Common fish diseases

(1) viral disease: a virus can only grow and reproduce in the cells of plants or animals. once it leaves a biological cell, it looks like a dead thing, but it can attach to the cell, destroy the cell membrane, and let the genetic material of the virus enter the cell. then control the metabolic activity in the host cells and use the nutrients of the parasitic cells to create new viruses.

(2) bacterial diseases: bacteria are single-celled organisms, which can be seen under a high-power microscope. They have a non-cellulose cell wall and are propagated by dichotomy.

(3) fungal diseases: most of the pathogens that cause fungal diseases are symptomatic fungi. The body of fungi does not contain chlorophyll and is made up of hyphae. There are no roots, stems and leaves.

(4) Protozoal diseases: protozoa are single-celled organisms, most of them are not parasitic, and only a few cause diseases.

(5) trematodes: these diseases are caused by Gill trematodes or cutaneous strontium absorption. Trematodes have mouth but no anus.

(6) crustacean diseases: crustaceans are one of the arthropods, with hard exoskeletons and arthropods, which will attack goldfish and cause diseases.

(7) Diseases caused by chemicals: these diseases are caused by harmful chemicals in water.

(8) hereditary diseases: these diseases are caused by individuals with genes that cause the disease, so they cannot be treated.