DataSheet_1_Space-time recapture dynamics of PIT-tagged Northeast Atlantic mackerel (Scomber scombrus) reveal size-dependent migratory behaviour.docx

• Main Authors: Kotaro Ono, Aril Slotte, Sondre Hølleland, Steven Mackinson, Sigurður Þór Jónsson, Jan Arge Jacobsen, Anna Heiða Ólafsdóttir
• Format: Dataset
• Language: unknown
• Published: 2022
• Subjects: Oceanography; Marine Biology; Marine Geoscience; Biological Oceanography; Chemical Oceanography; Physical Oceanography; Marine Engineering; Atlantic mackerel; size-dependent migration; GIS; semi-parametric model; PIT tag; tag-recapture; Greenland; Greenland Sea; Northeast Atlantic; Norwegian Sea
• Online Access: https://doi.org/10.3389/fmars.2022.983962.s001; https://figshare.com/articles/dataset/DataSheet_1_Space-time_recapture_dynamics_of_PIT-tagged_Northeast_Atlantic_mackerel_Scomber_scombrus_reveal_size-dependent_migratory_behaviour_docx/21541305

Based on GIS-mapping and semi-parametric modelling of recaptures from PIT-tag experiments in the North Sea nursery area (September 2011), the Celtic Seas spawning area (May-June 2014-2021) and the Icelandic Waters feeding area (August 2015-2019), we argue that the distribution of Northeast Atlantic (NEA) mackerel is influenced by a size-dependent migratory behaviour. The time-space recapture dynamics revealed that larger mackerel tended to migrate a longer distance between spawning and feeding areas, either through a western route from the Celtic Seas into the Icelandic Waters and the Greenland Sea or by following the main route northwards through the Faroe-Shetland Channel into the Norwegian Sea. This long-distance travel resulted in turn in delayed arrival in the North Sea wintering area. During the return spawning migration into the Celtic Seas, larger individuals remained in the front, likely heading to spawning grounds farther south than smaller conspecifics. Migration patterns also evolved with time at liberty as the mackerel grew older and larger, while possibly covering a progressively wider area over its annual migration cycle as suggested from the tagging data. However, the study also showed large inter-annual variability in the recapture patterns which likely reflect changes in environmental condition (prey availability and ocean current), NEA mackerel population demographics, and the spatial fishery dynamics.