Fish Disease Database
Identify, treat and prevent common aquarium fish diseases.
White Spot (Ich)
The most common aquarium parasite, appearing as grains of salt across the body and fins.
Fin Rot
A bacterial infection that frays and erodes the fins, usually triggered by poor water quality.
Velvet
A parasitic infection that coats fish in a fine gold or rust-coloured dust.
Dropsy
A symptom, not a single disease — fluid build-up causing a swollen body and raised 'pinecone' scales.
Swim Bladder Disease
A disorder of buoyancy control, common in fancy goldfish and bettas.
Popeye
Swelling behind one or both eyes causing them to bulge outward.
Columnaris
A fast-moving bacterial infection often mistaken for a fungus, forming white cottony patches.
Gill Flukes
Microscopic parasitic worms that attack the gills, causing severe breathing distress.
Anchor Worm
A visible crustacean parasite that embeds in the skin, leaving a thread-like tail.
Fungal Infection
Cotton-wool-like growth on the skin, fins or eyes, usually on already-injured tissue.