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Updated: Apr 28, 2026

Thermal Limits Determination for Zooplankton Using a Heat Block
Published on: November 18, 2022
Upper thermal tolerance differs between populations of a cyprinid fish, Pseudaspius sachalinensis
Taihei Yamada1, Takaya Hatano1, Daisuke Togaki2
1Department of Applied Aquabiology, National Fisheries University, Japan Fisheries Research and Education Agency, Shimonoseki, Yamaguchi, Japan.
None:
Understanding intraspecific variation in upper thermal tolerance is essential for assessing climate change impacts on freshwater fish communities. We experimentally evaluated thermal tolerance in a cyprinid fish, Pseudaspius sachalinensis, using critical thermal maximum (CTmax) measurements. Fish were collected from two tributaries in Hokkaido, Japan, differing in thermal variability but with similar mean temperatures. The population experiencing greater thermal fluctuations exhibited significantly higher CTmax, whereas individual-level factors (body size and condition) had no detectable effect. These findings highlight the importance of population-specific conservation strategies under climate change.
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