According to the market price in February of 20 19, the profit from selling fish is quite large, with a profit of10-200,000 a year, and many people buy it.

It depends on what kind of fish is sold. From the perspective of ornamental fish and edible fish, the profit of ornamental fish is definitely much larger than that of edible fish.

Extended data:

Fish, especially cod and other fish that live in cold water and water, contain a chemical called trimethylamine oxide. Although the substance itself is tasteless, once the fish dies, the bacteria in the fish begin to decompose trimethylamine oxide into ammonia derivatives. It smells terrible.

Red meat is not like this, because it does not contain a lot of trimethylamine oxide. The reason why we think rotten fish products smell bad may be that the sense of smell has evolved to warn us of the dangers of eating fish for a long time.

Baidu encyclopedia-breeding