CN105594641A - Purse net for polyculture of fish and prawn - Google Patents

Abstract

The invention discloses a purse net for the polyculture of a fish and a prawn. The purse net for the polyculture of the fish and the prawn comprises multiple fixing columns and multiple net pieces, wherein the net pieces and the fixing columns form an enclosed structure; the bottoms of the net pieces are all provided with net sinking bags; the diameters of meshes of the net pieces are 3cm to 4cm. The purse net for the polyculture of the fish and the prawn is simple in structure, and is easy to manufacture; the quantity of the net pieces can be randomly combined to realize the change of the area size of the purse net according to the flatness condition and the area size of the bottom of a culturing pond and the different yields of the fish and the prawn which are subjected to the polyculture; the fish and the prawn which are subjected to the polyculture are effectively fed in an isolation manner; the feeding amount of high-value prawn feed is reduced; the utilization rate of the prawn feed is improved; the economic benefit of culture is increased.

Description

A purse seine for fish and shrimp mixed culture

technical field

The invention relates to an aquatic animal breeding device, in particular to a purse seine for polyculture of fish and shrimp.

Background technique

The pond culture of Litopenaeus vannamei is an important part of my country's mariculture industry. In the past three years, due to the deterioration of the breeding environment and the continuous degradation of germplasm resources, diseases have occurred frequently, and the success rate of breeding has decreased year after year. In 2015, most of the farmers lost money or even failed to harvest. Changing the existing farming model and implementing polyculture of fish and shrimp with more stable production will be the sustainable development trend of Litopenaeus vannamei farming in the future. The main problem in ponds where fish and shrimp are mixed is that if the number of mixed fish is small, the occurrence of shrimp diseases cannot be prevented and controlled, and if the number of mixed fish is too large, it will eat high The lack of valuable shrimp feed will affect the feeding and growth of prawns, resulting in waste of shrimp feed and reducing the economic benefits of farming.

At present, there are two main methods of feeding fish and shrimp mixed feed: one is to feed the fish first and then feed the shrimp, that is, first feed the fish with floating water feed, and then feed the shrimp with submerged shrimp feed. The medium-submerged shrimp feed is very likely to be eaten by mixed fish, resulting in a large amount of high-value submerged shrimp feed and low utilization rate, which affects the economic benefits of fish and shrimp farming; secondly, set up isolation nets to keep fish and shrimp The fish and shrimp in the polyculture pond are fed separately. The polyculture isolation net currently used in the fish and shrimp polyculture pond needs to be buried in the bottom mud of the culture pond 20-30 cm in advance, and the upper end is exposed to the water surface and fixed at an interval of 3-5 meters. On the wooden pile, on the one hand, the installation of the isolation net is relatively complicated and the installation workload is large; on the other hand, the isolation net is fixedly installed in the mud of the pond, which is inconvenient to disassemble. When the production of fish and shrimp in the breeding pond increases, it is difficult to adjust in time The position of the isolation net increases the seine area for submerged shrimp feeding.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a purse seine for polyculture of fish and shrimp, which can feed fish and shrimp separately, effectively reduce the feeding amount of shrimp feed, improve the utilization rate of shrimp feed, and increase the economic benefits of breeding .

In order to achieve the above object, the technical scheme that the present invention takes:

A purse seine for fish and shrimp polyculture, comprising several fixed posts and several mesh sheets, the mesh sheets and the fixed posts form a closed structure, the bottoms of the mesh sheets are all provided with sinking mesh bags, and the nets of the mesh sheets The hole diameter is 3-4cm.

As an optimal technical solution, in order to make the purse seine suitable for aquaculture ponds with variable shapes, improve the applicability, and at the same time ensure the convenience of putting in the submerged material, so as to facilitate the eating of shrimp, the mesh and the fixing column are combined into a rectangular structure.

As a preferred technical solution, in order to ensure that the size of the mesh is easy to purchase and improve the convenience of installation of the fence, the length of the mesh is 3 or 5m and the width is 1.5m.

As an optimal technical solution, in order to effectively prevent fish from entering the purse seine from the bottom of the mesh, and at the same time ensure the stability of the mesh and facilitate disassembly and installation, the sinking net bag is set as a canvas bag filled with sand.

Compared with the prior art, the present invention has the beneficial effects:

1. The mesh and the fixed column form a closed structure, and the mesh diameter of the mesh is set reasonably, and there is a sinking net bag. The structure is simple and stable, and it is easy to realize. It can effectively isolate the polyculture fish from the closed structure, and realize fish and fish. Feeding shrimp separately can effectively reduce the feeding amount of shrimp feed, improve the utilization rate of shrimp feed, and increase the economic benefits of farming.

2. The mesh and fixed column are combined into a rectangular structure, which is basically suitable for the existing rectangular aquaculture ponds. At the same time, according to the amount of fish and shrimp production, the number of mesh can be combined at will to realize the change of the seine area, which is convenient and practical .

3. The size of the mesh is reasonably set according to the specifications of the existing materials in the market, which improves the convenience of the installation of the seine; at the same time, the sinking mesh bag is set as a canvas bag filled with sand, which not only ensures the stability of the mesh, but also ensures that the mesh is easy to disassemble Install.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural representation of the present invention;

Accompanying figure number: 1, fixed column, 2, mesh sheet, 3, sink net bag, 4, fixed rope.

detailed description

Propose a kind of specific embodiment of the present invention as shown in Figure 1, a kind of purse seine of fish and shrimp polyculture, comprises several root diameters and is the fixed post 1 of 10cm wooden stick and several pieces of net sheet 2, and described net sheet 1 passes fixed rope 4 is fixed on the fixed column 1, and is combined into a closed structure, considering the stability of fixing, the height of the height of the fixed column 1, the height of the mesh sheet 2, according to the flat situation at the bottom of the culture pond, the area size and the different output of mixed fish and shrimp, can be Randomly combine the quantity of the mesh 2 and the fixed column 1, change the size of the closed structure area, the bottom of the mesh 2 is provided with sinking net bag 3, the mesh diameter of the mesh 1 is 3 ~ 4cm, 3 ~ 4cm The 4cm mesh allows shrimps to enter and exit freely, and restricts mixed fish from entering the seine.

The mesh 2 and the fixed column 1 are combined into a rectangular structure. On the one hand, the rectangular structure is convenient for feeding shrimp, and on the other hand, it can provide a relatively large feeding area for the prawns, which is convenient for the feeding of the prawns. , the mesh 2 and the fixed column 1 are combined into rectangular structures with different areas, which has high applicability.

Considering the material specifications and sizes in the existing market, in order to facilitate purchase, the length of the mesh 2 is 3 or 5m; considering that the water level depth of the existing polyculture pond is generally about 1.1m, the width of the mesh 2 is 1.5m, which can better meet the use conditions of existing polyculture ponds, and has a wide range of applications.

Considering that the sinking net bag 3 is soaked in muddy water for a long time, it is very easy to be corroded, and at the same time, it can effectively prevent the mixed fish from entering the seine from the bottom of the mesh sheet 2, and it is convenient to adjust the change of the seine due to the increase in the production of mixed fish and shrimp The size of the area, the sinker bag 3 is set to a canvas bag filled with sand.

When the present invention is in use: consider the stability and ease of installation of the seine, and select one or several areas where the terrain is relatively flat to install the seine according to the terrain conditions of the breeding pond; first put sand in the sinking net bag 3, and then put The fixed column 1 is fixed in the flat area, and finally the mesh is fixed on the fixed column 1 by the fixed rope 4. According to the size of the pond and the output of fish and shrimp, the corresponding rectangular area for feeding prawn feed is surrounded.

When feeding, first use the automatic feeder to feed the mixed fish with floating water fish feed for 1 hour, and then start feeding the submerged shrimp feed to feed the prawns, and the prawn feed is evenly put in the seine.

Of course, the above is only a detailed description of the preferred specific implementation of the present invention in conjunction with the accompanying drawings, and is not intended to limit the scope of the present invention. All equivalent changes made according to the principle, structure and structure of the present invention should be covered by this within the scope of protection of the invention.

Claims (4)

1. a purse seine for fish and shrimp polyculture, comprising some fixed posts (1) and some sheet nets (2), is characterized in that: described net sheet (1) and fixed post (2) form closed structure, so The bottoms of the mesh sheets (2) are provided with sinking mesh bags (3), and the mesh diameters of the mesh sheets (2) are 3-4 cm. 2. A purse seine for fish and shrimp polyculture according to claim 1, characterized in that: the mesh (2) and the fixing column (1) are combined into a rectangular structure. 3. A purse seine for fish and shrimp polyculture according to claim 2, characterized in that: the length of the mesh (2) is 3 or 5m, and the width is 1.5m. 4. A seine net for polyculture of fish and shrimp according to any one of claims 1-3, characterized in that: the sinking net bag (3) is set as a canvas bag filled with sand.