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Distribution and reproduction strategies of krill (Euphausiacea) on the Norwegian shelf

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Abstract

Meganyctiphanes norvegica and Thysanoessa inermis were the dominant krill species that were observed on the Norwegian shelf. T. inermis and M. norvegica were found in abundances of up to 14 and 22 no. m−2, respectively, on the mid Norwegian shelf (Møre plateau, Halten, Sklinna, Træna banks) and up to the Lofoten area. The main distribution of the krill indicates that they are mostly restricted to the Atlantic waters of the shelf region in April and little krill was observed south of 62°N. The two dominant krill species appeared to have different strategies for the timing of spawning, thus avoiding direct overlap of spawning products. The majority of the T. inermis females were in the spawning condition in April. Meganyctiphanes norvegica appeared to spawn at least a month later. The sizes of the first time spawners of T. inermis were around 11–16 mm, and they were approximately 1 year old. The sizes of the second time spawners were around 17–22 mm. The spawning of krill on the Norwegian shelf coincides with the blooming of the spring phytoplankton in this region . Advection of eggs and larvae of krill, as well as other plankton, is important not only to the shelf and slope region, but also for the functioning of the wider Norwegian Sea ecosystem and the adjacent areas.

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Acknowledgements

I would like to thank Signe Johannessen, Laura Rey, and Natalia Zhukova for their assistance in krill sampling and analysis. This study was partially funded by two projects: (a) MarCoast (European Space Agency (ESA) cat-1 AO.1521 and (b) CABANERA (Norwegian Research Council). I thank ACRI (France) for providing me with satellite information.

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  1. Institute of Marine Research, P.O. Box 18070, 5817, Bergen, Norway

    Padmini Dalpadado

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  1. Padmini Dalpadado
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Correspondence to Padmini Dalpadado.

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Dalpadado, P. Distribution and reproduction strategies of krill (Euphausiacea) on the Norwegian shelf. Polar Biol 29, 849–859 (2006). https://doi.org/10.1007/s00300-006-0123-8

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