Fish migration in oscillating stratified water masses ...

• Main Authors: Stensholt, Boonchai K., Høines, Åge, Kasajima, Yoshie
• Format: Conference Object
• Language: unknown
• Published: ASC 2006 - Theme session Q 2024
• Subjects: Fisheries and aquaculture; Technologies and data; Arctic; Barents Sea; Greenland; Norwegian Sea; Arctic cod; Gadus morhua; Northeast Arctic cod
• Online Access: https://dx.doi.org/10.17895/ices.pub.25259221; https://ices-library.figshare.com/articles/conference_contribution/Fish_migration_in_oscillating_stratified_water_masses/25259221

No abstracts are to be cited without prior reference to the author.Time series records from data storage tag (DST) attached on Northeast Arctic cod (Gadus morhua L.) and Greenland halibut (Reinhardtius hippoglossoides) are investigated in connection with hydrodynamic and hydrographic features at specific locations to obtain spatial and temporal variation on fish migration patterns, which may change the availability of fish to survey gears. From spring to autumn, some Greenland halibut, at 500-800 m depth, were exposed to a persistent diurnal fluctuation of temperature between subzero and 5.5C. Tidally induced topographic trapped waves with diurnal (K1) frequency were indicated in some region along the Barents Sea escarpment, where the transition zone between warm Atlantic water (AW) and cold Norwegian Sea Arctic Intermediate Water (NAIW) is at 500-700 m. An asymmetry in the temperature diurnal pattern showed a gradual increase followed by a rapid drop. This event may be related to the displacement mechanism ...