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Carassius auratus is not a freshwater fish why it contains iodine?
Freshwater fish also contain iodine

Carassius auratus (scientific name: Carassius auratus, abbreviated as crucian carp, commonly known as crucian carp melon seeds, moon crucian carp, earth crucian carp, fine head, perch, cold perch) in the Eurasian region is a common freshwater fish, is a spoke-finned fish order carp carp family crucian carp is one of the genus of fish. Carassius auratus is the scientific name of the edible wild crucian carp, which is a kind of ornamental fish, such as goldfish.

Carassius auratus is an omnivorous fish that feeds mainly on plants, and prefers to live in groups and choose its food. Tender meat, meat nutritional value is very high, per 100 grams of meat containing 13 grams of protein, 11 grams of fat, and contains a lot of calcium, phosphorus, iron and other minerals. The medicinal value of crucian carp is very high, its nature is flat and sweet, into the stomach, kidney, and has and in the complementary deficiency, in addition to wonkiness, warm the stomach into the food, tonic in the efficacy of anger. Carp is widely distributed, year-round production of waters throughout the country, to February to April and August to December crucian carp is the most fertile, one of China's important food fish. Maximum body length of about 30cm, habitat depth of 0 to 20 meters, non-toxic, economic food fish, inexpensive. Mostly produced in the Yellow River basin, the Yangtze River basin area, Erhai crucian carp is more famous.

Broadly speaking, the fish that can live in freshwater with a salinity of three thousandths of a degree can be called freshwater fish. In a narrower sense, it refers to fish that have only a "juvenile" or "adult" stage in their life history, or that have to spend their entire lives in freshwater. There are more than 26,000 known species of fish in the world, and about 8,600 species of freshwater fish. There are nearly 3,000 species of fish in China, of which more than 1,000 are freshwater fish.

There are about 26,000 kinds of fish known in the world, which is a large group of vertebrates with the largest number of species, accounting for about 48.1% of the total number of vertebrates. The vast majority of them live in the ocean, and there are about 8600 species of freshwater fish. There are nearly 3,000 species of fish in China, of which more than 1,000 are freshwater fish.

The 53rd element of the periodic table, iodine, is one of the halogenated elements in the 5-period family ⅦA. It was first discovered in 1811 by a French pharmacist, Kutwa, as a single iodine. Single iodine is purple-black crystals, easy to sublimate, easy to condense after sublimation. It is toxic and corrosive. Iodine monomer will turn blue-purple when encountering starch. Mainly used in the production of drugs, dyes, iodine, test paper and iodine compounds. Iodine is one of the essential trace elements of the human body, the total amount of iodine in the body of a healthy adult is 30 milligrams (20-50 milligrams), and the national standard for adding iodine to salt is 20-30 milligrams/kg.