Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Decreased Body Temperature01:29

Decreased Body Temperature

893
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
893
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

14.5K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
14.5K
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

7.3K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
7.3K
Factors Influencing Microbial Growth: Temperature01:27

Factors Influencing Microbial Growth: Temperature

935
Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
935

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same authorSame journal

Thermal tolerance and acclimation limits in bull trout (Salvelinus confluentus) alevin.

Journal of fish biology·2026
Same author

High kinship and runs of homozygosity characterize walleye Sander vitreus metapopulation diversity in Lake Champlain, USA.

BMC ecology and evolution·2026
Same author

Microplastic exposure induces locomotory responses in wood frog (Rana sylvatica) tadpoles.

Ecotoxicology (London, England)·2026
Same author

High-throughput multispecies quantitative polymerase chain reaction assays to study the effects of acute thermal stress in three species of Acipenser sturgeon.

Journal of fish biology·2026
Same author

Re-Evaluating Hot Mitochondria: Too Slow to Cool.

Acta physiologica (Oxford, England)·2026
Same author

Conservation physiology of freshwater fishes: an illustration of pressing questions and implications for management.

Conservation physiology·2025

Related Experiment Video

Updated: Dec 20, 2025

Thermal Limits Determination for Zooplankton Using a Heat Block
07:16

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

1.7K

Sub-lethal temperature thresholds indicate acclimation and physiological limits in brook trout Salvelinus fontinalis.

Scott M Morrison1, Theresa E Mackey2, Travis Durhack1,3

  • 1Department of Biological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.

Journal of Fish Biology
|May 25, 2020
PubMed
Summary

Brook trout (Salvelinus fontinalis) upper thermal tolerance shows a critical thermal maximum (CTmax) that plateaus at higher acclimation temperatures. Above 20-23°C, brook trout experience reduced physiological performance and increased metabolic costs.

Keywords:
body conditioncritical thermal maximafishhepato-somatic indexlactateosmolality

More Related Videos

Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri
09:43

Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri

Published on: April 24, 2018

7.9K
Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Published on: March 9, 2021

3.3K

Related Experiment Videos

Last Updated: Dec 20, 2025

Thermal Limits Determination for Zooplankton Using a Heat Block
07:16

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

1.7K
Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri
09:43

Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri

Published on: April 24, 2018

7.9K
Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Published on: March 9, 2021

3.3K

Area of Science:

  • Aquatic Ecology
  • Fish Physiology
  • Climate Change Biology

Background:

  • Brook trout (Salvelinus fontinalis) are sensitive to temperature changes.
  • Rising water temperatures due to climate change pose a threat to cold-water fish species.
  • Understanding thermal tolerance limits is crucial for conservation efforts.

Purpose of the Study:

  • To determine the upper thermal tolerance of brook trout.
  • To identify critical thermal maxima (CTmax) across a range of acclimation temperatures.
  • To investigate physiological indicators of thermal stress in brook trout.

Main Methods:

  • Brook trout were acclimated to temperatures ranging from 5-25°C.
  • Critical thermal maxima (CTmax) experiments were conducted.
  • Plasma lactate levels and hepato-somatic index (IH) were measured as indicators of metabolic stress.

Main Results:

  • CTmax increased with acclimation temperature but plateaued at 20-25°C.
  • Elevated plasma lactate and reduced hepato-somatic index were observed at 23-25°C.
  • A sub-lethal threshold for reduced physiological performance was identified between 20°C and 23°C.

Conclusions:

  • Brook trout exhibit a thermal tolerance plateau, indicating limited capacity to adapt to higher temperatures.
  • Temperatures between 20°C and 23°C represent a critical threshold impacting brook trout physiology.
  • These findings highlight the vulnerability of brook trout to warming aquatic environments.