The fish in the photos is the exact fish you receive when you order.
If your koi are gasping at the top of the pond, it’s a clear sign that oxygen levels are dangerously low — often caused by heat, algae, or stagnant water. Here’s what to do immediately and safely:
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Increase Aeration Right Away
Turn on every air pump, waterfall, or fountain you have. If you only have one air stone, add another if possible. The goal is to create strong surface agitation to boost oxygen exchange.
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Stop Feeding Immediately
Do not feed your koi until they recover. Feeding during oxygen stress worsens water quality and increases oxygen demand.
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Partial Water Change (Cooler, Dechlorinated Water)
Replace about 10–20% of the pond water using slightly cooler, dechlorinated water. This helps lower the temperature and refresh oxygen levels — but avoid sudden drops greater than 2–3°C, as that can shock your fish.
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Shade the Pond
Use shade cloth, large umbrellas, or floating plants to block direct sunlight. Reducing sunlight will help slow oxygen loss and cool the pond naturally.
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Check for Algae Blooms
Excessive algae can cause oxygen crashes at night or in the heat. If the water is green or cloudy, consider a partial water change and increase aeration — avoid using algaecides during stress, as dying algae can make oxygen levels worse.
After They Recover
Once your koi stop gasping and seem calmer:
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Keep aeration running 24/7 during heatwaves.
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Perform small water changes every few days.
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Feed only in the cooler hours (early morning or late evening).
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Consider adding a pond thermometer and aeration backup system (like a solar air pump) for future heat events.
