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dc.contributor.authorAlves, Dário Mendes
dc.date.accessioned2006-10-10T09:57:09Z
dc.date.available2006-10-10T09:57:09Z
dc.date.issued2003-06-05
dc.description.abstractAnalysis of video recordings performed by the submersible “Nautile” in the Bay of Biscay, NE Atlantic indicated that demersal fish species are associated to different types of deep-sea habitats. Four different dive transects were analysed with respect to environmental characteristics. A total of 19 fish groups were ordinated by means of canonical correspondence analysis, and the investigation was performed at the individual fish level. Microhabitat fauna was dominated by a diversity of suspension feeders indicating different gradients of bottom hydrology, particularly vertical and horizontal current flow. Physical, geological and biological factors revealed different strategies of habitat selection in fish. The most represented species, the orange roughy (Hoplostethus atlanticus) showed a clear association with complex bottoms, including coral reefs. Others, such as Coryphaenoides rupestris and Synaphobranchus kaupi, showed higher flexibility of adjustment to changing environments. These traits can be utilised in the study of the environmental impact of deep-sea fishing. Based on the same dives, the locomotory behaviour of 13 fish species was studied with basis on a qualitative analysis of selected individuals. The main swimming modes used in shallow waters were also detected in the demersal environment. Clear differences in locomotory behaviour were found among fish species, reflecting both convergence and diversity of strategies of utilization of the demersal niche space.en
dc.format.extent4325617 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10037/321
dc.identifier.urnURN:NBN:no-uit_munin_170
dc.language.isoengen
dc.publisherUniversitetet i Tromsøen
dc.publisherUniversity of Tromsø
dc.rights.accessRightsopenAccess
dc.rights.holderCopyright 2003 The Author(s)
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Ressursbiologi: 921en
dc.subjectSubmersible observationsen
dc.subjectdeep-sea fisheriesen
dc.subjectdeep-sea microhabitatsen
dc.subjectbiodiversityen
dc.subjecthabitat useen
dc.subjectlocomotory modesen
dc.titleBehaviour and patterns of habitat utilisation by deep-sea fish. Analysis of observations recorded by the submersible Nautilus in "98" in the Bay of Biscay, NE Atlanticen
dc.typeMaster thesisen
dc.typeMastergradsoppgaveen


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