Hi, im Carl the Landscape Guy,
In this video I want to show you how a natural pond that I built has developed so far. Today,
priority is given to the fish stock, part of which are koi. I already made several videos
about the pond, which can be found on my channel or by clicking on these links. The pond was
built without a liner. Existing silt and clay as well as the use of rainwater ensure that
the pond does not dry out. The pond as it is now was build 3 years ago. Since then many
different plants and species have settled without doing much to it. Fish were put in
after about 1.5 years, so the ecosystem was previously able to build up sufficiently and
form a bio-sludge. So a few koi are living in this pond for 1.5 years now. There are
no filters, pumps or ventilations used and I just wanted to show you how the koi are
doing. With an estimated visibility of about 40 cm
which 1,3 feet, the water of course is not as clear as in a conventional koi pond, so
the animals are not always visible. However, this has a positive effect on the welfare
of these animals. Their colors have improved significantly, after I had bought the koi
out of a small conventional pond. In more turbid water, the koi are able to hide and
avoid stress that way, which again can have a positive effect on their health. Now I can’t
give any medical prove since the animals have never been caught and examined, but no disease
symptoms are noticed so far. The koi like to eat the countless water fleas and organisms
cavorting in the pond water. This protein food contributes to a good growth of the fish.
According to koi experts it is much better for the koi then dry pellet food.
When I got the koi they were about 7 years old and haven’t grown the last years the pre
owner had them. The rather small size of the fish of about 40 cm (1,3 feet) was probably
due to the small size of the pond. Since I put the koi in their new natural environment
I was able to notice a significant increase in growth. So now some are more than 50cm,
1,7 feet long. The many microorganisms also take sufficient care about the biological
water purification and decomposition of the fish waste. From time to time I feed the koi
with pellet food. It took a while before they accepted the food, even though they were used
to it from your previous environment. They seemed to be scared by their new big pond,
but now however they got used to it. The different water and the switch from about 5 to about
400 cubic meters of pond volume of course was a major change for the animals. Now they
got used to it and obviously enjoy their generous home as well as the existing aquatic plants.
They like seeking for edible between the plants or relax under the lily pads. They also like
to search through the ground in the shallow water areas so I had general concerns that
the water is becoming all turbid. But however, I must say that the water is more clearer
with each passing year. A small population of fish which doesn’t overfill the pond enables
the ecosystem to work well. In the future I would like to catch out all other fish like
gold-orfes and tenches that have been put in so far and replace them with koi. As a
landscaper I am interested in this project and I would like to know if these fish survive
permanently and healthy without filters. Without the need for electricity, UV clarification,
ozone systems and costly maintenance work, this big pond can be operated environmentally
friendly and almost for free. My conclusions about this alternative pond don’t mean to
offend the conventional koi keeping, I just like sharing my observations and experiences
with others. Changes or new features for this pond will gladly be caught on video and published
on my channel. In addition to videos of the construction and maintenance of this pond
there are more videos about gardening and landscaping topics on my channel. Thank you
for your interest, I would be glad about comments in the form of hints, questions or tips. Thanks
for watching, I’m Carl the landscape guy.

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