Pond ground cage capable of accurately catching freshwater shrimps and using method thereof

Abstract

The invention discloses a pond ground cage capable of accurately catching freshwater shrimps. Couplings with adjustable internal diameters are installed on one-way cage bodies on side faces. The pond ground cage is designed according to different figure features and different activity life habits of the freshwater shrimps and river crabs. To enable the freshwater shrimps to enter the ground cage smoothly and prevent the river crabs from entering the ground cage, the couplings with the adjustable internal diameters are arranged on the side faces of the ground cages, the internal diameters of the couplings are smaller than the smallest size of the river crabs but larger than the maximum diameter of the freshwater shrimps. Only the internal diameters of the couplings need to be changed when the freshwater shrimps are caught at different periods, and then the freshwater shrimps can be caught more accurately, the number of the river crabs entering the ground cage can be reduced to the maximum extent. The actual use verifies that when the pond ground cage is used for catching the river shrimps in a shrimp and crab mixed breeding pond, the number of the river crabs entering the cage can be reduced to the maximum extend, mutual killing of the river crabs in the ground cage can be avoided, the situation that the river shrimps are swallowed by the river crabs is basically eliminated, the yield of the river shrimps entering the cage is guaranteed, the workload of manual sorting of the crabs and the shrimps can be lowered to the maximum extent, and the composite economic results of a farmer can be improved.

Description

Technical field: [0001] The invention relates to a fishing tool for a mixed culture pond of green shrimp and river crab, in particular to a ground cage specially used for fishing green shrimp in a mixed culture pond of green shrimp and river crab. Background technique: [0002] With the continuous improvement of the ecological and efficient breeding technology of river crabs, the per unit yield of river crabs has continued to rise, and the yield per mu can reach 200 kg. Due to the continuous increase in the production of river crabs and the time to market is concentrated in October-November, the price of river crabs has been in a downturn due to objective factors such as the "three public consumption" restriction orders, and the ability of single river crab farming to resist market risks has gradually weakened. More and more farmers have begun to independently try to raise other aquatic products in crab ponds, such as freshwater shrimp, crayfish, sandfish, silver carp, manda...

AI Technical Summary

Problems solved by technology

At present, the trapping tools in crab and shrimp polyculture ponds are conventional ground cages. In actual trapping activities, river crabs will inevitably be caught in ground cages, which will not only cause space competition among river crabs in cages Killing each other, causing disability or death of weak and small crabs, directly affecting the output of river crabs, and what is more serious is that river crabs will swallow freshwater shrimps that enter the ground cage, directly reducing the production of freshwater shrimps and the economic benefits of farmers. Manual sorting of shrimp is labor-intensive and time-consuming, directly increasing the labor cost of sorting

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