Acclimating pond fish. You found a reputable koi or goldfish dealer. You made sure all the fish were active, swimming energetically and look healthy. You even asked how long the fish have been on site and if they have been quarantined. Finally you picked the perfect fish(es) for your pond. Now you need to make sure you know how to safely add these koi or goldfish (acclimate) them to your pond.
Aquascape has produced a very informative video that covers all the basics for acclimating pond fish in your pond, so rather than writing an article about this you can just watch the video.