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Shark depredation and unwanted bycatch in Pelagic longline fisheries: industry practices and attitudes, and shark avoidance strategies

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Gilman, E and Dalzell, P and Goren, M and Werner, T and Clarke, S and Brothers, N and Alfaro-Shigueto, J and Mandelman, J and Mangel, J and Petersen, S and Piovano, S and Thomson, N (2007) Shark depredation and unwanted bycatch in Pelagic longline fisheries: industry practices and attitudes, and shark avoidance strategies. Western Pacific Regional Fishery Management Council, Honolulu, Hawaii. ISBN 1-934061-06-9

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Abstract

Substantial ecological, economic and social problems result from
shark interactions in pelagic longline fisheries. Improved
understanding of industry attitudes and practices towards
shark interactions assists with managing these problems.
Information on fisher knowledge and new strategies for
shark avoidance may benefit sharks and fishers. A study of
12 pelagic longline fisheries from eight countries shows that
incentives to avoid sharks vary along a continuum, based
on whether sharks represent an economic disadvantage or
advantage. Shark avoidance practices are limited, including
avoiding certain areas, moving when shark interaction
rates are high, using fish instead of squid for bait and deeper
setting. Some conventionally employed fishing gear and
methods used to target non-shark species contribute to shark
avoidance. Shark repellents hold promise; more research
and development is needed. Development of specifically
designed equipment to discard sharks could improve shark post
release survival prospects, reduce gear loss and improve crew
safety. With expanding exploitation of sharks for fins and meat,
improved data collection, monitoring and precautionary shark
management measures are needed to ensure shark fishing
mortality levels are sustainable.

Item Type: Book
Publisher: Western Pacific Regional Fishery Management Council
Additional Information:

© 2007 Western Pacific Regional Fishery Management Council

Date Deposited: 07 Apr 2008 16:02
Last Modified: 07 Jun 2010 02:04
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