Experience of using temperature-acoustic transects from international ecosystem surveys for analysis of pelagic fish distribution in the Norwegian Sea
Abstract
The results of the analysis of combined vertical transects with temperature and the acoustic nautical area scattering coefficients (acoustic values) distribution for herring and blue whiting are presented in the paper. The data were obtained on transects during summer pelagic surveys 2011–2017. The accumulated experience has made it possible to compare the spatial and vertical distribution of pelagic fish under different oceanographic conditions. Some climatic features of concentrations of fish of different age groups are revealed. It is shown that blue whiting is concentrated in the eastern part of the Norwegian Sea mainly over the continental shelf slope and in the high temperature gradient area in the layer 200–300 m within the warm side of the thermal frontal zone. In the summer feeding period, the largest schools of Atlanto-Scandian herring are observed in the western part of the sea in a wide range of depth and temperature. There is a shift of frontal zones eastward or westward, which significantly affects the distribution of blue whiting. For herring, in contrast to blue whiting, the shifting of the frontal zones is less important than large-scale processes forming migration routes which depend from environmental conditions, age access and availability of feed.
About the Author
E. V. Sentyabov
N. M. Knipovich Polar Research Institute of Marine Fisheries and Oceanography (FSBSI «PINRO»)
Russian Federation
Russian Federation
Murmansk
References
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Review
For citations:
Sentyabov E.V. Experience of using temperature-acoustic transects from international ecosystem surveys for analysis of pelagic fish distribution in the Norwegian Sea. Trudy VNIRO. 2018;174:105-111. (In Russ.)
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