Toadfish (Opsanus tao) (image) Marine Biological Laboratory Share Print E-Mail Caption The toadfish (Opsanus tao) is a model organism used to study hearing, balance, and synaptic transmission. Credit Stephen Highstein, MBL Usage Restrictions Please use with credit. 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.