scholarly journals Assessing the Thermal Tolerance and Growth Potential at Elevated Temperatures of Three Different Strains of Rainbow Trout (Oncorhynchus mykiss)

2012 ◽  
Author(s):  
Michael A. Porto
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Thermal Tolerance ◽  
Elevated Temperatures ◽  
Growth Potential ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Different Strains

scholarly journals Selection for upper thermal tolerance in rainbow trout (Oncorhynchus mykiss Walbaum)

2015 ◽  
Vol 218 (5) ◽  
pp. 803-812 ◽  
Author(s):  
Z. Chen ◽  
M. Snow ◽  
C. S. Lawrence ◽  
A. R. Church ◽  
S. R. Narum ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Thermal Tolerance ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Selection For ◽  
Upper Thermal Tolerance

Determination of thermal tolerance in rainbow trout Oncorhynchus mykiss based on effective time, and its reproducibility for a large number of fish

2020 ◽  
Vol 86 (5) ◽  
pp. 767-774
Author(s):  
Toshinao Ineno ◽  
Kazuya Yamada ◽  
Koichi Tamaki ◽  
Ryusuke Kodama ◽  
Engkong Tan ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Thermal Tolerance ◽  
Effective Time ◽  
Rainbow Trout Oncorhynchus Mykiss

scholarly journals Elevated cortisol lowers thermal tolerance but results in limited cardiac remodelling in rainbow trout (Oncorhynchus mykiss) experiencing chronic social stress

2021 ◽  
Author(s):  
Brittany Bard ◽  
Annette Dodge ◽  
William Joyce ◽  
Michael Lawrence ◽  
Steven J Cooke ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Social Stress ◽  
Thermal Tolerance ◽  
Cardiac Remodelling ◽  
Type I ◽  
Chronic Social Stress ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Dominant Fish ◽  
Cortisol Levels

Juvenile rainbow trout (Oncorhynchus mykiss) held in pairs form dominance hierarchies in which subordinate individuals experience chronic social stress accompanied by lowered thermal tolerance (assessed as the critical thermal maximum, CTmax). Here we tested the hypothesis that chronic elevation of circulating cortisol levels reduces thermal tolerance in subordinate trout. In support of this hypothesis, subordinate trout that recovered from social stress for 48 h, a period sufficient to return cortisol to normal baseline levels, no longer showed reduced CTmax. Further, thermal tolerance was not restored in subordinates treated with cortisol during recovery from social stress. To explore possible mechanisms underlying the effect of chronic stress on CTmax, we also tested the hypothesis that chronic cortisol elevation induces cardiac remodelling in subordinate trout, as previously reported for cortisol-treated rainbow trout. Ventricle mass and cardiac hypertrophy markers were unaffected by social stress. Picrosirius red staining revealed a trend for lower collagen levels in the ventricles of subordinate relative to dominant trout. However, collagen type I transcript and protein levels, and markers of collagen turnover were unaffected. Indicators of cardiac function, including ventricle passive stiffness and intrinsic heart rate (fH), similarly were unaffected. In vivo fH was also similar between subordinate and dominant fish. Nevertheless, in keeping with their lower CTmax, subordinate fish exhibited cardiac arrhythmia at significantly lower temperatures than dominant fish during CTmax trials. Thus, high baseline cortisol levels in subordinate trout result in lowered thermal tolerance, but 5 d of social stress did not greatly affect cardiac structure and function.

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