Device and method for catching cold water fish in large aquaculture net cage in summer

Abstract

The invention belongs to the technical field of development of aquaculture and ocean resource, and relates to a device and method for catching cold water fish in a large aquaculture net cage in summer. The device comprises a floating frame, a fish collecting part and a fish guiding channel which are connected in sequence, the floating frame is fixedly arranged on an upper half portion of the fish collecting part, and a lower half portion of the fish collecting part is connected with the fish guiding channel; a light inducing device is arranged in the fish guiding channel; during use, high-temperature water in the fish collecting part is pumped out through a water pump, such that cold water at a bottom layer enters the fish collecting part; fish schools are induced to enter the fish collecting part through bait and the light inducing device; after the fish schools in the fish collecting part reach a certain density, a connecting part is closed and fish in the fish collecting part is captured; and after fishing is completed, the device is removed. The provided device and method are used for fishing, the device is removed after fishing is completed, and normal culture in the net cage can be recovered. The device is simple, the method is easy to implement, a physiological mechanism and behavioral characteristics of fish are fully considered and utilized, and a problem of catching cold water fish cultured in warm sea areas in summer is solved.

Description

technical field [0001] The invention belongs to the technical field of aquaculture and marine resources development, and relates to a device for catching cold-water fish in a large-scale culture cage in a warm sea area in summer, and in particular to a device and method for catching cold-water fish in a large-scale culture cage in summer , used to support the expansion of seawater fish cage culture to deep sea. Background technique [0002] The cold water mass of the Yellow Sea is located in the deep layer and bottom of the central part of the Yellow Sea in my country. In summer, the water temperature is low and the water quality is good. The sea area is about 130,000 square kilometers and the water volume is 500 billion cubic meters. It can be used to breed cold-water marine economic species such as salmon and trout. In 2018, my country independently developed and built the world's first fully submersible deep-sea aquaculture cage "Deep Blue No. 1", and is currently buildin...

AI Technical Summary

Problems solved by technology

Practice has proved that the device is prone to failure under the conditions of corrosion and high sea conditions, and it will affect the time-sensitive fishing and production plan

At present, bottom trawling is the main way to catch deep-water fish in batches in the ocean. Fish cultured in ordinary cages are mainly caught by purse seine. There is no simple and reliable fishing technology and method for deep-water fish cultured in large-scale cages. device

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