Square-mesh codend circumference and selectivity

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dc.contributor.author Broadhurst, MK en
dc.contributor.author Millar, Russell en
dc.date.accessioned 2012-03-07T21:02:23Z en
dc.date.issued 2009 en
dc.identifier.citation ICES Journal of Marine Science 66(3):566-572 2009 en
dc.identifier.issn 1054-3139 en
dc.identifier.uri http://hdl.handle.net/2292/13314 en
dc.description.abstract Despite the wide-scale assessment and the use of square-mesh codends in demersal trawls, relatively few studies have tested the effects of configurations other than mesh size on their selectivity. We investigated the consequences of increasing the circumference of square-mesh codends used in an Australian penaeid fishery from the expected optimal configuration of ∼33% of maximum diamond-mesh extension to ∼56 and 75%. Three square-mesh designs comprised 27-mm polyamide mesh throughout and had the same length (100 bars, B), but different circumferences (90, 150, and 200 B, respectively). Paired simultaneous comparisons (using twin trawls) of each treatment codend against a small-meshed control revealed significant effects of circumference on the efficiency of the trawl for a small teleost (pink-breasted siphonfish, Siphamia roseigaster) and commercial size classes of school prawns (Metapenaeus macleayi). Compared with the 90 codend, pink-breasted siphonfish catches and prawn count (numbers per 500 g) were both significantly greater in the codends of larger circumference, and these effects are attributed to concomitant (i) convoluted or reduced lateral openings of meshes and (ii) lesser probabilities of organisms encountering meshes in the posterior section. These differences would not preclude the use of codends of larger circumference in the fishery, but they do highlight the need to select appropriate configurations in future studies to reduce the potential for including the confounding effects of different geometries. en
dc.publisher International Council for the Exploration of the Sea en
dc.relation.ispartofseries ICES Journal of Marine Science en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/1054-3139/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Square-mesh codend circumference and selectivity en
dc.type Journal Article en
dc.identifier.doi 10.1093/icesjms/fsp001 en
pubs.begin-page 566 en
pubs.volume 66 en
dc.rights.holder Copyright: International Council for the Exploration of the Sea en
pubs.end-page 572 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 92820 en
pubs.org-id Science en
pubs.org-id Statistics en
pubs.record-created-at-source-date 2010-09-01 en

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