Maw debate

After checking numerous websites mainly dealing with the profitable business of exporting fish maw, i found one http://www.ibcbd.net/export.htm that clarifies "Fish Maw: Fish Maw is a super exportable fish food item. The stomach of fish is called Fish Maw. As well as shrimps & other white fish, Bangladesh earns substantial foreign currency exporting fish maw to Thailand, Hong Kong, China, Japan, Korea & all over the world also. All these countries demand these products for preparations of soups to a great extend. Presently, IBC is exporting this to different countries with a large scale. "
Does i think my guess of fish belly is the closest compared to lips and lungs. Mawstick?