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The efficiency of selection grids in perch pontoon traps
Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Biologi. Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies, Umeå, Sweden and Harmångers Maskin and Marin AB. (Biologi)
Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Biologi. Harmångers Maskin and Marin AB. (Biologi)
Swedish University of Agricultural Sciences, Department of Aquatic Resources, Lysekil.
Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies, Umeå, Sweden.
2015 (engelsk)Inngår i: Fisheries Research, ISSN 0165-7836, E-ISSN 1872-6763, Vol. 162, s. 58-63Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
2015. Vol. 162, s. 58-63
Emneord [en]
bycatch, perch, pontoon trap, selection grid, selection efficiency
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-17705DOI: 10.1016/j.fishres.2014.09.017ISI: 000347761700010Scopus ID: 2-s2.0-84910026330OAI: oai:DiVA.org:hig-17705DiVA, id: diva2:762054
Tilgjengelig fra: 2014-11-10 Laget: 2014-10-20 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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