Rockfish specimen (IMAGE) University of Washington Caption This copper rockfish (Sebastes caurinus) was collected in 1964 in Puget Sound. The study included eight fish species and found a dramatic decline in the number of parasites over time. Credit Natalie Mastick/University of Washington Usage Restrictions With credit License Original 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.