Emergency Aid for a Koi After Tap‑Water Exposure

Immediate Response

A koi was exposed to untreated tap water (chlorine/chloramine) when a hose was left running. The owner asked if the fish can be “stimulated” to recover.

Correct Procedure for Tap Water

• Never add tap water directly to a pond or tank without dechlorinator.
• Let tap water sit 24–48 hours to off‑gas chlorine, or use a commercial conditioner.

Helping a Fish in Respiratory Distress

If a fish is gasping, gently move it back‑and‑forth through the water to force water over the gills. If it doesn’t resume normal swimming within 30 minutes, recovery is unlikely.

Prevention

Always use a timer or automatic shut‑off on fill hoses, and keep dechlorinator on hand for emergencies.