introducing new fish to a koi pond

The availability of pond fish is seasonal, with the largest selection
offered for sale during the spring and early summer months.

This is a good time to purchase pond fish, because it gives hardy
varieties that overwinter in the pond the opportunity to become
well established before the onset of colder weather.

Always obtain pond fish from a reputable supplier who allows you
to inspect the fish before purchase.

Most aquarium stores offer a range of coldwater fish, but if you
want exhibition-standard koi you should seek out a specialist dealer.

Pond fish are usually priced by size, with the largest individuals
commanding the highest prices.

It is best to start out with younger fish; this is not only less costly, but also gives you the opportunity to tame them.

Coldwater fish can grow rapidly under favorable conditions, so take
this into account when considering stocking levels for the pond.

House newly acquired fish in an indoor aquarium or a small
outdoor pond for a week or so before transferring them into
the main pond, to be sure they are healthy.

If you have only recently filled the pond, treat the water with the
appropriate amount of dechlorinator before introducing the fish.

Stocking levels in a pond without filtration should not exceed 2 in (5 cm) of fish for every 1 ft2 (0.09 m2) of pond surface area.


  • Make sure your chosen fish is swimming without difficulty through
    the water before asking for it to be caught.
  • View the fish from both sides, because a problem may be evident on one side only.
  • Inspect the fish closely for signs of skin damage, including missing
    scales or reddened areas on the body.
  • Look carefully for any signs of external parasites, which are hard to cut from a pond.


Most fish can be transported from the supplier to your pond in
large plastic bags, but very large koi may have to be moved in vats.

Care must be taken when transporting fish, to avoid subjecting
them to unnecessary stress.

If possible, use a local supplier to minimize the traveling time.

Adding oxygen to the traveling bag lengthens the time that the fish
can be kept in it, but never keep them confined for longer than necessary.

catching the fish introducing new fish to a koi pond

1.Catching the fish
The supplier will usually catch the fish for you, transferring it into a bag filled with water.


oxygen is added introducing new fish to a koi pond

2.Oxygen is added
To sustain the fish during transport, the bag is inflated with oxygen and sealed tightly.


safe travel introducing new fish to a koi pond

3.Safe travel
A cardboard box protects the bag and keeps it upright. Never leave the bag in direct sunlight.

release the fish introducing new fish to a koi pond

Releasing the fish
Do not dump the water into the pond; allow the fish to swim out, then discard the water.

Check out also my blog about koi fish meaning behind koi fish tattoo

How long should you quarantine new Koi?

30 days minimum time from the time that the last fish was placed in quarantine.

Feed quarantine animals last to avoid cross-contamination from water.

Keep the water temperature between 68-75F throughout the quarantine time.

Test for diseases and parasites 3 weeks into quarantine.

How long should you wait to put fish in a new pond?

If the temperature is right, float your fish in a bag of its previous
water for 20-30 minutes before releasing them into the pond.

How long do you leave tap water before adding fish in a pond?

1) Leave Water Stand for 24-48 hours. Recommended for: Smaller ponds with fish. Only works for chlorine.

If you have a small pond and need to perform a small water change
you can simply leave your tap water stand in a large bucket for 24 hours.

How do you acclimate fish to a pond?

As the bag floats on the surface, the water temperature in the bag
will slowly adjust to the water temperature of the pond.

This may take anywhere from 20-30 minutes. 2. After waiting, further acclimate the fish by opening the bag and slowly adding pond water

How long do you quarantine new fish?

Most hobbyists will keep their fish in quarantine for 2 to 4 weeks. During that time they often treat for parasites with a Copper Sulfate treatment for 14-21 days, and only treat for bacterial infections if there are obvious symptoms (ragged fins, red spots, etc.).

How long do you let fish stay in the bag?

ACCLIMATING YOUR NEW FISH. “Float the bag in the water for about 15 minutes and let them go.

How many fish should I have in my pond?

There are a couple rules that you can follow when it comes to calculating your pond capacity.

If you are keeping koi, you should allocate 35 gallons per inch of
fish if you are keeping goldfish this should be 20 gallons per inch.

How do you transition Fish from bag to tank?

Adding fish

  1. Take the sealed bag that your fish came in and float it on the surface of your aquarium’s water.
  2. Allow the bag to sit for ten minutes, then open the bag and add a cup of your aquarium’s water to it. Reseal the bag and let it float again for ten minutes.
  3. Repeat the previous step until the bag is full.

What is quarantine tank?

A quarantine tank is simply a small aquarium that is set up for the
purpose isolating a fish, or fishes, from your display aquarium.

Quarantine tanks are inexpensive and easy to set up, and are an
investment in protection for your aquarium.


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