The thermal limits of cardiorespiratory performance in anadromous Arctic char (): a field-based investigation using a remote mobile laboratory.

Despite immense concern over amplified warming in the Arctic, physiological research to address related conservation issues for valuable cold-adapted fish, such as the Arctic char (), is lacking. This crucial knowledge gap is largely attributable to the practical and logistical challenges of conducting sensitive physiological investigations in remote field settings. Here, we used an innovative, mobile aquatic-research laboratory to assess the effects of temperature on aerobic metabolism and maximum heart rate ( ) of upriver migrating Arctic char in the Kitikmeot region of Nunavut in the central Canadian Arctic.