You cannot put koi into a new pond immediately. Here is why and when you can:
Why You Need to Wait
Cycling the pond: A new pond lacks beneficial bacteria needed to break down fish waste. Cycling takes several weeks and prevents deadly ammonia buildup.
Water quality: New pond water often contains chlorine, chloramines, and other chemicals harmful to fish.
Temperature: Koi are sensitive to temperature changes; the water must be stable and within the ideal range.
When You Can Add Koi
1. After the pond is cycled: Test ammonia, nitrite, and nitrate levels; they should be near zero. Water temperature should be stable and pH around 7.0.
2. Dechlorinate the water: Use a dechlorinator to neutralize remaining chlorine or chloramines.
3. Acclimate the koi: Float the bag for about 30 minutes to equalize temperature. Gradually add pond water to the bag every 15 minutes for about an hour, then release the koi.
Important Considerations
Pond size: Determines how many koi you can safely keep; koi grow large and need ample space.
Filtration: A properly sized filtration system is essential.
Feeding: Start with small feedings and increase gradually as koi adjust.
General timeline: Cycling takes 4–6 weeks; acclimation takes 1–2 hours.
Patience and a well-planned process are key to successful koi keeping.