Start with the symptom
Visible signs are often the best starting point. White spots, swelling, fin damage, and gasping each point toward different possible checks.
Urgent fish health checks
What's Wrong With My Fish?
Noticing spots, torn fins, swelling, gasping, strange swimming, or appetite changes? Start by checking visible symptoms, recent tank changes, and water quality. If you are unsure, scan a photo in Fish Disease Identifier.
Fish Disease Identifier
Start with one clear photo.
Scan your fish and compare likely disease matches, possible causes, and next checks to consider.
Educational only. Not veterinary advice.
Fast visible checks
- Look for visible symptoms: spots, torn fins, swelling, cloudy eyes, fuzzy growth, or red gills.
- Check behavior: gasping, rubbing, hiding, floating sideways, not eating, or clamped fins.
- Review recent changes: new fish, new food, water change, filter cleaning, medication, or temperature swing.
- Test ammonia, nitrite, nitrate, temperature, and pH before assuming one disease.
Check the water
Many fish disease signs can be caused or worsened by water quality. Ammonia and nitrite are especially important when fish gasp, clamp fins, or become lethargic.
Use the app as a starting point
Fish Disease Identifier can compare a clear photo with likely disease matches and practical next checks, without claiming certainty.
Know when to get help
Severe, worsening, or unclear symptoms should be reviewed by an aquatic veterinarian or experienced aquarium professional.
Symptom guides
Start with white spots, torn fins, swelling, gasping, cloudy eyes, and behavior changes.
Disease guides
Compare likely matches such as ich, fin rot, dropsy, velvet, flukes, and bacterial problems.
Fish Disease Identifier app
Scan one clear fish photo and compare likely disease matches, possible causes, and next checks.
Fish Disease Identifier
Still not sure what your fish has?
Scan a photo in Fish Disease Identifier and get likely disease matches, possible causes, and next steps to consider.
Educational only. Not veterinary advice.