Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height

Steven J. Kennelly*, Valentina Melli, Matt K. Broadhurst

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Penaeid trawling is among the world's least selective fishing methods; a characteristic that has evoked spatial closures being implemented in some fisheries if certain bycatch limits are exceeded. For decades, considerable work has been done to develop modifications to penaeid trawls that reduce unwanted bycatches, with most focussed at the posterior section (i.e. codend). More recently, efforts have examined ways to prevent bycatch entry into trawls entirely—via modifications to anterior components. This study assessed the utility of proactively lowering the headlines of Australian penaeid trawls, using clips at the otter boards, to 68% and 54% of their conventional height, and demonstrated mean total bycatch reductions (by weight) of 69% and 79%, respectively, with no effects on the targeted Metapenaeus macleayi (Haswell). The results provide insights into the location and behaviour of various species in the water column preceding capture, and support a simple and easy method for regional fishers to use in situ to avoid excessive bycatch and associated fishing closures. More broadly, the data support ongoing efforts in other penaeid-trawl fisheries to reduce bycatches via similar, rapid adjustments to anterior components, depending on species-specific behaviours during capture.
Original languageEnglish
JournalFisheries Management and Ecology
Volume26
Issue number6
Pages (from-to)630-637
Number of pages8
ISSN0969-997X
DOIs
Publication statusPublished - 2019

Keywords

  • Bycatch reduction
  • Headline height
  • Penaeid trawls

Cite this

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title = "Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height",
abstract = "Penaeid trawling is among the world's least selective fishing methods; a characteristic that has evoked spatial closures being implemented in some fisheries if certain bycatch limits are exceeded. For decades, considerable work has been done to develop modifications to penaeid trawls that reduce unwanted bycatches, with most focussed at the posterior section (i.e. codend). More recently, efforts have examined ways to prevent bycatch entry into trawls entirely—via modifications to anterior components. This study assessed the utility of proactively lowering the headlines of Australian penaeid trawls, using clips at the otter boards, to 68{\%} and 54{\%} of their conventional height, and demonstrated mean total bycatch reductions (by weight) of 69{\%} and 79{\%}, respectively, with no effects on the targeted Metapenaeus macleayi (Haswell). The results provide insights into the location and behaviour of various species in the water column preceding capture, and support a simple and easy method for regional fishers to use in situ to avoid excessive bycatch and associated fishing closures. More broadly, the data support ongoing efforts in other penaeid-trawl fisheries to reduce bycatches via similar, rapid adjustments to anterior components, depending on species-specific behaviours during capture.",
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Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height. / Kennelly, Steven J.; Melli, Valentina; Broadhurst, Matt K.

In: Fisheries Management and Ecology, Vol. 26, No. 6, 2019, p. 630-637.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height

AU - Kennelly, Steven J.

AU - Melli, Valentina

AU - Broadhurst, Matt K.

PY - 2019

Y1 - 2019

N2 - Penaeid trawling is among the world's least selective fishing methods; a characteristic that has evoked spatial closures being implemented in some fisheries if certain bycatch limits are exceeded. For decades, considerable work has been done to develop modifications to penaeid trawls that reduce unwanted bycatches, with most focussed at the posterior section (i.e. codend). More recently, efforts have examined ways to prevent bycatch entry into trawls entirely—via modifications to anterior components. This study assessed the utility of proactively lowering the headlines of Australian penaeid trawls, using clips at the otter boards, to 68% and 54% of their conventional height, and demonstrated mean total bycatch reductions (by weight) of 69% and 79%, respectively, with no effects on the targeted Metapenaeus macleayi (Haswell). The results provide insights into the location and behaviour of various species in the water column preceding capture, and support a simple and easy method for regional fishers to use in situ to avoid excessive bycatch and associated fishing closures. More broadly, the data support ongoing efforts in other penaeid-trawl fisheries to reduce bycatches via similar, rapid adjustments to anterior components, depending on species-specific behaviours during capture.

AB - Penaeid trawling is among the world's least selective fishing methods; a characteristic that has evoked spatial closures being implemented in some fisheries if certain bycatch limits are exceeded. For decades, considerable work has been done to develop modifications to penaeid trawls that reduce unwanted bycatches, with most focussed at the posterior section (i.e. codend). More recently, efforts have examined ways to prevent bycatch entry into trawls entirely—via modifications to anterior components. This study assessed the utility of proactively lowering the headlines of Australian penaeid trawls, using clips at the otter boards, to 68% and 54% of their conventional height, and demonstrated mean total bycatch reductions (by weight) of 69% and 79%, respectively, with no effects on the targeted Metapenaeus macleayi (Haswell). The results provide insights into the location and behaviour of various species in the water column preceding capture, and support a simple and easy method for regional fishers to use in situ to avoid excessive bycatch and associated fishing closures. More broadly, the data support ongoing efforts in other penaeid-trawl fisheries to reduce bycatches via similar, rapid adjustments to anterior components, depending on species-specific behaviours during capture.

KW - Bycatch reduction

KW - Headline height

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