Canadian Journal of Zoology, Journal Year: 2025, Volume and Issue: 103, P. 1 - 8
Published: Jan. 1, 2025
Fish often show behavioural responses to elevated water temperature before they reach their upper thermal limit. We measured the activity, aggression, and tolerance (critical maximum, CT max ; agitation temperature, T ag window; safety margin) of Bluntnose Minnow ( Pimephales notatus Rafinesque, 1820). Thirty fish underwent a 5-week acclimation period two temperatures (ambient, 16 °C or hot, 25 °C). took observations throughout 5 weeks conducted trials at end period. Aggression was marginally higher in acclimated hot water, but there no change over time (week 1 5). Activity treatment, again activity time. found that , window (the difference between ) were significantly greater °C, margin smaller. This study highlights significance may occur well critical limit, which result negative physiological (metabolic costs) (avoidance/refuge seeking behaviour) impacts
Language: Английский