Gustavo Castellanos_Miraflores Locks_Leila Nilipour.jpg (IMAGE) Smithsonian Tropical Research Institute Caption Gustavo Castellanos-Galindo in a pool of water formed during draining of the Panama Canal locks for cleaning. He will catch fish in the locks to better understand what fish species are in the freshwater coming from Lake Gatun. Credit Leila Nilipour, Smithsonian Tropical Research Institute Usage Restrictions Credit: Smithsonian Tropical Research Institute 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.