Tropical Fish Disease Guide: Ich, Aeromonas & Fungal Infections

Tropical fish can contract various diseases due to environmental changes or weakened immunity. Early detection and treatment are the keys to recovery. Let's understand the symptoms and treatments of major diseases.

Ich (White Spot Disease)

Symptoms: Small white spots appear on the body and fins. Initially just a few spots, but in severe cases they spread across the entire body Cause: The parasite Ichthyophthirius multifiliis Treatment - Raise water temperature to 28-30 degrees C to shorten the parasite's reproduction cycle - Medicate with commercial ich treatments (malachite green-based) - Salt baths (0.5% salt solution) can also help as a supplementary treatment - Clean the gravel and substrate to remove cysts (eggs)

Fin Rot and Mouth Rot

Symptoms: Fins or mouth edges deteriorate and appear to dissolve Cause: Columnaris bacteria (bacterial infection). Triggered by poor water quality, injuries, or stress Treatment - Medicate with antibacterial treatments - Improve water quality (increase water change frequency) - Combine with salt baths (0.3-0.5%)

Aeromonas Infection (Dropsy and Hole-in-the-Head Disease)

Symptoms - Dropsy: Scales protrude outward, resembling a pinecone - Hole-in-the-head: Ulcers or holes appear on the body surface Cause: Aeromonas bacteria (develops when immunity is compromised, primarily triggered by poor water quality) Treatment - Antibacterial medications containing oxolinic acid - Treat in a quarantine tank - Early detection is critical. Severe dropsy cases are difficult to cure completely

Fungal Infection (Saprolegnia)

Symptoms: White to gray cotton-like growths appear on the body surface or wounds Cause: Fungus (water mold). Primarily infects wounds and eggs Treatment - Medicate with methylene blue or similar antifungal treatments - Salt baths (0.5%) are also effective - Prevent injuries by maintaining a safe environment

Basic Treatment Principles

• Use a quarantine tank (treatment tank): Prevents damage to beneficial bacteria in the main tank
• Follow medication dosage and duration: Don't overdose even if results seem insufficient
• Address root causes: Medication alone won't prevent recurrence without improving water quality and reducing stress
• Don't let your guard down after recovery: Maintain optimal conditions until immunity is fully restored

Find Healthy Tropical Fish on Bri-Choku

On Bri-Choku, you can purchase tropical fish raised in properly managed environments to minimize disease risk. Asking breeders about their health management practices and quarantine procedures before purchase provides extra peace of mind.