Bergen Open Research Archive

Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern

Bergen Open Research Archive

Show simple item record Myksvoll, Mari Skuggedal eng Sundby, Svein eng Ådlandsvik, Bjørn eng Vikebø, Frode B. eng 2012-04-18T10:40:48Z 2012-04-18T10:40:48Z 2011-08-01 eng
dc.identifier.citation Marine and Coastal Fisheries 3(1): 279–294 en
dc.identifier.issn 1942-5120 eng
dc.description.abstract Norwegian coastal cod form a stationary population of Atlantic cod Gadus morhua consisting of several genetically separated subpopulations. A small-scale differentiation in marine populations with pelagic eggs and larvae is made possible by local retention of early life stages in coastal environments. A numerical model was used to simulate the circulation in a fjord system in northern Norway over 2 years with different river runoff patterns. The dispersal of cod eggs was calculated with a particle-tracking model that used three-dimensional currents. The observed thickness of the low-salinity surface layer was well reproduced by the model, but the surface salinity was generally lower in the model than in the observations. The cod eggs attained a subsurface vertical distribution, avoiding the surface and causing retention. Interannual variations in river runoff can cause small changes in the vertical distribution of cod eggs and larger changes in the vertical current structure. Retention in the fjord system was strong in both years, but some eggs were subjected to offshore transport over a limited time period. The timing of offshore transport depended on the precipitation and temperatures in adjacent drainage areas. A possible match between maximized spawning and offshore transport may have a negative effect on local recruitment. en
dc.language.iso eng eng
dc.publisher American Fisheries Society eng
dc.relation.ispartof <a href="" target="blank">Connectivity among subpopulations of Norwegian Coastal cod. Impacts of physical-biological factors during egg stages.</a> en
dc.title Retention of Coastal Cod Eggs in a Fjord Caused by Interactions between Egg Buoyancy and Circulation Pattern eng
dc.type Peer reviewed eng
dc.type Journal article eng
dc.subject.nsi VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 eng
dc.subject.nsi VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 eng
dc.rights.holder Copyright American Fisheries Society 2011
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng
bibo.doi eng

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