Recruitment of stock of deepwater redfish <Emphasis Type="Italic">Sebastes mentella</Emphasis> (Scorpaeniformes,Scorpaenidae) in the pelagial of the Irminger Sea and adjacent waters |
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Authors: | S P Melnikov Yu I Bakai |
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Institution: | 1.Polar Research Institute of Marine Fishery and Oceanography (PINRO),Murmansk,Russia |
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Abstract: | Results of comparative analysis of several ecologo-populational characteristics and fauna of parasites of deepwater redfish
Sebastes mentella from the pelagial of the Irminger Sea and slopes of Greenland are provided. It was established that the nursery area of the
species in this part of the northern Atlantic is located in the shelf and shallow-water sites of the Greenland slopes. Near
the nursery area, at deepwater sites of the Greenland slope, aggregations of mainly immature specimens (68–86%) with an average
length of 35–38 cm are located, and, in the oceanic pelagial, there are mainly mature specimens (91–95%) with a length of
more than 30 cm. Considerable similarity and specific features of fauna of parasites of S. mentella from the southeastern slope of Greenland and the pelagial of the Irminger Sea indicate the belonging of fish aggregations
in these areas to a single intraspecies group and the migration of maturing specimens from the slope to the pelagial. A conclusion
is made that the aggregations of S. mentella in the pelagial of the Irminger and Labrador seas represent a pelagic ecological group formed by rapidly maturing specimens;
a near-bottom ecological group at deepwater sites of the slope of Greenland is formed by slowly maturing specimens. No mass
migration of the redfish from deepwater areas to shallow sites of the slope and to the oceanic pelagial of the northern Atlantic
was recorded. |
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