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  • 1.
    Lundin, Mikael
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology. Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies, Umeå, Sweden; Harmångers Maskin and Marin AB .
    Calamnius, Linda
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology. Harmångers Maskin and Marin AB.
    Fjälling, Arne
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Drottningholm, Sweden.
    Size selection of whitefish (Coregonus maraena) in a pontoon trap equipped with an encircling square mesh selection panel2015In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 161, p. 330-335Article in journal (Refereed)
    Abstract [en]

    Many fishing methods result in significant catches of non-target species or individuals that are too small to be retained for economic values or within quota regulations. In the Baltic Sea trap fishery, the major problem is the bycatch of juvenile and non-marketable whitefish (Coregonus maraena) which constitutes a threat to the sustainability of the fishery and a time-consuming problem for the fishers. This study evaluates the effectiveness of a modified fish trap in reducing such bycatch. An encircling selection panel consisting of 50 × 50 mm square mesh netting was installed in a pontoon fish chamber of a salmon/whitefish trap. Comparative fishing was conducted against a control trap without selection panel in the inshore waters of the Bothnian Sea. Comparisons of catch compositions between the traps showed that there was a 72% reduction in juvenile whitefish catch in the experimental trap. The length at 50% retention (30.1 cm) corresponded well to the minimum market size (>30 cm) of whitefish that are desired for the local market. Fishers are advised to use a netting panel of 50 × 50 mm square mesh for their traps to reduce undersized whitefish. The results are important for the sustainability of whitefish stocks in the Baltic Sea.

  • 2.
    Lundin, Mikael
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology.
    Calamnius, Linda
    Harmångers Maskin & Marin AB, Industriområdet 2, 820 74 Stocka, Sweden.
    Hillstrom, Lars
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology.
    Lunneryd, Sven-Gunnar
    Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistg. 5, SE-453 21 Lysekil, Sweden.
    Size selection of herring (Clupea harengus membras) in a pontoon trap equipped with a rigid grid2011In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 108, no 1, p. 81-87Article in journal (Refereed)
    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.

  • 3.
    Lundin, Mikael
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology. Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies, Umeå, Sweden and Harmångers Maskin and Marin AB.
    Calamnius, Linda
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology. Harmångers Maskin and Marin AB.
    Lunneryd, Sven-Gunnar
    Swedish University of Agricultural Sciences, Department of Aquatic Resources, Lysekil.
    Magnhagen, Carin
    Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies, Umeå, Sweden.
    The efficiency of selection grids in perch pontoon traps2015In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 162, p. 58-63Article in journal (Refereed)
    Abstract [en]

    In commercial fishing, minimizing the bycatch of undersized fish or non-target species is highly beneficial, to avoid unnecessary fish mortality and to save time for the fishers. Two pontoon traps developed for perch fishing were equipped with size selection grids, and the efficiency with which under-sized fish could escape was tested. Average size of perch, roach, and whitefish was larger in traps with selection grids compared to in control traps without grids. Selection efficiencies using these comparisons were 82–86% for perch, 33% for whitefish and 100% for roach. The selection grids were filmed with an underwater video camera over the daily cycle, to estimate timing, and total number of exits from the traps. Selection efficiencies, calculated by extrapolating number of escapes observed to the total time of trap submergence, were 94–100% for perch and 100% for roach. The discrepancy in the selection efficiency estimates for perch probably depends on an uncertainty in the extrapolation, because of the variation in escape rate across time periods. Perch and roach differed in time of day for escapes. For perch most escapees was seen in the evening, and for roach most fish escaped at night, probably reflecting the general activity cycles of the two species. Over a fishing season, several thousands of fish would be able to escape from each trap, and an increase in the use of size selection grids could potentially be an efficient tool for fish population management.

  • 4.
    Lundin, Mikael
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology.
    Ovegård, Mikael
    Department of Aquatic Resources, Swedish University of Agricultural Sciences, Skolg. 6, SE-742 42 Öregund, Sweden.
    Calamnius, Linda
    Harmångers Maskin & Marin AB, Industriområdet 2, 820 74 Stocka, Sweden.
    Hillström, Lars
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Biology.
    Lunneryd, Sven-Gunnar
    Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistg. 5, SE-453 21 Lysekil, Sweden.
    Selection efficiency of encircling grids in a herring pontoon trap2011In: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 111, no 1-2, p. 127-130Article in journal (Refereed)
    Abstract [en]

    High bycatches of undersized herring constitute a major problem in the Baltic Sea herring trap fishery. In an attempt to reduce these bycatches, this field study evaluates the efficiency of rigid selection grids encircling a herring pontoon trap. The results show that 54-72% of the undersized herring were removed from the catch. The introduction of such grids would therefore represent a significant step towards a more efficient and sustainable herring fishery in the Baltic Sea. © 2011 Elsevier B.V.

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