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Progressively evaluating a penaeid W trawl to improve eco-efficiency

Citation

Balash, C and Sterling, D and Broadhurst, MK, Progressively evaluating a penaeid W trawl to improve eco-efficiency, Fisheries Research, 181 pp. 148-154. ISSN 0165-7836 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Crown Copyright

DOI: doi:10.1016/j.fishres.2016.04.011

Abstract

The W trawl is a proposed innovation for more eco-efficient penaeid trawling-via reduced energy intensity and benthic contact. A significant portion of the drag-generated, netting tension of the W trawl is directed away from the wings to centre-line bracing ropes that are connected to a central towing wire through an intermediary sled. This configuration facilitates substantially smaller otter boards than normal, and consequently less drag and seabed contact. Here we compared the engineering and catching implications of subtle, progressive rigging changes to a W trawl paired against a standard Florida flyer trawl; both rigged with another eco-efficient modification, termed the 'batwing' otter board (suitably sized for each trawl). The W-trawl refinements included: (i) securing netting at the wing ends to prevent sliding; (ii) moving the headline forward and footrope aft; and (iii) inserting dan lenos at the wing ends. The first two modifications resulted in a maximum drag reduction by the W trawl of up to 11% for a 1.14 × increase in spread. Catches ha -1 of mostly retained (commercially important) large brachyurans and cephalopods were maintained, but penaeid catches were reduced in the W trawl (by at least 33%), which was mostly attributed to less than optimal ground-gear contact. This study provides a base for future research to concurrently reduce the energy intensity and habitat impacts of penaeid trawls, via holistic modifications.

Item Details

Item Type:Refereed Article
Keywords:batwing otter board, drag reduction, selectivity trawling, eco-efficiency
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Fin Fish (excl. Tuna)
Author:Balash, C (Dr Cheslav Balash)
ID Code:119142
Year Published:2016
Web of Science® Times Cited:1
Deposited By:Australian Maritime College
Deposited On:2017-07-26
Last Modified:2017-09-04
Downloads:0

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