INTRODUCING FISH TO YOUR POND

Take the fish in the plastic bag you purchased them to the pool as quickly as possible.
Float the bag in the water for 15-30 minutes so that the temperature of the water in the bag can adjust to that of the pool.
The top of the bag can be opened and rolled down to form a float that will keep the bag upright. Whilst it is floating slowly introduce several cupfuls of pool water so that the fish can acclimatise to the new water chemistry. This further reduces the possibility of stress.
After the prescribed time, gently upend the bag and watch the fish swim away to investigate their new home.
Allow the fish to settle down for a couple of days before you begin to feed them (that is if you intend to feed them). When you do, start with very small amounts of floating food. If they are not interested, net it off. Only feed what they will consume in 5 or 10 minutes. If the food is allowed to sink to the bottom, it will rot and begin to cause untold problems. The results of over feeding are the most common cause of death and disease in fish in newly established ponds.