VIETNAM

CONTENTS

Marine Fishing

Explanatory Notes

Trawls

Sourrounding Nets

Seine Nets

Gill Nets

Hook and Lines

Lift Nets

Traps

Cast Nets

Scoop Nets

Miscellaneous

Fishing Gear Monograph

 

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2. Stick-Held Falling Net

    This fishery is the biggest among cast net groups. They are used on powered boats with engines of 33 - 200 Hp. The main target species are squid, which are dried in the sun and are valuable export commodities. The main structure of the gear is bag-shaped with a mouth circumference of 40 - 70 m, at the mouth, the net is equipped with a sinker of 150 - 250 kg. The mouth of the net is closed through a system of purse-line and rings on the head rope.

     Normally, the net is made of PA monofilament of 0.2 - 0.3 mm in diameter or Nylon multifilament of 210D/4 - 210D/6 and the mesh size is 20 - 30 mm.

    The fishing operation is done at night. After a period using lure lights to gather the fish, the light intensity is gradually reduced to attract the fish to the water-surface to the place where the gear is dropped. The gear is already hung on the sticks attached on one side or both sides of the boat, then the link-pins are pulled out and the gear falls down covering the school of fish. The mouth of the net is closed by hauling on the purse-line. Many operations can be done during a night.

Net Setting:

The fishing operation is as follows:

- Spreading the net

- Gradually reducing the lighting on each group

- Controlling the light intensity to gather squid on the surface, under the spread net

- Pulling the pins to let the net down and catch the whole school of squid

Net Hauling:

     When the net sinks to 15 - 20 m deep, it can catch the squids. The purse line is hauled to close the net mouth, then hauled up on board by winch.

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