Today, you will find goldfish ponds all over the
world, including Europe and North America. Since the
Goldfish hails from a wild carp that can live in cold
water, the Goldfish will survive outdoors during the
winter even in colder parts of the world.
regions it is however advisable to house your fish
indoors during the roughest months since it can suffocate
in a pond if the ice freezes across the entire surface.
Goldfish can be kept in ponds as well as in above ground
pools. It is recommended to plant your pond/pool since
goldfish will feel much safer in a natural environment.
It will also be able to hide among the plants in order
to avoid predators. A lot of animals like to chase
and eat goldfish, including cats, birds and raccoons.
Sometimes plants are not enough to guard your fish
and you will be forced to cover the pond with netting
during the night. In an above ground pool with straight
sides, the predators will be unable to wade in and
must instead perch themselves at the edge of the pool
when looking for prey.
This will usually be noticed
by your goldfish and it can seek shelter deep down
in the pool.
A planted goldfish pond is easier to maintain since
the plants will aid you in keeping up the water quality.
Live plants can use organic compounds excreted by
fish as nutrition. This means that the organic waste
will be absorbed by the plant instead of staying in
the water and polluting it.
plants will also inhibit algae growth since plants
and algae compete for the same nutrients. If you still
experience excess algae growth, you might be feeding
your fish too much. If you feed your fish a lot
of food, they will subsequently produce a lot of waste
and there will be plenty of nutrients for plants as
well as algae in the water.
Some algae are a natural
part of any pond or aquarium, but excessive algae
growth should be counteracted since it is unhealthy
for the fish. Keep in mind that if you use a chemical
to kill the algae, or if an algaecide is involuntary
introduced to the pond, the dead and decaying algae
will use up a lot of oxygen and your goldfish might
suffocate and die. Using natural methods to combat
algae, such as plants, is therefore recommended.
When you have filled your goldfish pond you should
treat the water with a water conditioner if you use
tap water containing chlorine and/or ammonia to fill
your pond. Check that the water temperature in the
pond is at least 60° F before you add any fish.
A common beginner mistake is to add all the goldfish
simultaneously to their new home. This will cause
a rapid change in water quality since the bacterial
colonies that inhabit the pond are too small to process
the sudden increase in organic waste. Instead, you
should ideally add one or two fish and allow the bacterial
colonies to grow larger before you add any new fish.
This will naturally also depend on the size of your
pond and if you are using any type of filtration.
In a large pond, excess waste will be dilute by a
very large amount of water and therefore less likely
to reach concentrations high enough to harm you fish.
Good filtration will also help removing organic waste
and other toxins from the water.
how many Goldfish can I fill my pond with?
a rule of thumb, one Goldfish per 30 gallons is recommended,
but this is naturally a very imprecise ratio. As mentioned
earlier, the water quality is one of the limiting
Plenty of water, developed bacterial colonies
and good filtration will make it possible for you
to house a larger number of Goldfish.
There are three basic types of filtration: biological,
mechanical and chemical. Biological filtration will
be taken care of by the mentioned bacterial colonies.
A mechanical filter will filter the water through
some form of filtering media where larger debris will
The most common form of chemical filtration
is the addition of carbon to the mechanical filter,
where the carbon will bind various types of toxins.
Another important factor to keep in mind when you
decide how much fish you wish to add to your pond
is aeration. Fish require air to breath and will suffocate
in a poorly aerated pond, especially if decaying plant
matter consumes a lot of the dissolved oxygen.
In an open pond, there will however be a considerable
gas exchange between the water and the surrounding
air. The larger the surface area of your pond, the
more oxygen will be brought to the water.
surface area will also make it easier for the water
to release carbon dioxide. Plants in the pond will
also produce oxygen and consume carbon dioxide. In
some ponds, this will however not be enough and if
you want to be able to house a large number of Goldfish
some type of aeration is recommended.