Effect of Thermal Pollution On Natal Homing (chum Salmon)
Thermal pollution, which refers to the degradation of water quality by changing the ambient water temperature, has a serious effect on natal homing of Chum salmon. Chum salmon is a typical cold water fish that prefer water around 10 degrees Celsius. When water temperature is raised due to thermal pollution, Chum salmon tends to dive into deep water for thermoregulation. This reduces the time Chum salmon spent in surface water column and reduce the chance for Chum salmon to approach natal river since chemical cue for natal homing is concentrated on surface water.
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