Abstract:

Climate change poses significant challenges to aquatic ecosystems, particularly affecting ectothermic organisms like fish. Understanding the behavioural responses of fish to rising temperatures is crucial for predicting their survival in changing environments and the effects of climate change. This study aimed to investigate the effects of heat stress on fathead minnow (Pimephales promelas) behaviour, focusing on activity levels, tank location activity, and foraging behaviour. Ninety fathead minnows were subjected to heat stress in a controlled laboratory setting. Behavioural trials were conducted using GoPro cameras to observe fish responses to temperature-induced stressors. Water quality parameters were monitored to ensure optimal conditions throughout the experiment. The analysis revealed significant differences between control and elevated temperature groups in activity levels, tank location activity, and foraging behaviour. Elevated temperatures prompted increased overall activity and altered spatial preferences, with fish displaying bolder behaviours. Furthermore, fish subjected to heat stress exhibited prolonged foraging durations, indicating potential challenges in food acquisition and maintenance. These findings demonstrate that heat stress significantly influences fathead minnow behaviour, highlighting the importance of temperature regulation in aquatic habitats.