Schooling dynamics of Northeast Atlantic mackerel (Scomber scombrus) in the Norwegian Sea using multibeam sonar ...
No abstracts are to be cited without prior reference to the author. Pelagic fish in the Norwegian Sea perform seasonal migrations from overwintering, via spawning, to feeding grounds. Northeast Atlantic mackerel (Scomber scombrus) are highly migratory, fast-swimming, and an obligate schooling fish....
| Main Authors: | , , , , |
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| Format: | Conference Object |
| Language: | unknown |
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ASC 2013 - Theme session N
2024
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.17895/ices.pub.24753858.v1 https://ices-library.figshare.com/articles/conference_contribution/Schooling_dynamics_of_Northeast_Atlantic_mackerel_Scomber_scombrus_in_the_Norwegian_Sea_using_multibeam_sonar/24753858/1 |
| Summary: | No abstracts are to be cited without prior reference to the author. Pelagic fish in the Norwegian Sea perform seasonal migrations from overwintering, via spawning, to feeding grounds. Northeast Atlantic mackerel (Scomber scombrus) are highly migratory, fast-swimming, and an obligate schooling fish. Mackerel schooling dynamics in nature is unknown because they lack a swimbladder, resulting in a weak acoustic signature, and therefore are difficult to detect in the summer when in loose schools. However, high frequency omnidirectional SONAR is capable of detecting mackerel in the acoustic echosounder blind zone close to the surface. Mackerel schooling dynamics were studied in relation to temperature, zooplankton abundance and density of conspecifics in four geographically separate regions of the Norwegian Sea during summer. The thermocline depth had a profound influence on the depth distribution of schools. Mackerel were found shallower than 40 m depth where the temperature was at least 6° C. The fish generally ... |
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