DAO 111:87-92 (2014)  -  DOI: https://doi.org/10.3354/dao02779

NOTE
Aplasia of the septum transversum has no effect on plasma biochemistry following an acute hypoxic event in Atlantic salmon

Thomas W. K. Fraser1,*, Per Gunnar Fjelldal2, Tom J. Hansen2, Frode Oppedal2, Rolf Erik Olsen2,3, Tone Vågseth2, Mette Remen

1Department of Production Animal Clinical Sciences, Norwegian School of Veterinary Science, 0033 Oslo, Norway
2Institute of Marine Research, Matre Research Station, 5984 Matredal, Norway
3Norwegian University of Science and Technology, Department of Biology, 7491 Trondheim, Norway
*Corresponding author:

ABSTRACT: Aplasia of the septum transversum (AST) is a malformation that results in alterations in ventricle morphology. The condition has been linked to increased mortality during periods of increased cardiac demand in Atlantic salmon Salmo salar. The blood plasma biochemical response to an acute hypoxic event (1 h at 31-39% O2 saturation) was investigated in fish with and without a septum transversum to assess levels of anaerobic respiration (lactate) and the stress response (cortisol, glucose, osmolality, Na+, Cl- and K+). AST had no effect on body size parameters or relative ventricular mass. The hypoxic event increased the levels of anaerobic respiration and induced a typical stress response. Contrary to our expectations, AST had no effect on any plasma parameter in normoxia or following severe acute hypoxia. We conclude that in the current scenario, AST does not affect the levels of anaerobic respiration or the plasma stress response in Atlantic salmon.


KEY WORDS: Aquaculture · Fish welfare · Heart · Stress · Cardiovascular · Hypoxia · Oxygen saturation · Salmo salar


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Cite this article as: Fraser TWK, Fjelldal PG, Hansen TJ, Oppedal F, Olsen RE, Vågseth T, Remen M (2014) Aplasia of the septum transversum has no effect on plasma biochemistry following an acute hypoxic event in Atlantic salmon. Dis Aquat Org 111:87-92. https://doi.org/10.3354/dao02779

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