Dolly Varden in Spawning Colors (image) University of Washington Share Print E-Mail Caption The color of Dolly Varden trout, this one a 16-inch (40-centimeter) adult, deepens when it's time to spawn. Credit M Bond/U of Washington Usage Restrictions Credit required. No commercial use. 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.