Estimating migration patterns of fish from otolith chemical composition time-series

Christoffer Moesgaard Albertsen, Karin Hüssy, Simon Hansen Serre, Jakob Hemmer Hansen, Tonny Bernt Thomsen

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Abstract

Understanding migration patterns and habitat use is of great importance for management and conservation of marine living resources. The chemical composition of otoliths is influenced by the surrounding environment; therefore, they are indispensable data archives. To extract migration patterns and historical habitat use of individual fish, we analyse otolith chemical compositions obtained by laser ablation inductively coupled plasma mass spectrometry by a regime-switching state-space model. The state-space model filters the measurement noise from the environmental signal. In turn, the filtered signal is converted to geographical positions through a calibration of strontium to salinity. The method is validated by a simulation study and applied to 404 Atlantic cod otoliths.
Original languageEnglish
JournalCanadian Journal of Fisheries and Aquatic Sciences
ISSN0706-652X
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Habitat use
  • Microchemistry
  • Movement
  • Otolith
  • State-space model
  • Strontium

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