Feeding should be reduced or suspended during rainy or overcast weather for three main reasons:
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Low atmospheric pressure during such weather reduces dissolved oxygen levels in the water. Since digesting food requires significant oxygen from koi, feeding under these conditions can easily lead to oxygen deficiency, gasping at the surface, or even suffocation.
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Water temperature often drops with rainfall, slowing koi digestive enzyme activity. Feeding during this time may cause indigestion, enteritis, or bloating.
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Rainwater runoff can introduce pollutants (e.g., acid rain or dust) into the pond. Uneaten food also decomposes faster in low-oxygen conditions, rapidly increasing harmful substances such as ammonia.
Practical Feeding Adjustments During Rainy Weather
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In light rain or brief overcast conditions, reduce feeding to about 30% of the normal amount, ensuring all food is consumed within one minute.
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During heavy rain, muggy thunderstorms, or consecutive overcast days, stop feeding completely. After the rain ends, wait at least 24 hours for water conditions (dissolved oxygen and pH) to stabilize before gradually resuming feeding.
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Throughout rainy periods, closely observe the koi. If they frequently gasp at the surface or appear lethargic and stay near the bottom, continue withholding food until their behavior normalizes.
Beyond feeding adjustments, also monitor water quality parameters such as ammonia, nitrite, and pH, as rainfall can dilute minerals and alter chemical balances. If possible, increase aeration during and after rain to maintain oxygen levels. Once weather improves and the pond environment stabilizes, resume feeding cautiously—starting with small portions of easily digestible, low-protein feed—before returning to the normal routine.
Adjusting feeding according to weather conditions helps reduce digestive stress and water quality risks, supporting both koi health and pond ecosystem stability.
