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.


  1. I love the pond. I have been waiting on someone to post a natural pond that was built in a backyard. but i also would like to know why bream,catfish,bass or even creek chub are not put in with koi in a,natural pond in just seems like that would make in more interesting to see what happens as the fish grow and live together. also other things like frogs,crawfish,salamanders. like in the wild. just curious because l love ponds and different kinds of pond fish.

  2. i try this a couple  weeks a go with small fry about 2 months old haven't seen any sinse but its a big pond dpo u think I put them a little bit early

  3. This is how they grow the huge 3 ft+ plus koi in japan, they use the huge mud ponds except they also feed heavily.

  4. If you add more plants around the border of the pond I think it will help improve visibility of fish, I only use plants as my filter, but still use a pump to send water through the plants roots as a bog filter, great pond you have there!

  5. Hello carl.. you did very well work.. I just want to know that how to remove green algae from water.. actually my pond water has turned to green.. I cant see any fish untill they comes to the surface..

  6. Thanks for such an informative video Carl. We were wanting to build a natural Koi pond in our backyard, but had been told by all of the experts that we needed a liner, filter, etc, to keep the fish alive. Thanks to your video though we know better now, so are going to keep it natural.

  7. The classical koi pond is mass animal husbandry what is ok but for this koi ponds have massive filters that contains around 10% of the actual pond. Your pond looks very nice but you miss the actual point of koi keeping what is not bad at all but Kois do better in bigger numbers and and let say you pond keeps 16000 Gallons and you would keep 15 to 20 adult koi between 2.5 to 3.5 feet what are regular sizes for adult animals so that you have to feed around a pound of food per day. Without propper filtration, oxidation, airiration and circulation a pond like yours would fail in a couple of weeks because it could not handle the stocking.

  8. I have a few koi in my farm pond but barely ever see them. Any ideas on how to get them to surface more often.we feed bream almost everyday.

  9. Do you know how deep it is? I just had a pond dug that's about 40 feet by 25 feet and I want to leave it natural but the guy only dug it about one feet on one side and about 2 feet on the other side. I don't know if that's deep enough for fish and will it look as good as yours in a few years. Rain fills it completely since there was always a lake that formed there before the pond was dug but do you know how deep yours is?

  10. This is fascinating, and these fishes… they are so golden they are basically shining in the sun. Absolutely stunning.

  11. In many parts of Australia koi are illegal because once they get in our waterways they out produce, predate and out populate our native species….so yes they thrive in water without filters etc…they are illegal to own in my state…I am going to move just so I can have some..

  12. koi do much better in a natural pond, they can eat when they like, and can adapt immunities to all kinds of ailments. people that spend $1000s and $1000 on filters and heaters with uv and all that rubbish are mugs in my opinion! koi shops are rubbing their hands together when they see them coming. an average koi pond in a garden needs a couple hundred spent on it at most. My 2000 gallon pond is ten years old, I've cleaned out the muck once, the water goes murky every year. I made a filter for $50 and the pump/fountain cost $150, plus some plants to help filtration. my water is perfect and all my fish are in perfect condition. when people see all this elaborate stuff they are told they have to get it puts them off, and just fills them with disappointment because they now think it will cost a fortune! sitting by the pond watching the fish do their thing is meant to be enjoyable and relaxing not a chore!
    there are three big lakes near where I live, the smallest is 1.5 acres, there are dozens of big koi in them all and lots of fry. the biggest weighs 19 lbs. they love living in the wild.

  13. I am pleased to see your video, as I recently dug out my pond to clean out the weeds, and plan to add fish. People are critical of the idea, but a large pond has been my dream. I will be aerating the pond with a waterfalls, as it will look good, and provide freshness.

  14. It probably doesn't compare to an auto feeder but I can see the benefits who really needs your koi to grow 80% per year anyway

  15. can u plz say can albino and irredecent sharks need air filters and can we keep them in pond and also how big will they be plz answer i need a help plz i needto do so

  16. well how did you get that i just went through a hurrican that killed my pump the fih are fine installed two aration koi 1 my pond is a back yard one 15 x 28 and the water is cloudy with floting suspenden algea so now what

  17. I have as of 28 oct 2017 put ten koi and a gold fish in a swampy pond with a free flow of water in and out, after a month they are active and well, this is my first time with koi and would like to get as much info as i can just watching them and talking to them i am seeing them more often they do not seem to eat pellet food i like your videos good help

  18. I was given a 10 inch blue backed koi with a white bellie . I named him fats domino, the next day i heard fats domino has died, so i hope my new friend will live on in his name he might not be able to sing but he grow up playing the blues

  19. I use simple filter and stock up my 24 cubic metre pond lightly with Koi and comets. Even when electricity is down for the whole day, my fishes do not grasp for air and the pond remained clear.

  20. i like the idea of natural ponds for koi, they where wild once they can be again , i like the old koi the brown ones , the natural ones

  21. thank you for all the info you have passed on with this and other videos. I have both types of ponds and koi only in the high maintenance one. BC of your info, I hope to breed some and have transfer them into the big natural pond.

  22. I have a 1,500,000 gallon natural pond. I have put about 40 or 50 koi in it over the last three years.
    I feed them pellets in the spring, summer and fall ( I live in CT). So far, they have done extremely
    well and are very happy, blending in with the other wildlife in the pond. They winter very well and
    are also reproducing. They will eat lettuce, watermelon and other vegetables in addition to pellets.
    If I go away, they feed on the natural food in the pond.
    The one problem is the birds that pray on them. I let my dog chase the birds away, but other then
    that there’s not a lot I can do to protect them. I have tested the water in the pond and it is very clean
    and pure, thanks to the natural balance of plants and other animals that live in the water.
    It gives me great joy to see these fish every day and I know each one by color and markings.
    I also have no filters, pumps or maintenance systems, except an aerator to bring up oxygen.
    I feel lucky to have these fish and recommend anyone with a natural pond to test the water
    do some research and start with a few fish to see what happens, if they have an interest
    in this hobby.

  23. Here is how I see it… Kois in artificial (plastic, concrete, metal, tarpaulin, etc.) ponds need "artificial" oxygen supply in their water hence the need for pumps and filtration system. Kois in big natural ponds like the one in this video, doesn't need those equipment because nature does it all for the fishes – plants, insects, mud, wind, etc. balances everything for the fishes health.

  24. i dont believe that filters and pumps are essential, in my experience fish grows best in ponds with plants, almost zero maintenance and the water is super crystal clear…

Leave a Reply

Your email address will not be published. Required fields are marked *