Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Common goldfish
"Fungal Infection" is the growth of fungus which could lead to problems regarding parasitic infections, ulcers, or open wounds; the fungus symptoms could worsen and lead to a secondary fungal infection. There are “cotton-like growths along the body and fins” which is caused by dirty water. Treatments start from moving the goldfish to a hospital tank and then clearing the environment with Methylene Blue if the condition is serious, however, the goldfish can just have a cleaner tank and the fungal infection should clear up over time.