As the world gets brighter, it could get a lot harder to find baby clownfish like Nemo. In a new study, published in Biology Letters, researchers exposed clownfish to artificial light to simulate light pollution. The experiment included 10 clownfish pairs, half of which were placed in aquariums that had low levels of light shone on them all night. These fish continued to spawn and fertilize their eggs, but none of them hatched, National Geographic reports. Scientists have already documented other ways that light pollution can disrupt marine ecosystems, but the clownfish researchers say the “zero survivorship” results demonstrate just how devastating it could be for certain sea creatures.