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Method for large-scale catch of copepods by tides

A copepod and tidal current technology, applied in the field of marine fishing, can solve the problems of low efficiency and energy consumption, and achieve the effects of fast starting, improving labor efficiency and saving manpower or mechanical power

Active Publication Date: 2012-07-25
宁德市富发水产有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This fishing method is energy-intensive and inefficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for large-scale fishing of copepods by using tidal currents is characterized in that: on a floating raft platform fixed in the sea area, multiple nets with an area of ​​5-8m are hung 2 , The net body length is 15-25m, and the net bag length is 1.5-2.0m without wings. The mouth of the net faces the tide, and the seawater and the copepods in it flow into the net continuously by the tide, the seawater is filtered away, and the copepods are caught in the net bag. The steps are as follows:

[0026] 1. Select the sea area: Select river estuary sea areas with mixed sea and fresh water, specific gravity 1.005-1.015, fertile water quality, and distribution of copepods; the tidal current in the sea area should be a straight reciprocating flow with a flow velocity between 0.2-2.0m / s.

[0027] Net setting: The opening of the net is about a rectangular shape with a length and width of 2:1. The two long sides are the upper and lower sides respectively. The upper part...

Embodiment 2

[0031] Similar to Embodiment 1, the difference is: throw multi-door iron anchors on the seabed facing the tide, and connect the truss rope of each door anchor to a net with an area of ​​5-8m 2, The net body length is 15-25m, and the net bag length is 1.5-2.0m without wings. Make the mouth of the net face the tide, and rely on the tide to continuously let the seawater and the copepods flow into the net, the seawater is filtered away, and the copepods are caught in the net bag. When catching copepods, generally before the ebb tide speed rises to 0.2m / s, anchor against the ebb tide and hang nets to catch; class, anchor. Similarly, before the high tide speed rises to 0.2m / s, drop the anchor against the high tide tide and hang the net to catch; . In addition, during low tide or high tide, copepods can also be harvested by pulling nets temporarily as needed.

Embodiment 3

[0033] Similar to Example 1, the difference is that a plurality of wooden piles or iron piles are laid on the seabed, and each pile is connected to a network port with an area of ​​5-8m by a truss rope. 2 , the net body length is 15-25 m, and the net capsule length is 1.5-2.0 m without wings. The mouth of the net can automatically face the tide with the change of the flow direction, and rely on the tide to continuously let seawater and the copepods flow into the net, the seawater is filtered away, and the copepods are caught in the net bag. When harvesting copepods, because the net mouth of this method will automatically face the tide, so after hanging the net once, multiple tidal nets can be harvested. There is no need to re-hang and retract the net every tide. Each time, the copepods can be harvested by pulling the net when the flow velocity of the low tide or high tide drops by nearly 0.2m / s.

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PUM

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Abstract

The invention provides a method for large-scale catch of copepods by tides, which includes: hanging hundreds of wingless trap nets on mast ropes on a fixed platform or a plurality of anchors or stakes; allowing openings of the nets to face tides; and allowing the copepods to automatically flow into the trap nets to be caught by the falling tides or rising tides. People can haul the nets on demand to collect the copepods in the nets, and the method can be used for catching the copepods in tidy periods, except the no-tide or small-tide periods on or near the time of high tides and low tides. The method is energy-saving, efficient and applicable to development of large-scale and industrial fishing.

Description

technical field [0001] The invention relates to an ocean fishing method, in particular to a method for large-scale fishing of copepods by using tidal currents. Background technique [0002] The late larvae and juvenile stages (i.e. fry) of marine fishes especially require nutrients of highly unsaturated fatty acids. If it is lacking, a kind of "swelling fat disease" will occur in fry and cause mass death, or even annihilation of the whole army. Copepods are a type of tiny crustacean zooplankton that grow in the ocean and are rich in highly unsaturated fatty acids. They are high-quality bait for artificially breeding seawater fish fry such as large yellow croaker. Only large-scale development of copepods as fish fry bait, large-scale artificial breeding of sea fish such as large yellow croaker is possible. [0003] At present, plankton such as copepods in the sea are collected, and ships are towed with plankton nets (equivalent to upper-layer trawls). With this fishing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K67/033
Inventor 刘家富韩坤煌张艺刘招坤黄伟卿
Owner 宁德市富发水产有限公司
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