Goldfish Pin Cone Disease & Hole-in-Body Disease Guide | Early Detection and Treatment of Aeromonas Infection | ブリちょく
Goldfish| ✍️ BreederDirect Editorial
Goldfish Pin Cone Disease & Hole-in-Body Disease Guide | Early Detection and Treatment of Aeromonas Infection
A comprehensive guide to the two major Aeromonas bacterial infections affecting goldfish—Pin Cone Disease (松かさ病) and Hole-in-Body Disease/Ulcer Disease (穴あき病). Explains symptoms, disease progression, and treatment methods in detail. Includes practical guidance on using Green F Gold and Epsom salt baths, direct topical application to ulcerated areas, and quarantine/treatment procedures for new fish introductions.
Key Takeaways
A comprehensive guide to the two major Aeromonas bacterial infections affecting goldfish—Pin Cone Disease (松かさ病) and Hole-in-Body Disease/Ulcer Disease (穴あき病). Explains symptoms, disease progression, and treatment methods in detail. Includes practical guidance on using Green F Gold and Epsom salt baths, direct topical application to ulcerated areas, and quarantine/treatment procedures for new fish introductions.
Aeromonas Infection
Goldfish Pin Cone Disease and Hole-in-Body Disease are both bacterial infections caused by Aeromonas bacteria. Aeromonas is a naturally occurring commensal bacterium in freshwater environments, but it rapidly infects and manifests disease when the goldfish's immune system is compromised due to poor water quality, stress, or injury.
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Both conditions rapidly deteriorate if discovered late, making early intervention extremely critical before treatment becomes difficult.
Pin Cone Disease (松かさ病)
Symptoms and Progression
Pin Cone Disease develops from the collapse of osmoregulatory function, resulting in ascites and edema.
Early Symptoms
Some scales begin to raise, especially on the flanks and near the tail
Mild reduction in appetite
Slight loss of body surface luster
Advanced Symptoms
Scales throughout the body stand up like a pinecone
The abdomen becomes distended (fluid accumulation)
Eyes protrude (may be accompanied by pop-eye)
The fish increasingly stays at the tank bottom
Appetite severely decreases
Treatment
Pin Cone Disease progresses rapidly and is one of the hardest conditions to cure. Early detection and early treatment is the only solution.
Medicated Bath Procedure
Isolate the affected fish in a quarantine tank (10-20L)
Epsom salt (MgSO₄) bath: 1g per liter (effective for reducing ascites) or saline solution (0.5%)
Antibiotics: Add Green F Gold granules (furan-based) or Elbaage Ace (containing oxytetracycline HCl) at the recommended dose
Maintain water temperature at 25-26°C (to activate immunity)
Continue aeration 24 hours
Continue medication while performing 50% water changes every 3 days (maximum 7-10 days)
Note: Cure rates are extremely low in terminal stages (scales raised throughout body + abdominal distention). Consult with a veterinary hospital about euthanasia as an option for pain relief.
Treating the Entire Tank
After isolating the affected fish, perform a 30-50% water change on the remaining tank
Clean the filter (preserve biological media)
Clean the substrate and remove organic matter
Medication (use preventive antibiotics for the entire tank with caution; be mindful of effects on beneficial bacteria)
Hole-in-Body Disease/Ulcer Disease (穴あき病)
Symptoms and Progression
Hole-in-Body Disease is characterized by tissue necrosis and ulceration on the body surface.
Early Symptoms
1 to several scales become congested and reddened
Scales bleed at the base
Scales begin to peel off, exposing the underlying skin
Advanced Symptoms
Multiple scales shed, exposing red flesh (appearing as "holes")
Ulcerated areas expand and may reach the muscle layer
Fins deteriorate (fin rot) and secondary infections progress
Reduced appetite and abnormal swimming
Treatment
Because Hole-in-Body Disease primarily affects body surface lesions, it is generally more treatable than Pin Cone Disease. However, as the condition progresses, bacteria can enter the bloodstream (bacteremia), becoming fatal.
Medicated Bath Procedure
Isolate the affected fish in a quarantine tank
Use saline solution (0.5-0.7%) to maintain strength and correct osmotic pressure
Antibiotics: Use Green F Gold granules or Parazan D (oxolinic acid) at the recommended dose
For large ulcers: apply diluted povidone-iodine solution directly to the lesion with a cotton swab (use alongside medicated bath)
Direct Application Procedure
Scoop the affected fish with a net and place on a damp towel (30 seconds or less)
Apply diluted povidone-iodine (1:10 dilution) to the lesion with a cotton swab
Return to tank
Repeat once daily for 3-5 days
Preventing Secondary Infection
The wounds from Hole-in-Body Disease are vulnerable entry points for water mold (Saprolegnia). If you see white cotton-like growth during medication, add Green F Liquid (methylene blue-based) to treat the water mold simultaneously.
Common Prevention Strategies
Water Quality Management
Management Item
Recommended
Ammonia
0 mg/L (at all times)
Nitrite
0 mg/L
Nitrate
50 mg/L or less
pH
7.0-8.0
Water Change Frequency
Once weekly, 1/3 to 1/2 of tank volume
The primary triggers for Aeromonas infection are poor water quality and overstocking. The best prevention is to avoid exceeding filter capacity and maintain low nitrate and ammonia levels through regular water changes.
Strict Quarantine Procedure
When introducing new goldfish, perform a 1-2 week quarantine in a separate tank and confirm no symptoms appear before adding to the main tank. Many Aeromonas infections spread through the introduction of infected fish.
Stress Reduction
Keep daily water temperature fluctuation to 1°C or less
Avoid overstocking, strong water currents, and sudden water changes
Maintain regular lighting schedule with darkness at night
Pin Cone Disease and Hole-in-Body Disease become extremely difficult to treat once they progress to severe stages. The most important habit for protecting your goldfish is to carefully observe them daily, quickly notice "something is different," and immediately isolate and begin treatment when abnormalities are detected.
