Core principle: Equipment safety comes first; it is better to underfeed than overfeed.
Pre‑travel preparations (3–5 days in advance)
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Check equipment: Ensure the water pump, air pump, and heater (in winter) are working properly; clean filter pads.
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Stabilize water quality: Change 1/3 of the water, test ammonia and nitrite levels, and add nitrifying bacteria.
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Adjust feeding: Gradually reduce feeding and stop feeding one day before departure.
Response Based on Trip Duration
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3–5 days: Simply stop feeding; koi tolerate hunger well, and this is safer than overfeeding.
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5–10 days: Use an automatic feeder (set to 30–50% of the usual amount) and install a camera + power‑failure alarm.
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Over 10 days: Have someone look after the pond (train them in advance) and keep a DC air pump/generator ready for emergencies.
Safety and Monitoring
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Install cat/bird‑proof nets and infrared motion alarms.
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Set up a waterproof camera to check on the pond via smartphone.
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Keep emergency supplies such as oxygen tablets and chlorine dioxide effervescent tablets on hand.
Instructions for Caretakers
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Use a fixed container marked with feeding amounts and emphasize "less is better."
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Provide a checklist for equipment checks (e.g., whether the water pump and air pump are running).
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Prepare common medications with instructions for use.
After Returning
First observe the fish and test the water quality. Do not feed on the first day; gradually resume feeding from the second day onward, and inspect/clean the filter.
