ইলিশ মাছের পটকা আছে কি?

Yes, the air bladder (also known as the swim bladder) is found in Tenualosa ilisha, commonly known as hilsa.
The swim bladder is an internal gas-filled organ that helps fish maintain buoyancy and control their position in the water column. In hilsa, as with most fish, the swim bladder plays a crucial role in maintaining buoyancy, allowing the fish to stay at various depths without expending too much energy.
The swim bladder also serves some other important functions in fish, including:

1. Sound production and reception: In some species, the swim bladder is involved in hearing and sound production.
2. Regulation of buoyancy: The fish can adjust the amount of gas in the swim bladder to rise or sink in the water.

In hilsa (Tenualosa ilisha), the swim bladder is a critical adaptation for life in its environment, as the species migrates between freshwater and brackish waters in the rivers and estuaries of the South Asian region.