The hypoxia avoidance behaviour of juvenile Atlantic cod (Gadus morhua L.) depends on the provision and pressure level of an O2 refuge

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dc.contributor.author Herbert, Neill en
dc.contributor.author Skjæraasen, JE en
dc.contributor.author Nilsen, T en
dc.contributor.author Salvanes, AGV en
dc.contributor.author Steffensen, JF en
dc.date.accessioned 2012-04-01T22:43:47Z en
dc.date.issued 2011 en
dc.identifier.citation Marine Biology 158(4):737-746 2011 en
dc.identifier.issn 0025-3162 en
dc.identifier.uri http://hdl.handle.net/2292/16291 en
dc.description.abstract The frequency of low O_{2} (hypoxia) has increased in coastal marine areas but how fish avoid deleterious water masses is not yet clear. To assess whether the presence and oxygen pressure (PO_{2}) level of an O_{2} refuge affects the hypoxia avoidance behaviour of fish, individual Atlantic cod (Gadus morhua L.) were exposed to a range of O_{2} choices in a 2-way choice chamber at 11.4°C over two different experiments. Cod in the first experiment were allowed access to a fixed O_{2} refuge (fully air-saturated seawater) whilst oxygen pressure (PO_{2}) on the other side was reduced in steps to a critically low level, i.e. 4.3 kPa—a point where cod can no longer regulate O_{2} consumption. Under these conditions, cod did not avoid any level of hypoxia and fish swimming speed also remained unchanged. In contrast, strong avoidance reactions were exhibited in a second experiment when fish were again exposed to 4.3 kPa but the safety, i.e. (PO_{2}), of the refuge was reduced. Fish not only spent less time at 4.3 kPa as a result of fewer sampling visits but they also swam at considerably slower speeds. The presence of an avoidance response was thus strongly related to refuge (PO_{2}) and it is unlikely that cod, and possibly other fish species, would enter low O_{2} to feed in the wild if a sufficiently safe O_{2} refuge was not available. It is therefore hypothesized that the feeding range of fish may be heavily compressed if hypoxia expands and intensifies in future years. en
dc.publisher Springer en
dc.relation.ispartofseries Marine Biology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0025-3162/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title The hypoxia avoidance behaviour of juvenile Atlantic cod (Gadus morhua L.) depends on the provision and pressure level of an O2 refuge en
dc.type Journal Article en
dc.identifier.doi 10.1007/s00227-010-1601-7 en
pubs.issue 4 en
pubs.begin-page 737 en
pubs.volume 158 en
dc.rights.holder Copyright: Springer-Verlag en
pubs.end-page 746 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 209420 en
pubs.org-id Science en
pubs.org-id Marine Science en
pubs.record-created-at-source-date 2012-02-22 en


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