I have kept Carp in my backyard pond (5x4x2 meters) for years. I have caught them every now and then while fishing, and never seen one longer than 75 cm. I am talking about Carp not Koi. I got 3 in my pond. The largest is 60 cm. I feed them lettuce and Koi food. I love them.
At my parents' house my mother and I put a Goldfish Pond in one of her gardens. A local farmer had the Common Carp in his water troughs for his dairy cattle to keep them clean, and he let us have a couple. These fish are very beatuful and come in a variety of colors. They look great in our pond.
Koi/Carp are among the most frequent victims of what I like to call "fish-havers" - people who are more interested in "having" a fish in their tank than actually caring for it properly, and therefore cannot be considered true "fish-keepers". It doesn't help either that bad shop owners will happily sell them to ignorant customers. Enthusiasts of fish-having will buy/sell baby Koi to be put inside small to medium home aquariums, and they'll even recommend it to others, resorting to the lame myth of "fish grow to the size of the tank". They conveniently forget to take into account that this fish can live for 20 years or more, and "growing to the size of the tank" actually means becoming weak, stressed, stunted and surviving in there for no more than a couple of years, sometimes even months, without ever having the opportunity to live an adult life.
Common carp (not koi) are gray and wreck rivers and lakes which kills the natural fish. Around here (Waukesha County, Wisconsin, USA) carp spearing is a great sport which I'm involved in. I love koi, but they are also very bad for the rivers and lakes, so don't let them go or someone may spear them. I have already tried to spear a koi in the river by my house which my friend let go. Even feeder goldfish should not be released.
I'm relatively new to fish-keeping, but I have had koi for two years now. These things can eat a lot of food, especially in summer, and need strong filtration to keep the water clean. This isn't difficult, although it can be expensive to start. Given how fast my first fish grew (it started at 8 cm and is now well over 30 cm) I wouldn't recommend keeping them in an indoor tank unless it is extremely large (my new pond is roughly 5000 L). Despite the special considerations for size and filtration, these fish are so much fun to keep and with a little persistence you can have them eating out of your hand.
Carps are a very interesting kind of fish. I live in Pennsylvania (USA) and we have a giant lake where there are literally 13,000 carp. They will pile up and make a giant blanket of a large part of the water looking for food, and the birds actually walk on them! I would recommend carp to people who have bad cleaning problems, because carp will eat anything, just like catfish. But if you are looking into carp you would be better off keeping them in a pond in a garden or an artifical pond. Although an artificial pond may be hard because you need lots of room for 1 carp and you should have more than one too.
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