There are parasites in fish.

Especially for those fish that live in places with poor water quality, the number of parasites in their bodies will also increase. However, most fish contain parasites that are not contagious to humans and will be killed directly when cooked at high temperatures. Therefore, unless there are some special circumstances, fish that have been heated to high temperatures will not become parasitized.

Parasitic bacteria are lower eukaryotes with pathogenic power. They are both pathogens and vectors for spreading diseases. Parasitism is characterized by the presence or attachment of all animals outside their bodies in order to maintain the nutrients or shelter they need for survival, development and reproduction.