1. Respiration: Crackers contain oxygen. Fish carry out respiration with the help of this oxygen.
2. Sound Production: Crackers help in sound production. Vibration occurs when air is trapped in the diaphragm wall of the crack.
3. Echo generation: Crackers generate sound waves. These sound waves reach the cochlea through the Becherian tube.
4. Buoyancy: The air trapped in the crackers helps the fish to float in the water.
5. Relative weight control: Crackers control relative weight by increasing or decreasing the amount of gas inside the body.
6. Hearing: Crackers help the fish to hear.
7. Protecting the center of gravity: The gas on one side of the air bag is transferred to the other side and protects the center of gravity of the body in water. Siddique Publications
8. Adaptation: At any depth of water, the size of the alveoli changes to suit the environment. As a result, fish swim actively at any depth and adapt. Siddique Publications