Mudskipper can breathe on land as well as in the water. They adsorb oxygen through skin and gill chambers.

Mudskippers are found only in mangrove areas in South East Asia, South East China, Southern Japan, Northern Australia and the Pacific regions.

Swim bladder or air bladder is an internal organ possessed by most bony fish. It is a tube or a bag of gas (usually oxygen) that helps fish float.

Not all fishes have a swim bladder. Sharks, for example, do not have a swim bladder.

The swim bladder also produces sound by vibrating. However, these sounds can only be heard by another fish.