Here also is the link to some of the cool sounds fish make, including the "Barry White of the sea", the black drum.
And one more link: this one describing research by SFSU professor Roger Bland on the vocalizations of the toadfish in SF Bay.
And one more thing about swim bladders.... Some people eat them. From Wikipedia: "In some Asian cultures, the swim bladders of certain large fishes are considered a food delicacy. In China they are known as fish maw, 花膠/鱼鳔, and are served in soups or stews. Swim bladders are also used in the food industry as a source of collagen. They can be made into a strong, water-resistant glue, or used to make isinglass for the clarification of beer.
Melaka shopping mall"