Dolphins and the Tuna Industry (1992) / Chapter Skim
Currently Skimming:
8 Recommendations
8 Recommendations
Pages 110-119
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From page 110... ...
However, it was the clear consensus of this committee that the problem of reducing dolphin mortality from tuna fishing in the ETP is far from solved. The effects of the voluntary ban by the canneries on actual dolphin mortality, for example, are uncertain.
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From page 111... ...
could be built and tested immediately on commercial fishing trips. The most promising of these are the current profiler, jet boat, double corkline, pearshaped snap rings, and polyester net.
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From page 112... ...
From a global perspective, the only way to reduce dolphin mortality is either to develop gear and techniques that will safely and efficiently harvest the tuna found beneath dolphins or to stop setting nets on dolphins. The current approach to the problem monitoring the dolphin mortality and prodding the backdown process toward perfection—will almost certainly not achieve zero mortality.
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From page 113... ...
Such a program should include two facets: · An experimental research program of innovative gear that would investigate performance and techniques. This program would have access to a modern commercial purse seiner as a dedicated vessel that would not be constrained by the normal pressures of tuna productivity.
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From page 114... ...
In summary, thorough videotaping of events throughout a set should provide a great deal of new information about behavior during seining. The Effects of Chasing Dolphin Herds No specific information is available concerning the effects of the chase on the biology of dolphins.
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From page 115... ...
The Potential for Maneuvering Tuna and Dolphins Inside the Seine and Dolphin Release-Gate Tests If current models of dolphin-herd function are correct, as discussed in Chapter 7, then it should be possible to predict the size of openings that will be required to exploit normal escape behavior of dolphins to produce quick and complete release of dolphins from tuna seines. Three needs must be met if this concept can be used to release dolphins during tuna seining.
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From page 116... ...
Tracking Flotsam-Assocu~ted Yellowfin Tuna Placing sonic tags on tuna caught near flotsam or FADs would provide valuable data on that association as well as data for comparison with those obtained from dolphin-associated tuna. Comparative data from large yellowfin tuna associated with flotsam are especially important.
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From page 117... ...
Differences exist in the size-specific fishing mortality rates imposed by dolphin sets and non-dolphin sets, the result being that sets of the latter type produce lower yield per recruit than the former. Although a relationship between stock size and recruitment has not been detected for the range of observed population levels, increased pressure on young tuna eventually may reduce adult stock size to a level at which recruitment may be reduced, which would further decrease overall production.
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From page 118... ...
In the short term, existing FADs could be deployed and monitored by observer-manned commercial fishing vessels. In the long term, a chartered purse seiner could be used to investigate the performance of such new technologies as submerged FADs, which may have a greater potential than surface FADs for attracting and holding commercially harvestable schools of large yellowfin tuna.
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From page 119... ...
The committee recommends that both programs be initiated immediately. The vessel captain educational, monitoring, and incentives program should be created through international meetings of government and industry representatives of all nations currently purse seining in the ETP.
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