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Map quality and short review of studies used to identify spawning areas and periods
The map of the North Sea autumn spawning herring spawning areas in Payne (2010) is based on Iles and Sinclair (1982), Corten (1986), Heath et al. (1997), and Nash et al. (2009). The definition of the spawning areas and spawning periods is based on data from the ICES herring larval surveys (IHLS) (1967 till now), evaluated and reviewed by Heath 1993. These surveys still run, and results are reported to ICES WGIPS (WGIPS 2014). Data can be downloaded from http://www.ices.dk/marine-data/data-portals/Pages/Eggs-and-larvae.aspx.

Also local spring spawning herring (spawning from 1 March - 30 April) might be found along the eastern coast of UK.

Kvalitetsvurdering av kart
Kartet fra Payne (2010) som viser gyteområdene for nordsjøsild bygger på Iles og Sinclair (1982), Corten (1986), Heath et al. (1997), og Nash et al. (2009). Gyteområder og –perioder er definert fra data fra ICES sine sildelarvetokt i Nordsjøen (IHLS) (1967 til nå), evaluert og beskrevet Heath (1993). Disse toktene går fremdeles, og resultatene rapporteres til ICES WGIPS (WGIPS 2014). Data kan lasts ned fra http://www.ices.dk/marine-data/data-portals/Pages/Eggs-and-larvae.aspx.

Også lokal vårgytende sild (gyteperiode: 1. mars til 30. april) kan påtreffes langs Storbritannias østkyst.

References 
Corten, A. 1986. On the causes of the recruitment failure of herring in the central and northern North Sea in the years 1972–1978. Journal du Conseil International pour l’Exploration de la Mer, 42: 281–294.
Heath, M. 1993. An evaluation and review of the ICES herring larval surveys in the North-Sea and adjacent waters. Bulletin of Marine Science, 53: 795–817.
Heath, M., Scott, B., and Bryant, A. D. 1997. Modelling the growth of herring from four different stocks in the North Sea. Journal of Sea Research, 38: 413–436.
Nash, R. D. M., Dickey-Collas, M., and Kell, L. T. 2009. Stock and recruitment in Sea herring (Clupea harengus); compensation and depensation in the population dynamics. Fisheries Research, 95: 88–97.
Payne M 2010. Mind the gaps: a state-space model for analysing the dynamics of North Sea herring spawning components. ICES Journal of Marine Science 67: 1939–1947.
WGIPS 2014. Report of the Working Group of International Pelagic Surveys (WGIPS) 20-24 January 2014. ICES CM 2014/SSGESST:01. 366 p.
Barentswatch Norway Digital Kyst og fiskeri Nordsjøen Skagerrak Økosystem Fisk Artsutbredelse Art Utbredelse Nordsjøsild Herring in the North Sea Utbredelseskart Clupea harengus infoMapAccessService Regional
Kartet viser utbredelsen av nordsjøsild.
Latinsk navn: Clupea harengus                                                                                                                                                                                                                                                                                            Familie: Clupeidae
Leveområde: Nordsjøen, Skagerrak og Kattegat
Hovedgyteområde: Nordvestlige Nordsjøen (Shetland)
For mer informasjon se:
http://www.imr.no/temasider/fisk/sild/nordsjosild/nb-no
Nordsjøsild WMS