Artificial Light and Fish Counts (IMAGE) University of Delaware Caption UD Prof. Jonathan Cohen is a co-author of a new study looking at how artificial light during the polar night disrupts Arctic fish and zooplankton behavior down to 200 meters in depth, which could affect fish counts. Cohen said that research vessels during the Arctic polar night are like Christmas trees illuminated in the middle of the dark ocean. Credit Photo by Michael O. Snyder Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.