Environmental Biology of Fishes

, Volume 75, Issue 2, pp 183–193 | Cite as

Thermal Tolerance of Diploid Versus Triploid Rainbow Trout and Brook Trout Assessed by Time to Chronic Lethal Maximum

  • Peter F. Galbreath
  • Nathan D. Adams
  • Lee. W. SherrillIII
  • Thomas H. Martin


An effect of ploidy on thermal tolerance in juvenile trout was assessed in a series of tests comparing time to chronic lethal maximum (CLMax). Diploid and triploid fish were produced from a common spawn for three different groups each of brook trout Salvelinus  fontinalis and of rainbow trout Oncorhynchus  mykiss. One or two CLMax tests were performed per group, on between 15 and 50 individuals per ploidy within groups. The tests involved exposure of fish to a progressive 2°C day−1 water temperature increase and recording of the time at which each individual fish reached loss of equilibrium (LE). The time to LE data were rank transformed and analyzed as a randomized complete block design. Although relative performance varied among trials, the analysis indicated overall differences due to ploidy were small and nonsignificant among both brook trout and rainbow trout. Size proved to be significantly correlated with time to LE in the brook trout trials, but not in the rainbow trout trials. Two of the six groups included a large proportion of fish which had received a heat shock following fertilization, but were not successfully triploidized. In both cases, thermal tolerance of the heat-shocked diploids was similar to that of the non-heat shocked control diploids, indicating no persistent effect of the heat shock on thermal tolerance.


ploidy triploidy critical thermal maximum brook charr 


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Copyright information

© Springer 2006

Authors and Affiliations

  • Peter F. Galbreath
    • 1
    • 3
  • Nathan D. Adams
    • 1
  • Lee. W. SherrillIII
    • 1
  • Thomas H. Martin
    • 2
  1. 1.Mountain Aquaculture Research CenterWestern Carolina UniversityCullowheeUSA
  2. 2.Department of BiologyWestern Carolina UniversityCullowheeUSA
  3. 3.Columbia River Inter-Tribal Fish CommissionPortlandUSA

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