Koi Fish Health: Managing Saprolegnia Infections

Parasitic fungi, most commonly Saprolegnia (saprolegniasis), cause "cotton-like" patches on catfish, often on skin or eggs, and are a result of poor water quality or fish stress. Treatment involves improving water conditions, addressing underlying issues like ammonia burns, and using topical or water-based treatments like malachite green or peracetic acid to manage the infection. What parasitic fungus looks like? 👉 Appearance: "Cotton-like" or fuzzy patches on the fish's body, fins, or eyes. 🔸

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