Engineering development of flexible selectivity grids for Nephrops

Type Article
Date 2006-06
Language English
Author(s) Loaec Henri1, Morandeau Fabien2, Meillat Marc2, Davies PeterORCID1
Affiliation(s) 1 : IFREMER, Ctr Brest, Mat & Struct Grp, French Ocean Res Inst, F-29280 Plouzane, France.
2 : IFREMER, Ctr Lorient, Fishing Technol Grp, French Ocean Res Inst, F-56100 Lorient, France.
Source Fisheries Research (0165-7836) (Elsevier), 2006-06 , Vol. 79 , N. 1-2 , P. 210-218
DOI 10.1016/j.fishres.2006.01.011
WOS© Times Cited 21
Keyword(s) Damage resistance, Polyurethane, Nephrops, Grid, Size selection, By catch, Selectivity
Abstract There are different approaches to selectivity, including increasing cod-end mesh size, square mesh panels and rigid grids. Selectivity grids have traditionally been produced to be as rigid as possible to maintain spacing but this can result in heavy, expensive grids, handling problems and brittleness. This paper presents an alternative approach using flexible polyurethane polymers to produce lightweight inexpensive grids with much improved damage tolerance and ease of handling, which also possess interesting selectivity characteristics. The material selection, design and development tests are described first, then preliminary sea trial results are presented. A flexible grid with a 20 mm spacing between bars performed successfully and enabled a reduction in juvenile catch of 87% by weight to be achieved, but also significant loss of commercial catch. Further development will concentrate on reducing the spacing to optimise selectivity. (c) 2006 Elsevier B.V. All rights reserved.
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