Fin Rot
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About this condition
A Columnaris bacterial infection that causes tail fins to turn white and dissolve. Poor water quality and overcrowding increase risk; it can progress to the body if left untreated.
Common symptoms
- Tail fin dissolving and turning white
- Fin edges becoming white
- Fin splitting and tearing
Common causes
- Columnaris bacterial infection
- Water quality deterioration
- Overcrowding
Prevention (husbandry & daily care)
Water quality management, proper stocking density, regular water changes.
Related species guide
→ Browse the species guide for this animalWhen to see a vet
Consider consulting a specialist store within a few daysWhat can a specialist store do?
A veterinarian or specialist will assess the severity and advise on water quality improvement and an appropriate treatment plan. Prompt consultation is recommended when multiple medaka show symptoms.
Related columns
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- Recommended Aquatic Plants for Medaka | Choosing for Biotopes and Indoor Aquariums
- Aurora Medaka Care Guide | Tank Setup to Bring Out Rainbow Coloration and Breeding/Selection Tips
- Mariage Medaka Breeding & Care Guide | Management & Selection Methods to Enhance Lame Coloration
Other conditions in this animal
IchConsider consulting a specialist store within a few daysWasting DiseaseConsult a specialist store or experienced keeper promptlyPinecone Disease (Dropsy)Consult a specialist store or experienced keeper promptlySwim Bladder DisorderMonitor; consult a specialist store if it worsensVelvet Disease (Oodinium)Consult a specialist store or experienced keeper promptlyWater Mold Disease (Saprolegniasis)Consider consulting a specialist store within a few daysGill Disease (Gill Inflammation / Branchial Disorder)Consider consulting a specialist store within a few daysRed Spot Disease (Aeromonas skin infection)Consider consulting a specialist store within a few daysEgg Binding (Retained Eggs)Consider consulting a specialist store within a few days