Night lighting changes the behavior of fish

Light pollution can disrupt biological rhythms and interfere with the life of flora and fauna. For example, because of urban lights, migratory birds are off course, and the trees start spring awakening too early. In a new study, German scientists looked at how night lighting affects fish.

Three groups of guppy fish, 30 for each 10 weeks, were placed in different lighting conditions: bright, weak and complete darkness. During the experiment, scientists checked how the fish behave in such conditions during the day.

According to the results of the study, individuals who were under weak and bright light, quickly selected from the shelter and stayed longer in an open aquarium. According to scientists, night lighting caused stress in fish and made them more prone to risks. The consequence of this behavior may be vulnerability to predators.