Observations of cod behaviour reveal insights into the function and properties of the swimbladder under pressure ...

• Main Authors: van der Kooij, Jeroen, Righton, David, Michalsen, Kathrine, Thorsteinsson, Vilhjalmur, Svedang, Henrik, Neat, Francis
• Format: Conference Object
• Language: unknown
• Published: ASC 2006 - Theme session Q 2024
• Subjects: Fisheries and aquaculture; Technologies and data; Gadus morhua; North Atlantic
• Online Access: https://dx.doi.org/10.17895/ices.pub.25259203; https://ices-library.figshare.com/articles/conference_contribution/Observations_of_cod_behaviour_reveal_insights_into_the_function_and_properties_of_the_swimbladder_under_pressure/25259203

No abstracts are to be cited without prior reference to the author.Atlantic cod (Gadus morhua L.) is a highly adaptive boreal species with a broad distribution through different ecosystems in the North Atlantic. Diet, environmental factors and population dynamics vary enormously throughout this range, and behaviours are therefore extremely plastic. However, the behaviour of cod will always be constrained by physiology, be it temperature tolerance, swimming speeds or buoyancy control. Cod, like other gadoids, are physoclists, i.e. they have a closed compliant swimbladder that can be filled or emptied in order to achieve neutral buoyancy at any depth. Pressure changes caused by vertical movements lead to expansion and compression of the swimbladder as individuals ascend or descend respectively. Over time, changes in the volume of the swimbladder will occur so that individuals can maintain neutral buoyancy with the minimum effort. Here, we have used data collected by cod tagged with electronic tags and released ...