Goliath Grouper (IMAGE) Florida Atlantic University Caption Goliath grouper, one of the largest grouper species reaching up to 800 pounds, produce low frequency loud “booms” using their swim bladder and surrounding muscles. Credit Clark Morgan, the Fisheries Ecology and Conservation Lab at FAU Harbor Branch. Usage Restrictions Credit: Clark Morgan, the Fisheries Ecology and Conservation Lab at FAU Harbor Branch. 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.