Life under pressure: insights from electronic data-storage tags into cod swimbladder function

• DOI: 10.1093/icesjms/fsm119
• Publication Date: 2007-09-01T00:44:59Z
• Authors: Jeroen van der Kooij; David Righton; Espen Strand; Kathrine Michalsen; Vilhjalmur Thorst...; Henrik Svedäng; Francis C. Neat; Stefan Neuenfeldt
• Keywords: Demersal zone; Descent (aeronautics); Research vessel; Demersal fish

Abstract van der Kooij, J., Righton, D., Strand, E., Michalsen, K., Thorsteinsson, V., Svedäng, H., Neat, F. C., and Neuenfeldt, S. 2007. Life under pressure: insights from electronic data-storage tags into cod swimbladder function. – ICES Journal of Marine Science. 64: 1293–1301. The behavioural response (Gadus morhua) to sudden pressure reductions was investigated in a large electronic-tagging experiment using data collected 141 tagged five different areas the Northeast Atlantic. More than 40% exhibited characteristic equilibration behaviour after rapid reduction caused either by capture before tagging, or during ascent seabed, when migrating deeper water. allowed regain demersal residence. rate descent averaged 10 m d−1 (ranging 2 23 d−1) over periods less day 1 month. Descent rates for on Icelandic shelf were inversely related fish length, i.e. smaller descended more rapidly, findings consistent with results achieved past laboratory conditions. Modelling volume suggested that negatively buoyant most time. imply functionality is retained probable barotrauma would follow ascent, gas exchange may be naturally variable. These have implications assumptions discard mortality, interpretation behaviour, its impact biomass estimates obtained acoustic surveys.