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dc.contributor.authorStrand, Espen
dc.contributor.authorHuse, Geir
dc.date.accessioned2008-02-21T16:08:14Z
dc.date.issued2007-11-21
dc.identifier.urihttp://hdl.handle.net/11250/108661
dc.description.abstractWe investigate the trade-offs associated with vertical migration and swimming speed of Atlantic cod (Gadus morhua) using an adaptive individual-based model. Simulations with varying distribution and occurrence of prey, with and without swimbladder constraints, and visual predation were performed. Most simulations resulted in cod migrations between the bottom and pelagic zones. In simulations with high probability of encountering pelagic prey, the cod spent the daytime in the pelagic zone, moving to the bottom to feed only when no pelagic prey were encountered. At night the cod stayed in the pelagic zone to attain neutral buoyancy. In simulations with low occurrence of pelagic prey or high visual predation pressure, the cod remained at the bottom feeding on the consistently present benthic prey. If the pelagic prey occurred far above the sea floor or there were no benthic prey, the cod abandoned all bottom contact. The study thus predicts that the probability of encountering energy-rich pelagic prey is the key factor in driving vertical migration in adult cod. Buoyancy regulation is further shown to be an important constraint on vertical migration.
dc.format.extent562329 bytes
dc.format.mimetypeapplication/pdf
dc.language.isonoben
dc.publisherNRC Canadaen
dc.subjectatlantic coden
dc.subjectatlantisk torsken
dc.subjectvertical migrationen
dc.subjectswimming speeden
dc.subjectvertikal migrasjon
dc.subjectsvømmehastighet
dc.titleVertical migration in adult Atlantic cod (Gadus morhua)en
dc.typeJournal articleen
dc.typePeer reviewed
dc.source.pagenumber1747-1760en
dc.source.volume64en
dc.source.journalCanadian Journal of Fisheries and Aquatic Sciencesen
dc.source.issue12en
dc.identifier.doihttp://dx.doi.org/doi:10.1139/F07-135


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