Structure and specific features of formation of aggregations of deepwater redfish <Emphasis Type="Italic">Sebastes mentella</Emphasis> (Scorpaenidae) in the Norwegian Sea pelagial |
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Authors: | S P Melnikov K V Drevetnyak |
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Institution: | 1.Knipowich Polar Research Institute of Marine Fish Fisheries and Oceanography (PINRO),Murmansk,Russia |
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Abstract: | Results of studies of the structure and specific features of formation of aggregations of deepwater redfish Sebastes mentella in the Norwegian Sea pelagial are provided. Data on the biological characteristics of S. mentella from different regions of the Norwegian Sea pelagial do not allow us to consider its aggregations as separate populations.
On the basis of comparative analysis of the structure of aggregations in the Norwegian Sea and of population parameters and
specific features of the life cycle of S. mentella in different parts of the Atlantic Ocean, its complex intraspecies organization at sites of overlapping of two largest populations—North
Atlantic and Norwegian-Barents Sea-was established. The formation of pelagic aggregations in the water area of the Norwegian
Sea occurs due to migration of maturing and mature individuals from the adjoining water areas. In the southern areas of the
Norwegian Sea, dominant recruitment comes from the pelagial of the northeastern part of the Irminger Sea, which is promoted
by the direction of streams of the North-Atlantic Current; it is not excluded either that fish can migrate to the southern
part of the sea from the slopes of the Faeroes, Faeroes-Icelandic threshold, and the western coast of Norway. Migration to
the northern areas of the sea is mainly performed by rapidly maturing fish from the rearing region from the western slopes
of the Barents Sea and Spitsbergen Archipelago. The presence of seasonal migrations hinders the formation in the pelagial
of perch isolated groups and promotes their migration. |
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