Eastern Brook Trout (IMAGE) University of Massachusetts Amherst Caption The authors spent years sampling four streams and tracking more than 15,000 individual fish, but now feel they can account for about 90 percent of the yearly variation in abundance of Eastern brook trout. High summer air temperatures are important in survival of small fry and eggs. Credit UMass Amherst 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.