Disease library

Fish disease library

Every disease, parasite, and infection in our knowledge base. Tap the keywords to narrow the list — the page updates with a clean, shareable URL.

7 conditions

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Goldfish

Parasitic Diseases in Koi & Goldfish

Parasitic infestations represent one of the most diverse disease categories in ornamental fish keeping. From the microscopic ciliate…

Mild To To To Severe

Freshwater Tropical

Columnaris

A highly contagious bacterial infection (Flavobacterium columnare) presenting as white/grey patches, often on the mouth, fins, or gills.…

Severe

Marine / Saltwater

Marine Ich (Cryptocaryon irritans)

Saltwater white-spot disease. A 2006 resistant strain renders traditional copper and formalin treatments ineffective — quinine sulfate is…

Severe

Marine / Saltwater

Marine Ich (Cryptocaryon irritans)

Parasite (ciliate protozoan) disease of aquarium fish. Key signs: white spots (larger and more diffuse than freshwater ich),…

Moderate

Freshwater Tropical

Ich (White Spot Disease)

Parasite (ciliate protozoan) disease of aquarium fish. Key signs: small pinhead-sized white spots (cysts) on skin and fins;…

Moderate