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Size selection of herring (Clupea harengus membras) in a pontoon trap equipped with a rigid grid
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology. (Biologi)
Harmångers Maskin & Marin AB, Industriområdet 2, 820 74 Stocka, Sweden.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology. (Biologi)
Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistg. 5, SE-453 21 Lysekil, Sweden.
2011 (English)In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 108, no 1, p. 81-87Article in journal (Refereed) Published
Abstract [en]

A sustainable fishery in the Baltic and Bothnian Seas requires the development and introduction of fishing gear which fishes selectively and at the same time excludes raiding seals. The purpose of this study was twofold: firstly to test and evaluate rigid grids as a method for retaining only larger herring in a pontoon trap, and secondly to analyze which factors were influencing the selection process. The results demonstrate that it is indeed possible to sort herring by size in a pontoon fish chamber. The efficiency of excluding undersized herring was at best 27%, using a selection grid covering just over 0.1% of the fish chamber wall. The factors which have most effect on the selection were the quantity of fish in the trap, the season of the year, the time of day and the presence of seals. (C) 2010 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2011. Vol. 108, no 1, p. 81-87
Keywords [en]
Grey seal, Bothnian Sea, Herring, Pontoon trap, Selection, Baltic, Grid, Sorting
Identifiers
URN: urn:nbn:se:hig:diva-10258DOI: 10.1016/j.fishres.2010.12.001ISI: 000287428500011Scopus ID: 2-s2.0-79251599704OAI: oai:DiVA.org:hig-10258DiVA, id: diva2:442943
Available from: 2011-09-22 Created: 2011-09-21 Last updated: 2018-03-13Bibliographically approved

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Lundin, MikaelCalamnius, LindaHillstrom, Lars

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