Fish Fin Stories (image) University of Illinois at Urbana-Champaign Share Print E-Mail Caption The pigment melanin contributes to the black edges (b) on the anal fin that are a sign of dominance, while pterins account for the red and yellow colors (a) on the anal fin, and signal health. Carotenoids on the caudal fin (c) indicate that the fish is eating well. Brighter, more-intense colors are associated with better mating success. Credit L. Brian Stauffer Usage Restrictions Image may be used only to accompany stories about the research described in this release. Please credit: L. Brian Stauffer. Share Print E-Mail 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.