Ecological significance of 0-group fish in the Barents Sea ecosystem |
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Authors: | Elena Eriksen Bjarte Bogstad Odd Nakken |
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Institution: | (1) Institute of Marine Research, P.O. Box 1870, Nordnes, 5817 Bergen, Norway |
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Abstract: | Investigations into the 0-group fish in the Barents Sea have been carried out since 1965, with the goal of estimating the
abundance of 0-group fish. 0-group abundance indices have been used in the assessment of the recruitment level and in recruitment
variability studies. However, the ecological importance of the 0-group fish in the Barents Sea has been less studied. Although
0-group capelin, herring, cod and haddock are widely distributed in the Barents Sea, the central area seems to be the most
important, accounting for approximately 50–80% of the annual biomass. The total biomass of the four most abundant 0-group
fish species can be up to 3.3 million tonnes, with an average of 1.3 million tonnes (1993–2009). Wide distribution and high
biomass of pelagically distributed 0-group fish make these fishes an important element in the energy transport between different
trophic levels and different geographical areas, having a critical impact on the entire Barents Sea ecosystem. In recent years,
capelin have shown a pronounced northward shift in biomass distribution, and several successive strong year classes occurred
during warm temperature conditions. Cod biomasses were unexpectedly low during warm years and were positively correlated with
spawning stock biomass, while the correlation with temperature was not significant. Haddock and herring show, as expected, increasing biomass with increased temperature when the spawning stock is at a sufficiently high level. |
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