Dolphins and the Tuna Industry (1992) / Chapter Skim
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3 Background on Fishing Gear
3 Background on Fishing Gear
Pages 34-37
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From page 34... ...
The process of purse seining any species of fish involves the encircling of the school with a long net to form a circular wall of netting (see Figure 3-1~. The net must be deep enough to discourage escape underneath it and the encircling must be done rapidly enough to prevent escape before the ends are closed.
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From page 35... ...
The remainder of the normal purse-seining operation involves "sacking up" the catch or reducing the volume of water inside the net until it is possible to bring the catch aboard using a large dip net called a "brailer." This is done through a process of bringing most of the net aboard, leaving only a small sack of reinforced netting in the water to confine the catch for brailing. Once the fish are removed, the remainder of the seine is brought aboard and made ready for the next set.
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From page 36... ...
Most of the NMFS and industry effort during the 1970s was spent in attempting to perfect the design of the seine and the detailed techniques of its use for improved backdown effectiveness. The modifications that came out of that effort resulted in significant reductions in dolphin mortality (Coe et al., 1984~.
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From page 37... ...
Other nations have similar regulations. OTHER FISHING METHODS Although purse seining for yellowfin tuna associated with dolphins in the ETP is the primary focus of this report, other methods, including additional purse-seining modes, are used for catching yellowfin.
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