Research article2011Peer reviewed
Size selection of herring (Clupea harengus membras) in a pontoon trap equipped with a rigid grid
Lundin, Mikael; Calamnius, Linda; Hillstrom, Lars; Lunneryd, Sven-Gunnar
Abstract
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
Keywords
Grey seal; Bothnian Sea; Herring; Pontoon trap; Selection; Baltic; Grid; Sorting
Published in
Fisheries Research
2011, Volume: 108, number: 1, pages: 81-87
UKÄ Subject classification
Fish and Aquacultural Science
Publication identifier
DOI: https://doi.org/10.1016/j.fishres.2010.12.001
Permanent link to this page (URI)
https://res.slu.se/id/publ/37153