Bright orange clownfish, of Finding Nemo fame, face a slew of problems in the wild, from overharvesting for home aquaria, to bleaching of their coral and anemone homes by climate change-induced warming waters. And now there’s a third prong on this deadly trident: light pollution.

Published today in Biology Letters, a new study reveals that clownfish, which are dependent on coral reefs, can’t raise any young when exposed to artificial light.

The human-made light that is spewed over Earth endangers animals across ecosystems. Nighttime lights alter birds’ nocturnal migrations. Plants bloom earlier. Sea turtles avoid nesting on brightly-lit beaches. Songbirds start warbling earlier.

“But we don’t think about underwater marine systems being potentially impacted,” says Emily Fobert,