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Night lighting affects fish behavior

01.10.2018

Scientists have found that light pollution makes some animal species more daring than nature intended.

In Germany, they conducted an experiment that proved that artificial night lighting affects the behavior of fish. For a 10-week study, scientists selected 90 guppies, dividing them into three equal groups. The first group lived at night in the dark, the second - by the light of a night lamp, the third - in bright light, imitating the midday sun. Then the experts observed the behavior of the fish every day for three weeks.

It was found that guppies that lived with additional lighting swam out of their shelter faster and spent more time in open space. Consequently, the fish showed an uncharacteristic risk appetite and became more vulnerable to predators.

Researchers attribute this behavioral disorder to the stress experienced by guppies. No other disturbances in the behavior of the fish were found.

Scientists promise to continue research on the effect of additional lighting on representatives of the fauna. It is already known that it can throw migratory birds off course, and the trees in the city wake up from winter earlier than in areas without artificial light.

In addition, experts recently noted that many nocturnal predators began to look for prey during the day. This is also associated with the stress that animals experience due to human activities.

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