A risk assessment framework for the reduction of cetacean by‐catches

A risk assessment framework for the reduction of cetacean by‐catches JOHN HARWOOD* NERC Sea Mammal Research Unit, Gatty Marine Laboratory, Uni6ersity of St Andrews, St Andrews, Fife, UK KEY WORDS: small cetaceans; by-catch; risk assessment; incidental mortality INTRODUCTION The ecological problems caused by the by-catch of dolphins (mostly Stenella spp.) by the purse seine fishery for yellowfin tuna (Thunnus albacares) in the eastern Pacific Ocean are well known. A combination of management actions has reduced this by-catch from about 350000 animals during the 1960s to less than 4000 in 1993 (Joseph, 1994). However, many other fisheries also have a significant by-catch of marine mammals. For example, many thousands of small cetaceans of a wide range of species are by-caught annually in gill nets (Perrin et al., 1994). There is considerable concern about the effect that such by-catches may be having on the status of the harbour porpoise (Phocoena phocoena) in the North Sea and adjacent waters (Anon., 1996). The number of porpoises stranded around the southern North Sea (Smeenk, 1987) and incidental sightings in coastal waters (Verwey and Wolff, 1981) have declined substantially since the 1950s. Although the reasons for this decline are not well understood, several recent studies (Berggren, 1994; Vinther, 1995; Tregenza et al., 1997) have http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Conservation: Marine and Freshwater Ecosystems Wiley

A risk assessment framework for the reduction of cetacean by‐catches

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Publisher
Wiley
Copyright
Copyright © 1999 John Wiley & Sons, Ltd.
ISSN
1052-7613
eISSN
1099-0755
D.O.I.
10.1002/(SICI)1099-0755(199911/12)9:6<593::AID-AQC388>3.0.CO;2-1
Publisher site
See Article on Publisher Site

Abstract

JOHN HARWOOD* NERC Sea Mammal Research Unit, Gatty Marine Laboratory, Uni6ersity of St Andrews, St Andrews, Fife, UK KEY WORDS: small cetaceans; by-catch; risk assessment; incidental mortality INTRODUCTION The ecological problems caused by the by-catch of dolphins (mostly Stenella spp.) by the purse seine fishery for yellowfin tuna (Thunnus albacares) in the eastern Pacific Ocean are well known. A combination of management actions has reduced this by-catch from about 350000 animals during the 1960s to less than 4000 in 1993 (Joseph, 1994). However, many other fisheries also have a significant by-catch of marine mammals. For example, many thousands of small cetaceans of a wide range of species are by-caught annually in gill nets (Perrin et al., 1994). There is considerable concern about the effect that such by-catches may be having on the status of the harbour porpoise (Phocoena phocoena) in the North Sea and adjacent waters (Anon., 1996). The number of porpoises stranded around the southern North Sea (Smeenk, 1987) and incidental sightings in coastal waters (Verwey and Wolff, 1981) have declined substantially since the 1950s. Although the reasons for this decline are not well understood, several recent studies (Berggren, 1994; Vinther, 1995; Tregenza et al., 1997) have

Journal

Aquatic Conservation: Marine and Freshwater EcosystemsWiley

Published: Nov 1, 1999

References

  • Pingers, porpoises and power: uncertainties with using pingers to reduce bycatch of small cetaceans
    Dawson, Dawson; Read, Read; Slooten, Slooten

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