Continuous trawl fishing method

A technology of trawl nets and mesh bags, which is applied in fishing nets, fishing, applications, etc., can solve the problems of fast death of catches, low quality, and high work intensity of personnel, and achieve the goals of reducing work intensity, improving quality, and improving work efficiency Effect

Active Publication Date: 2018-05-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a continuous trawling method to solve the problems of fast death, low quality and long-term retention in the net bag of the net gear caught in the prior art and the high work intensity of personnel in the fishing operation. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A, use 1440m * 361m (228.6m) net gear 20 to catch horse mackerel, drag the net gear 20 in the waters by boat 10 to carry out trawling operation, so that the catches to be caught enter the net bag at the net gear 20 tail 21 in. During the trawling operation, firstly trawle the net at a trawling speed of 2 to 3 knots for 20 minutes, and then reduce the trawling speed to 0.5 to 1 knot.

[0055] B. Simultaneously start the winches 41 of two traction devices 40 to pull the traction section 42, and move the net bag 21 of the net gear 20 forward, and the fish suction pipe 31 of the vacuum fish suction pump installed on the boat 10 stretches into the net bag 21 and contact the catch in the net bag 21, the net bag 21 advancing distance is 180m;

[0056] Simultaneously assist positioning fish suction pipe 31 by visual probe and net level meter sensor, cooperate to manipulate winch 41 to retract traction key 42, so that the mouth of mouth of fish suction pipe 31 contacts the catc...

Embodiment 2

[0062] A, use 1632m * 444m (277.4m) net gear 20 to catch horse mackerel, carry out trawling operation by ship 10 dragging net gear 20 in waters, so that the catches to be caught enter the net pocket of net gear 20 tail 21: During the trawling operation, first trawling the net at a trawling speed of 2.5-3 knots for 30 minutes, and then reducing the trawling speed to 1 knot.

[0063] B. Simultaneously start the winches 41 of two traction devices 40 to pull the traction section 42, so that the net bag 21 of the net gear 20 is pulled forward, and the fish suction pipe 31 of the vacuum fish suction pump installed on the boat 10 is stretched into the net. In the bag 21 and contact the catch in the net bag 21, the net bag 21 advancing distance is 230m;

[0064] Simultaneously assist positioning fish suction pipe 31 by visual probe and net level meter sensor, cooperate to manipulate winch 41 to retract traction key 42, so that the mouth of mouth of fish suction pipe 31 contacts the ca...

Embodiment 3

[0070]A, use 1040m * 253.02m (149.4m) net gear 20 to fish horse mackerel, carry out trawling operation by boat 10 dragging net gear 20 in waters, so that the catches to be caught enter the net at the net gear 20 tail In the capsule 21; during the trawling operation, first trawling the net at a trawl speed of 3 to 5 knots for 50 minutes, and then reducing the trawl speed to 1 to 1.5 knots.

[0071] B. Simultaneously start the winches 41 of two traction devices 40 to pull the traction section 42, and move the net bag 21 of the net gear 20 forward, and the fish suction pipe 31 of the vacuum fish suction pump installed on the boat 10 stretches into the net bag 21 and contact the catch in the net bag 21, the net bag 21 advancing distance is 130m;

[0072] Simultaneously assist positioning fish suction pipe 31 by visual probe and net position meter sensor, cooperate to manipulate winch 41 to retract traction key 42, so that the mouth of mouth of fish suction pipe 31 contacts the cat...

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Abstract

The invention provides a continuous trawl fishing method. The continuous trawl fishing method comprises the steps that a fishing net in a water area is dragged by a ship to perform trawl operation, sothat fished objects to be caught enter a net bag at the tail portion of the fishing net; then the net bag is dragged and moved to enable a fish sucking pipe of a vacuum fish sucking pump to stretch into the net bag; an opening of the fish sucking pipe makes contact with the fished objects in the net bag of the fish sucking pipe, and the vacuum fish sucking pump is operated so as to suck the fished objects in the net bag into a collecting tank through the fish sucking pipe; then the fished objects in the collecting tank are transferred immediately for freezing or direct processing treatment. The fished objects caught through the method is obviously improved in terms of stiffness time, the number of first-grade freshness fishes and the like, the histamine content is remarkably reduced, andthe quality of the fished objects is improved. In addition, the continuous trawl fishing method greatly saves net lifting time, the working intensity of sailors is reduced, and the method has the advantages of being efficient and capable of saving time.

Description

technical field [0001] The invention relates to the field of sea fishing operations, in particular to a continuous trawling fishing method, which can well control and greatly improve the quality of fish catches. Background technique [0002] In the past 30 years, due to the rapid development of trawling technology, China's offshore economic fish resources have declined sharply, and offshore trawls have long been in the state of catching juvenile fish and forage fish. Therefore, the development of pelagic trawling has become a new growth point of the marine fishing industry. Pelagic trawling operates in high sea fishing grounds far from the coastline, and catches pelagic fish resources such as saury, horse mackerel, and krill. Pelagic trawling has high requirements on fishing boats, and the configuration of fishing boats is more advanced. It has the characteristics of mechanization, high degree of automation, complete fishing aid and navigation equipment, and long battery li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K73/02
CPCA01K73/02A01K79/00A01K73/04A01K75/00
Inventor 丁玉庭王彦波隋闯周绪霞刘书来黄洪亮林龙
Owner ZHEJIANG UNIV OF TECH
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