Grouper Spawning Aggregation (IMAGE) University of Texas at Austin Caption Spawning aggregations like this one, large-scale events where hundreds or thousands of fish gather for several days to mate, are critical to the survival of species like the Nassau grouper. Climate change my affect these events, scientists say. Credit Photo by Alfredo Barroso. 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.