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- Title
Comparing and modifying penaeid beam and otter trawls to improve ecological efficiencies.
- Authors
McHugh, M. J.; Broadhurst, M. K.; Sterling, D. J.; Millar, R. B.
- Abstract
In an attempt to improve the selectivity and engineering performances of generic penaeid trawls, three established and one novel spreading-mechanism configurations were assessed: otter boards attached (1) with and (2) without 3.15-m sweeps to a 7.35-m headline trawl, and a beam rigged directly to a 9.19-m trawl (3) with and (4) without a horizontal wire and plastic streamers. Despite more surface area (7.5 vs 6.0 m²), both beam-trawl configurations had significantly lower drag than the otter trawls (≤30%). When catches were standardised to per ha, the otter trawl with sweeps retained significantly more (1.3-2.4 times) school prawns, Metapenaeus macleayi (Haswell), than the other three configurations. Within systems, removing sweeps or adding a horizontal wire significantly reduced the unwanted catches of a key teleost (southern herring, Herklotsichthys castelnaui Ogilby) by 41 and 48%. The results illustrate the utility of simple anterior modifications for independently addressing penaeidtrawling environmental issues.
- Subjects
FISHING equipment; TRAWLING; PERFORMANCE evaluation; STREAMERS (Fly fishing); ENVIRONMENTAL protection
- Publication
Fisheries Management & Ecology, 2014, Vol 21, Issue 4, p299
- ISSN
0969-997X
- Publication type
Article
- DOI
10.1111/fme.12079