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dc.contributor.authorMichelsen, Helena Kling
dc.contributor.authorFagerli, Camilla With
dc.contributor.authorChristie, Hartvig C
dc.date.accessioned2022-04-21T07:58:34Z
dc.date.available2022-04-21T07:58:34Z
dc.date.created2022-04-20T16:55:12Z
dc.date.issued2022
dc.identifier.isbn978-82-577-7473-8
dc.identifier.issn1894-7948
dc.identifier.urihttps://hdl.handle.net/11250/2991823
dc.descriptionProject Manager Helena Kling Michelsenen_US
dc.description.abstractNIVA did a 2-day environmental evaluation of the diver operated suction device “C disc” constructed by C robotics. Because the C disc uses suction from a water pump to suck sea urchins from the seafloor, it will collect bycatch and may have some harmful effects on the seafloor. It can also be used for kelp restoration in northern-Norway. This survey tested the C disc at two sea urchin barren grounds around Tromsø (Ytre Kårvika, Kvalsundet and Berg, Balsfjord) in May 2021. Analysis of catch efficiency on target sea urchins, bycatch and effects on the sea floor using video transects and frame counts was done at both sites. About 81 – 89 % of the catch consisted of the target species sea urchins and the CPUE was on average 78 ind./min (61 – 96 ind./min). Of these 11 % were damaged by the C disc. Bycatch accounted for 11 and 19 % of the catch and reflected the local community consisting of mainly larger loose sitting organisms. There was little to no damage observed on bycatch organisms, except for barnacle and blue mussels. There was a reduction in loosely fastened organisms after using the C disc, and the most impacted organisms reflected the bycatch. If the bycatch is kept in sea water and returned to sea soon after capture, they are likely to survive. The survey is only representative for hardbottom sea urchin barrens in northern-Norway.en_US
dc.language.isoengen_US
dc.publisherNorsk institutt for vannforskningen_US
dc.relation.ispartofNIVA-rapport
dc.relation.ispartofseriesNIVA-rapport;7737-2022
dc.subjectUndervannsstøvsugeren_US
dc.subjectSuction deviceen_US
dc.subjectRestaureringen_US
dc.subjectRestorationen_US
dc.subjectMiljøundersøkelseen_US
dc.subjectEnvironmental surveyen_US
dc.subjectKråkebolleren_US
dc.subjectSea urchinsen_US
dc.titleEnvironmental impacts of the diver operated C disc to harvest sea urchins and for kelp restorationen_US
dc.title.alternativeEnvironmental impacts of the diver operated C disc to harvest sea urchins and for kelp restorationen_US
dc.typeResearch reporten_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© Norsk institutt for vannforskning/Norwegian Institute for Water Research. The publication can be cited freely if the source is stated.en_US
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400en_US
dc.subject.nsiVDP::Mathematics and natural scienses: 400en_US
dc.source.pagenumber23en_US
dc.source.issue7737-2022en_US
dc.identifier.cristin2017975
cristin.ispublishedtrue
cristin.fulltextoriginal


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