized cage, the area of 30 square meters around the; small cage, the area below the l5m2

2, the height of the cage

Cage feeding planktivores, wall net height should be based on the depth of the vertical distribution of plankton, water determination. General in the reservoir of the height of the wall to take 4m ~ 2m, the lake to take l.5m ~ 2.0m, shallow water to take 35m is appropriate. Open the cage wall net should be higher than the fish surface 1750px.

3, mesh size

In order to save the material, the water exchange rate of the tank is high. For example: cage culture of silver carp and Bighead fry, bred summer flower cage material should polyethylene mesh with 100 mesh /m2.

Two and cage assembly

Generally used to wear, around, and three ways to sew. If a covered rectangular cage, there are three kinds of sewing method:

(L) with six mesh and seam molding;

(2) all the two sides of the wall mesh are combined into a net, and the bottom and the top cover are four mesh and sewn together;

(3) the wall net around the net is a net, and the bottom net and the cover net are formed by three pieces of net. Below to 8m * 4m * 2m closed soft floating fish cage, for example, the assembly method is as follows: mesh by 0.21/l x 3 polyethylene line manual weaving, single fixed knot, 10 mm. First woven into six nets, two long side of the wall mesh for the l334 mesh 250 mesh, two short side wall mesh for 667 mesh * 250 mesh, cover network for 1334 mesh * 667 mesh, the end of the mesh L600 mesh 800 mesh. First 0.2l/6 x 3 polyethylene line according to the design length, and the two ends of the 1250px as wearing a gang, six pieces of mesh edges by item string. Then use 0.2l/8 * 3 polyethylene line as a gang, the wall of the network, the edge of the cover network, along with the gang and the gang ligation. When the ligation is used, the 0.2l/6 * 3 polyethylene thread is used to sew the adjacent two threads, and every 500px is L. At the bottom of the wall mesh and the mesh of the bottom mesh through the five mesh to six mesh to wear around the connection, segmented ligation. In the cover line to open a feeding mouth, or in a corner of the two sides of the left for a long period of 1.0 ~ 1.5m active network as the mouth feeding, fish and fish, 0.2l/9 x 3 polyethylene line as the corkline, wearing a tie 250px diameter ~ 300px foam float, interval l0 ~ 375px, then and wall online classes and synthetic; in every online LM cover ~ 2m ligation of a diameter 250px foam float, arranged in rows, spacing 2.0m to 2.5m. In the wall under the net Gang Department of porcelain sinker, each sinker weight 50g, every 1250px ligation 1.

Three, in set mode

Cage in water settings should be considered depending on water conditions, cultivating object, operation management and economic benefits. Is appropriate or not, affect the yield of fish cage. Set mode it is necessary to consider the management of convenient, the cage is relatively concentrated in a region, but also to maintain certain distance, does not affect the water flow exchange and the growth of the fish. Cage arrangement should be as far as possible to make each cage facing in the direction of flow, the general was "font" or "plum blossom" and the staggered position exchange with the water inside and outside of the box.

In setting the following categories:

L, floating type

Its characteristic is the cage and can automatically lift according to the water level, the cage volume is not due to water level changes. The floating cage can be divided into closed frame, closed soft floating, open frame etc.. Floating type single box single anchor (or double anchor) fixed method and two kinds of series fixed method. The cage single anchor can be fixed with the water level, wind direction, direction change and automatic drifting and turning, but the wind resistance is small. The series is composed of a plurality of fixation cage (generally 4 ~ 6) at a certain pitch series in a row, anchored at both ends. The cage distance is 3M ~ l0m, and the distance between should be more than 50m.

2, fixed type

The cage is fixed around the pile, with iron or pulley usually in the pile, and the cage four angle connection. Adjusting hoop position pulley or the length of the rope, the cage can be subsequently lift, but generally box is not varied with the change of water level and movements, but the box into the depth of the water change, most spacious for rivers in water levels are relatively stable in shallow lakes and reservoir area, with low cost, simple operation, convenient management, strong wind resistance and other characteristics.

3, sink type

Throughout the cage all submerged in water, the water level change does not affect the cage of the effective volume, netting attached less bio. The disadvantage is that the feeding and operation management inconvenience. In the northern area of our country for larval or adult overwintering.

Four. Optimization of water body

Maintain good water exchange performance

Only rely on sufficient water exchange, in order to make the cage bait organisms and fishes must be dissolved oxygen continuously supplement; in order to make the box fish metabolism discharged waste with the water taken out of the cage. Therefore, the box should be located in the area of water flow, fresh water, oxygen rich, flow rate in the range of 0. 05 ~ 0. In 2m/s. The flow rate is too large, the energy consumption of fish is more, is not conducive to the growth of fish. Always clean the net, in order to maintain a good water efficiency. Cage layout should be reasonable, in order to increase the water.

Five, fish stocking and collocation

The breeding unit some in a cage raising fish, some in Polyculture inside the same two herbivorous fish, each with different approaches. Grass carp growth rate is fast, the weight gain rate is high, but the survival rate is high.