Transporting and releasing new Koi into your pond
1) Place bag in car sideways on to ensure minimal water movement whilst driving home.

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2) Float fish for a minimum of 30 minutes (for up to 1 hour, for large differences in temperature) in a closed bag to ensure sufficient oxygen level remains. (Koi properly packed can survive over 24 hours in an oxygenated bag.)

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3) Ideally, open bag and lift Koi into pond. Try to avoid mixing the water from the bag with that in your pond.
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4) Ideally, cover pond totally when introducing new stocks, paying special attention to areas where the water returns, or where air is being added as fish will always jump in a new environment, and they will be most likely to jump in such areas. After 3-7 days if Koi no longer show signs on jumping, then it is probably safe to remove covers/netting. Even after this period still watch carefully for fish jumping.
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5) Watch Koi carefully. Sometimes the mixing of old healthy fish and new healthy fish can result in cross infection even if parasites / bacteria were not present on either fish.
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6) In the unlikely event that problems do occur, seek advice immediately from the centre where you purchased the fish from. They can not help cure a fish that has already died.