Journal Article

System dynamics of the Barents Sea capelin

Harald Yndestad and Anne Stene

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 59, issue 6, pages 1155-1166
Published in print January 2002 | ISSN: 1054-3139
Published online January 2002 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2002.1285
System dynamics of the Barents Sea capelin

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The capelin (Mallotus villosus) in the Barents Sea plays a key role in the Arctic food web. The large fluctuations in the biomass of the Barents Sea capelin have been poorly understood and collapses in the biomass have occurred. A system analysis of the capelin stock has identified a state differential equation model and a frequency transfer function model of the stock properties. The results of this research show that the capelin stock dynamics is adapted to the 18.6 year and the 18.6/3=6.2 year lunar nodal tide that influences the temperature in the Barents Sea. An analysis of the capelin time series has identified a 6.2 yr cycle of recruitment, maturity and fish stock growth. An estimated frequency response of a stock-number, life-cycle model has identified a stochastic resonance of about half of the 6.2 yr cycle. The stochastic resonance shows that fluctuation of the stock number is a natural adaptation to the environment and a strategy for optimal growth and survival in the long run. In this stochastic resonance timing between the stock number fluctuation and the 6.2 yr cycle is most important.

Keywords: capelin ecology; capelin model; capelin management; stochastic resonance; 18.6 yr lunar nodal tide

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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