Adding new koi to your collection is exciting but requires careful preparation to protect both the new fish and your existing stock.
Before buying:
Research the dealer or breeder's reputationAsk about their quarantine and health testing protocolsInspect the facility's water quality and fish healthNever buy from tanks with sick or dead fish presentInspection checklist when selecting koi:
Body shape: symmetrical, no deformitiesSkin: no sores, ulcers, or raised scalesFins: intact, no fraying or rednessEyes: clear, not cloudy or sunkenGills: bright red (not pale or brown)Behavior: active, swimming with the group, good appetiteReceiving and acclimation:
Float the sealed bag in your quarantine tank for 15-20 minutes to equalize temperatureGradually mix quarantine water into the bag over 30-60 minutesNet the fish into quarantine -- NEVER dump shipping water into your systemDim lighting and minimize disturbance for the first 24 hoursDo not feed for the first 24 hoursFirst week in quarantine:
No feeding day 1, begin small amounts on day 2-3Daily water tests (ammonia, nitrite, pH)Observe behavior, appetite, and physical condition closelyPhotograph each fish for identification recordsBegin quarantine treatment protocol if planned