500 yuan. Isinglass is also commonly known as fish maw. Isinglass is a dried product of fish maw, which is an organ used by fish maw to assist in lifting and lowering in the water and assisting breathing. The relevant department announced that if 1,000 yuan per kilogram is sold at market price, the profit of 50% is 500 yuan. Isinglass, also known as fish maw or fish maw, is a dried product of fish maw or a glue made from boiled fish maw. It is as famous as bird's nest and shark's fin. It is one of the "Eight Treasures" and is known as "Ocean Ginseng".