The oyster toadfish, Opsanus tau, also known as the ugly toad, oyster cracker and “bar dog”, is a fish of the family Batrachoididae. The maximum length of the toadfish is about 38 cm; the most common recorded length of an oyster toadfish is about 30 cm. They are generally yellowish with a pattern of brown diagonal bars. The species can live in very bad conditions and needs little food to live. Common prey includes crustaceans, mollusks, amphipods, squid, and other smaller fish. Toadfish rely upon camouflage to catch their food; they lie motionless waiting for prey to wander close by, and then attack by surprise.
The oyster toadfish inhabits bays, estuaries, and coastal inlets. They can be found anywhere from Maine to the Caribbean Sea.