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Journal of Fish Biology (2002) 60, 117133 doi:10.1006/jfbi.2001.1815, available online at http://www.idealibrary.com on
 

Summary: Journal of Fish Biology (2002) 60, 117­133
doi:10.1006/jfbi.2001.1815, available online at http://www.idealibrary.com on
In vitro cardiac performance in triploid brown trout at two
acclimation temperatures
C. MERCIER*, M. AXELSSON, N. IMBERT, G. CLAIREAUX,
C. LEFRANC¸OIS, J. ALTIMIRAS AND A. P. FARRELL¶§
*LBEM, Institut de la Mer et du Littoral, Avenue Lazaret, 17 000, La Rochelle, France,
CREMA-L'Houmeau, Place du Se´minaire, BP5, L'Houmeau 17137, France,
Department of Zoology, University of Go¨teborg, Box 463, 40530 Go¨teborg, Sweden and
¶Department of Biological Sciences, Simon Fraser University, Burnaby, BC, V5A 1S6,
Canada
(Received 1 May 2001, Accepted 21 October 2001)
The maximum values for heart rate (fH), stroke volume (VH), cardiac output (Q) and
myocardial power output, measured in vitro with a perfused heart preparation, as well as the
isometric force-frequency relationship for atrial and ventricular muscle strips, in triploid brown
trout Salmo trutta were all comparable with established information for diploid rainbow trout
Oncorhynchus mykiss. Therefore, it was concluded that triploidy is not associated with a major
deficiency in maximum cardiac performance. However, a heightened sensitivity to ryanodine
was discovered, which indicated an enhanced role for the sarcoplasmic reticulum in excitation-
contraction coupling in these triploid fish. It is suspected that the enhanced role of the

  

Source: Altimiras, Jordi - Department of Biology, Linköpings Universitet
Farrell, Anthony P. - Faculty of Land and Food Systems, University of British Columbia

 

Collections: Biology and Medicine; Environmental Sciences and Ecology