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Pontoon trap for salmon and trout equipped with a seal exclusion device catches larger salmons
Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Biologi. Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Stockholm, Sweden.ORCID-id: 0000-0003-3073-0496
Harmångers Machine & Marine, Stocka, Sweden; Department of Wildlife, Fish and Environmental studies, Swedish University of Agricultural Sciences, Umeå, Sweden.
Institute of Freshwater Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Stockholm, Sweden.
Institute of Coastal Research, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Lysekil, Sweden.
2018 (Engelska)Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, nr 7, artikel-id e0201164Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The growing seal populations of the Baltic have led to more frequent interactions with coastal fisheries. The motivation for seals to interact with fishing gear is high. It provides high densities of fish. A successful means of mitigating the conflict is the pontoon trap. Seal visits here have been frequent. Seals have access to most parts of the trap system including the middle chamber, which is an overhead environment. Concerns have been raised about seals possible entanglement in this specific part of the trap. As a means of keeping seals from entering the middle chamber, two different Seal Exclusion Devices (SEDs) were tested. A diamond mesh SED and a square mesh SED, which was rotated 45. The aim was to compare the functionality of the different SEDs with respect to seal deterrent abilities and catch composition. The hypothesis tested were (i) that seals would not be able to enter the middle chamber, (ii) that the catch would increase and (iii) that the SED would deter larger fish from swimming into the middle chamber. Catch data and underwater film were collected. Larger salmons were caught in traps equipped with SEDs. The SEDs did not affect the number of caught fish or the total catch per soak day. © 2018 Calamnius et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Ort, förlag, år, upplaga, sidor
PLoS , 2018. Vol. 13, nr 7, artikel-id e0201164
Nyckelord [en]
animal experiment, animal trapping, Article, Baltic Sea, controlled study, fishery, fishing, intermethod comparison, nonhuman, organismal interaction, Pinnipedia, pontoon trap, Salmo trutta, salmonine, seal exclusion device, swimming
Nationell ämneskategori
Fisk- och akvakulturforskning
Identifikatorer
URN: urn:nbn:se:hig:diva-27634DOI: 10.1371/journal.pone.0201164ISI: 000439952400056PubMedID: 30048493Scopus ID: 2-s2.0-85050665604OAI: oai:DiVA.org:hig-27634DiVA, id: diva2:1238629
Forskningsfinansiär
Jordbruksverket
Anmärkning

Operational Program for Fisheries in Sweden 2007 - 2013 (Swedish Board of Agriculture)

European Union, European Fisheries Fund Investing in sustainable fisheries Grant no 18-7965/11

Harmangers Machine and Marine  

The Wildlife Damage Centre, through the Swedish Agency for Marine and Water Management  

County Administrative Board of Gavleborg  Grant no 2342-15 

University of Gävle  

Sven-Gunnar Lunneryd of Program Seals Fisheries 

Tillgänglig från: 2018-08-14 Skapad: 2018-08-14 Senast uppdaterad: 2018-09-05Bibliografiskt granskad

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