Journal
FISHERIES RESEARCH
Volume 162, Issue -, Pages 48-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fishres.2014.09.003
Keywords
Stomach temperature; Diel vertical migration; Shortfin mako; Porbeagle shark; Irregular post-release behavior
Categories
Funding
- Irish government
- European Union under Irish National Development Plan
- Basque Government [IM13Markak, ATM2010040]
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Three out of eight albacore (Thunnus alalunga) tagged with pop-up satellite archival tags (PSATs) in the greater Bay of Biscay area of the North East Atlantic were predated as indicated by missing light level data, sudden increases in temperature, and substantial changes in depth profiles. Recorded stomach temperatures and differences between stomach and ambient water temperatures were consistent with shortfin maim (Isurus oxyrinchus) and porbeagle (Lamna nasus) sharks. Vertical behavior in the form of diel migrations, deep dives and extensive periods spent close to the surface during day and night time was again consistent with Lamnid sharks. The observed predation rate was considered to be elevated due to irregular post-release behavior as opposed to symptomatic of natural mortality. (C) 2014 Elsevier B.V. All rights reserved.
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