A lifting mechanism-based fish gathering device and method

By introducing a vortex-type fish-attracting mechanism and a fish-driving and releasing mechanism into the fish collection device, the problem of damage caused by the crowding and movement of fish during the lifting of the fish collection box was solved, and stable transfer and high survival rate of fish were achieved.

CN121228645BActive Publication Date: 2026-02-03NANJING HYDRAULIC RES INST +1
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Patent Information

Application Number
CN202511785083.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-01
Publication Date
2026-02-03
Estimated Expiration
2045-12-01

AI Technical Summary

Technical Problem

During the lifting process of existing fish collection devices, the fish are prone to abrasions and collisions due to crowding and scrambling within the tank. The violent shaking of the water flow also causes changes in hydrostatic pressure, affecting the survival rate of the fish.

Method used

The design incorporates a vortex-type fish-attracting mechanism and a fish-driving and releasing mechanism. The vortex-type fish-attracting mechanism uses a water pump to create a laminar flow circulation, guiding fish into the fish collection box in an orderly manner. The silicone rod and blade structure are used to drive the fish during the release process, maintaining hydrostatic pressure and reducing frictional resistance.

Benefits of technology

It improved the survival rate of fish, avoided acute swim bladder damage, reduced the disturbance to fish during transportation, and enhanced the durability and stability of the device.

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Abstract

The application belongs to the technical field of water conservancy projects, and discloses a fish collecting device based on a lifting mechanism and a fish collecting method, wherein the fish collecting device based on the lifting mechanism comprises a fish collecting box body, a pair of tapered entrances are symmetrically arranged at the center of the two sides of the fish collecting box body, a pair of mounting plates are fixedly connected to the top edges of the fish collecting box body, and a protective shell is fixedly connected to the middle part of the fish collecting box body. Through cooperation of structures such as the arc-shaped bevel pipe, the inner bushing and the flexible spiral pad, a laminar flow type circular flow is generated in the fish collecting box body by the water pump, which is similar to a small vortex. The vortex drives the surrounding water to flow to the tapered entrance for fish entering, and forms a significant fish-attracting water flow. For fish species that like water flow, the water flow is used to drive fish into the fish collecting box body by using the rheotaxis of fish. The system can adjust the water pump power according to the body type, species and hydrological conditions of the target fish on the same day, so as to control the flow rate of the fish-attracting water flow and achieve the best effect.
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