Modifying otter boards to reduce bottom contact: Effects on catches and efficiencies of triple-rigged penaeid trawls

Broadhurst, M.K., Sterling, D.J. and Millar, R.B. (2015) Modifying otter boards to reduce bottom contact: Effects on catches and efficiencies of triple-rigged penaeid trawls. Fisheries Management and Ecology, 22 5: 407-418. doi:10.1111/fme.12140


Author Broadhurst, M.K.
Sterling, D.J.
Millar, R.B.
Title Modifying otter boards to reduce bottom contact: Effects on catches and efficiencies of triple-rigged penaeid trawls
Journal name Fisheries Management and Ecology   Check publisher's open access policy
ISSN 1365-2400
0969-997X
Publication date 2015-10-01
Year available 2015
Sub-type Article (original research)
DOI 10.1111/fme.12140
Open Access Status Not Open Access
Volume 22
Issue 5
Start page 407
End page 418
Total pages 12
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2016
Language eng
Abstract Two otter-board modifications designed to minimise bottom contact (and therefore habitat impacts) were compared against conventional otter boards for their relative effects on the engineering and catching efficiencies of triple-rigged penaeid trawls. The first modification involved restricting the angle of attack (AOA) of a flat-rectangular otter board to <30° by attaching a restraining line to an adjacent sled, while the second was a 'batwing' otter board comprising a sled-and-sail assembly operating at 20° AOA. The modifications reduced otter-board bottom contact by up to 8 ha over a night's fishing without affecting standardised catches (per ha) of the targeted eastern king prawns, Penaeus plebejus, nor the fuel required. Further, compared to all other trawls, the restrained trawls caught less discarded bycatch (by up to 37%), while the trawls spread by the modified flat-rectangular and batwing otter boards caught more individuals of three retained benthic teleost species per ha than the conventional configuration; results that were attributed to species-specific herding responses. Both modifications represent simple alternatives where there are concerns over either benthic impacts or, for the restraining line, unwanted bycatches in penaeid-trawl fisheries.
Keyword Bycatch reduction
Habitat impacts
Otter boards
Penaeids
Selectivity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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