19h • Vet Cases⚕️
🐟 Case Study: Why Are Koi Dying Overnight?
Meet Sakura, a prized 6-year-old koi in a backyard pond in California. Her owner calls in a panic on a warm September morning. Five of his twelve koi are dead and three more are lying on the bottom gasping. The water temperature is 73°F.
You arrive and notice something immediately. The surviving fish are coated in thick excessive mucus and their eyes look sunken rather than bright. You check the gills on a freshly dead fish and find white and gray mottled patches where healthy red tissue should be.
The owner mentions he added five new koi from an online seller three weeks ago without quarantine.
This is Koi Herpesvirus. At 73°F, the temperature is perfect for viral replication. The gills are being destroyed faster than the fish can breathe.
There is no antiviral treatment. Your first move is not medication but a PCR swab of gill and kidney tissue, followed immediately by a call to state animal health authorities. KHV is an OIE-listed reportable disease.
The quarantine failure three weeks ago made this inevitable.
💡 The takeaway: In fish medicine, a four week quarantine is not optional. It is the difference between one sick fish and a pond full of dead ones.
For the full course on this disease, see the classroom or follow the link below:
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🐟 Case Study: Why Are Koi Dying Overnight?
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