2011
DOI: 10.1093/icesjms/fsr055
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Extreme spawning-site fidelity in Atlantic cod

Abstract: Skjæraasen, J. E., Meager, J. J., Karlsen, Ø., Hutchings, J. A., and Fernö, A. 2011. Extreme spawning-site fidelity in Atlantic cod. – ICES Journal of Marine Science, 68: 1472–1477. Based on a 3-year mark-recapture study, evidence is provided of spawning-site fidelity in Atlantic cod (Gadus morhua) at a scale (<1 km) smaller than documented previously. Coastal regions where barriers to dispersal exist may allow for local population dynamics and adaptation to develop in broadcast-spawning marine fish at extr… Show more

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Cited by 74 publications
(45 citation statements)
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“…One could argue that this population spawned in the Skagerrak or Kattegat during the Viking Age, but such a scenario is implausible; historical records of the Norwegian fisheries since the 12th century show that spatial fluctuations in the distribution of fishing effort targeting these spawning aggregations have been restricted (43,66). Furthermore, our ancient data are also consistent with observed long-term spawning fidelity in the North Sea region (67,68); the genetic affinity of the ancient Orkney population, a focus of fishing since the Viking Age (69), agrees with those of modern individuals living in the North Sea. Similarly, we observe the specific affinity of one ancient Schleswig specimen toward a distinct population in the Øresund (70).…”
Section: Discussionsupporting
confidence: 83%
“…One could argue that this population spawned in the Skagerrak or Kattegat during the Viking Age, but such a scenario is implausible; historical records of the Norwegian fisheries since the 12th century show that spatial fluctuations in the distribution of fishing effort targeting these spawning aggregations have been restricted (43,66). Furthermore, our ancient data are also consistent with observed long-term spawning fidelity in the North Sea region (67,68); the genetic affinity of the ancient Orkney population, a focus of fishing since the Viking Age (69), agrees with those of modern individuals living in the North Sea. Similarly, we observe the specific affinity of one ancient Schleswig specimen toward a distinct population in the Øresund (70).…”
Section: Discussionsupporting
confidence: 83%
“…Together, these observations suggest a high degree of natal homing and spawning fidelity, but not necessarily to natal spawning areas (Beacham et al 2008), and some fish do stray to other spawning grounds. Evidence for spawning fidelity in marine fish has been reported in Atlantic cod (Green and Wroblewski 2000;Wright et al 2006;Skjaeraasen et al 2011) even for long distance (Bonanomi et al 2016), North Sea plaice (Pleuronectes platessa) (Hunter et al 2003), and bluefin tuna (Thunnus thynnus thynnus) in the western Atlantic (Nemerson et al 2000). All of our samples were collected in the spawning grounds and almost all fish were mature, suggesting that the stable pattern of gene flow was the result of straying of spawning fish.…”
Section: Discussionmentioning
confidence: 99%
“…Spending most of their lives on or near the sea floor, commercially harvested groundfish species include cod, haddock, halibut, flounders, pollock, whiting, hake, redfish, and monkfish. Some comprise metapopulations, with subpopulations mixing at times in deeper water, then returning seasonally to shallower natal spawning grounds in more dense concentrations (Bigelow 1924;Ames 2004;Reich and DeAlteris 2009;Skjaeraasen et al 2011). Most groundfish are harvested with otter trawls dragged behind boats more than 40′ long, and some exceeding 100'.…”
Section: Case Contextmentioning
confidence: 99%