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The effects of survey design and circulation pattern on the perceived abundance of herring larvae: a case study for Norwegian spring spawning herring (Clupea harengus)
Stenevik, E.K.; Nash, R.D.M.; Vikebø, F.; Fossum, P.; Bakkeplass, K. (2012). The effects of survey design and circulation pattern on the perceived abundance of herring larvae: a case study for Norwegian spring spawning herring (Clupea harengus). Fish. Oceanogr. 21(5): 363–373. hdl.handle.net/10.1111/j.1365-2419.2012.00631.x
In: Fisheries Oceanography. Blackwell Science: Oxford. ISSN 1054-6006, more
Peer reviewed article  

Available in Authors | Dataset 

Keywords
    Larvae; Ocean models; Particle tracking; Clupea harengus Linnaeus, 1758 [WoRMS]; Clupea harengus Linnaeus, 1758 [WoRMS]; ANE, Norway [Marine Regions]; Marine
Author keywords
    Herring; Norway coast; Survey design

Authors  Top | Dataset 
  • Stenevik, E.K.
  • Nash, R.D.M.
  • Vikebø, F.
  • Fossum, P.
  • Bakkeplass, K.

Abstract
    A larval survey is used in the annual assessment as an index of the spawning stock size of Norwegian spring spawning herring (Clupea harengus). To test how inter-annual fluctuations in circulation pattern, survey design and execution of the survey affected the larval abundance estimate we conducted simulated surveys using a model framework with idealized assumptions to model larval drift and sampled larvae using several realistic survey scenarios. The results suggest that inter-annual variations in circulation pattern alone can have a profound effect on the perception of larvae abundance and that the direction of the survey (north to south versus south to north) can have a significant effect on the estimated abundance, particularly if hatching occurs over a short period of time. Additionally, disruptions to a continuous survey schedule also have an effect and, as such, sampling strategies in case of disruption to the survey are proposed.

Dataset
  • IMR Herring larvae monitoring, more

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