Perch on ice (IMAGE) University of Helsinki Caption Mercury concentration in fish muscle is higher in winter and near spring spawning and lowest in autumn after the growing season Credit Kimmo Kahilainen Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.