Stoplight Parrotfish (IMAGE) Penn State Caption A stoplight parrotfish feeding on algae. New research shows that selective fishing of large parrotfish can disrupt the balance between corals and algae in embattled Caribbean reefs. Credit Andrew Shantz, Penn State 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.