Behavioural responses to pressure changes in cultured Atlantic cod (Gadus morhua): Defining practical limits for submerging and lifting sea-cages
Oyvind J Korsoen, Tim Dempster, Jan Erik Fosseidengen, Anders Ferno, Einar Heegaard, Tore S Kristiansen
Aquaculture | ELSEVIER | Published : 2010
Farmed Atlantic cod (Gadus morhua) are occasionally exposed to buoyancy changes in sea-cages, through lifting or lowering of cage nets. Physiological processes regulate the level of gas in the closed swim bladders of cod and thus the ability of cod to control their buoyancy. Rapid net lifting may cause positive buoyancy, leading to barotrauma, while net lowering may lead to negative buoyancy and alter cod behaviours. We tested how groups of farmed cod responded immediately after lifting events from 5 different start depths equivalent to 40% pressure reductions, and how long they took to return to pre-lifting pressure levels. In addition, we tested immediate responses and recovery times to ca..View full abstract
We thank the staff at Austevoll Research Station for assistance with culturing fish, Tone Vagseth for data handling, Espen Strand for buoyancy modelling, and Odd Borre Humborstad and Anders Mangor Jensen for discussions. Funding was provided by SINTEF Fisheries and Aquaculture through the Centre for Research Innovation in Aquaculture Technology (CREATE). The work was conducted in accordance with the laws and regulations controlling experiments and procedures on live animals in Norway following the Norwegian Regulation on Animal Experimentation 1996.