Happy Goldfish
- A list of common illnesses and diseases. Explains causes, symptoms, treatment and prevention.
- http://www.happy-goldfish.com

Government of Western Australia: Diseases of Farmed Goldfish and Koi
- Offers an overview of internal parasite infestation, as well as gill and skin diseases. Includes photos.
- http://www.fish.wa.gov.au/docs/pub/FHinfo/fhinfo05.php?0308

Dr. Jungle's Animal World: Freshwater Fish Disease and Treatment
- Index of various disorders, symptom and diagnostics chart, and recommended treatments.
- http://animal-world.com/encyclo/fresh/information/Diseases.htm

Diagnostic Guide to Identifying Disease among Goldfish
- Common and not so common ailments, plus problems caused by incorrect water chemistry.
- http://www.goldfishinfo.com/identify.htm

National Fish Pharmaceuticals: Aquatic Disease Control Center
- Includes a question and answer guide to diagnosis of disease, advanced diseases details, and a Koi pond section.
- http://www.fishyfarmacy.com/symptoms.html

NetPets: Common Diseases Found in Fishes
- Checklist, primary symptoms, afflictions and remedies.
- http://www.netpets.com/fish/healthspa/diseases/freshwater/diseases.html

FishDoc: Fish Disease Diagnosis and Treatments
- In-depth information on fish diseases, complete with recommended treatments.
- http://www.fishdoc.co.uk

Fish Diseases FAQ
- Prevention, diagnosis, and treatment of common ailments.
- http://faq.thekrib.com/disease-fw.html