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What causes ulcers in Koi and Goldfish?

What Causes Ulcers in Koi and Goldfish? Both gill flukes (pictured) and skin flukes are common parasites which can cause ulceration in koi and goldfish. As mentioned above, the most common cause of ulcers are injuries which become infected with particular strains of bacteria living in the pond. Both aeromonas and pseudomonas bacteria strains are the […]