Blue Crab Tags (IMAGE) Smithsonian Caption To estimate recreational versus commercial crabbing, biologists outfitted crabs with these pink tags, offering a reward to crabbers who found them and reported the catch. Credit Kim Richie, Smithsonian Environmental Research Center Usage Restrictions This photo may be used by media outlets free of charge, in keeping with the Smithsonian's Terms of Use (https://www.si.edu/termsofuse), provided credit is given as indicated in the photo information. 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.