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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Optimising mesh size with escape gaps in a dual-species portunid-trap fishery
Aquaculture and Fisheries, Vol.5(6), pp.308-316
11/2020
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Abstract
In south-eastern Australia, the same baited, round traps (comprising 50–57-mm mesh netting) are used to target giant mud, Scylla serrata and blue swimmer crabs, Portunus armatus in spatially separated fisheries. Both fisheries are characterised by the common, problematic discarding of undersized portunids (<85 and 65 mm carapace length; CL for S. serrata and P. armatus) and fish (yellowfin bream, Acanthopagrus australis). This poor selectivity was addressed here in two experiments assessing the utility of (1) traps partially or completely covered in larger mesh (91 mm to match the minimum legal size of the smaller P. armatus), and then (2) any cumulative benefits of fitting species-specific escape gaps. In experiment 1, there were no differences among catches of legal-sized portunids associated with either partial, or complete trap coverage with larger mesh. Irrespective of mesh coverage, both designs of 91-mm traps also retained significantly fewer (by up to 42%) undersized P. armatus and A. australis. In experiment 2, replicate traps completely covered in 91-mm mesh were tested against conventional traps comprising 56-mm mesh, and traps with the same mesh sizes, but also three escape gaps configured for either S. serrata (46 × 120 mm) or P. armatus (36 × 120 mm) (i.e. four treatments in total). All modified traps maintained catches of legal-sized S. serrata, and only the 91-mm traps with escape gaps caught fewer legal-sized P. armatus. Fewer undersized S. serrata, P. armatus and A. australis (mean catches reduced by up to 49%) were retained in all larger-meshed than small-meshed traps, and in all of those traps with escape gaps (by up to 95%) than without. While there were no significant cumulative benefits of escape gaps in larger-meshed traps (measured by a statistical interaction), there was a trend of fewer unwanted catches overall. These data support configuring portunid traps with mesh sizes matching the morphology of the smallest legal-sized target species. But, simply retroactively fitting escape gaps in existing, smaller-meshed traps will also realize positive selectivity benefits.
Details
- Title
- Optimising mesh size with escape gaps in a dual-species portunid-trap fishery
- Creators
- Matt K Broadhurst (Author) - NSW Department of Primary Industries, Fisheries Conservation Technology Unit, National Marine Science Centre, PO Box 4321, Coffs Harbour, NSW, 2450, AustraliaDaniel J Tolhurst (Author) - The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, United KingdomBrian Hughes (Author) - Hunter Local Land Services, PO Box 440, Taree, NSW, 2430, AustraliaVincent Raoult (Author) - School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW, 2258, AustraliaTimothy M Smith (Author) - School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW, 2258, AustraliaTroy F Gaston (Author) - School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW, 2258, Australia
- Publication Details
- Aquaculture and Fisheries, Vol.5(6), pp.308-316
- Publisher
- Elsevier B.V
- Identifiers
- 991012927061202368
- Academic Unit
- National Marine Science Centre
- Language
- English
- Resource Type
- Journal article