Adjustable diameter net cage catching device and method of use

By using an adjustable diameter net cage harvesting device, the fish inlet and fishing space can be adjusted through the linkage of the flared part and the bottom net part. This solves the problems of difficulty in gathering fish, low harvesting efficiency and fish escape in traditional net cage harvesting devices, thereby improving harvesting efficiency and reducing fish loss rate.

CN120477148BActive Publication Date: 2026-07-24SHANGHAI OCEAN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI OCEAN UNIV
Filing Date
2025-07-02
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional net cage harvesting devices suffer from problems such as difficulty in gathering fish, low harvesting efficiency, high fish loss rate, and net damage. Furthermore, the fixed size of the fish collection frame cannot be adjusted, leading to fish escaping during the harvesting process.

Method used

An adjustable diameter net cage harvesting device is adopted. Through the linkage of the flared part and the bottom net part, the fish inlet and the fishing space can be adjusted. By using the extension and contraction of the pleated tube, combined with the adaptive rotation of the support cylinder, the diameter of the net and the net skirt can be adjusted. By the mutual approach and distance between the bottom net part and the net skirt, the fish inlet space is quickly closed and the fish are gathered together.

Benefits of technology

It improved the efficiency of catching fish, reduced the fish loss rate, prevented fish from escaping, and facilitated unified collection operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses an adjustable diameter net cage harvesting device and its usage method. The device includes a floating platform, a net, a flared end component, a net skirt, and a bottom net component. The lower part of the net has an outwardly flared funnel-shaped structure. The flared end component is installed between the net and the net skirt and has multiple circumferentially spaced cylindrical components and pleated tubes connected between the cylindrical components. The cylindrical components have a first cylindrical component and a second cylindrical component that are rotatably connected to each other. When water is injected or drained from the pleated tubes, the pleated tubes can extend and contract accordingly. The bottom net component is linked to the net skirt through a pulling component, allowing them to move closer and further apart. After the bottom net component contacts the net skirt, it can move upward synchronously with the net skirt. This invention not only allows for the adjustment of the fish inlet and fishing space to suit different harvesting requirements, but also enables the fish inlet space to close quickly to prevent fish from escaping, improving harvesting efficiency. Furthermore, it allows fish to gather from bottom to top, facilitating unified collection operations and reducing fish loss.
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