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we are building a new pond and are considering putting fish in there, do u have to have a filter or can you put fish in a pond without a filter xxx



  • nutcutletnutcutlet PeterboroughPosts: 26,845

    Fish lived in ponds before filters were invented so you don't have to.

  • ClaringtonClarington Posts: 4,949

    My father has had fish in his pond for twenty years and if there ever was a filter in there its not been touched! The water is always crystal clear due (I assume) to the plants in there (a mix of oxygenating and shade providing) and a seasonal maintenance (i.e not letting falling leaves fill the pond come autumn).

  • darren636darren636 Posts: 666
    Depends on the fish.

    The amount you feed the fish and the quantity of plants.

    We are talking about the partial nitrogen cycle that occurs in ponds.




    Small fish ( stickleback size) might be OK in a large pond with lots of plants,

    Goldfish absolutely need very large ponds with a mature filter.

    Koi , even more so.

    Maturing a filter is easy.

    Obviously, with fish, you will lose any aspirations for wildlife, you will also likely need to perform water changes during initial stocking.

    Do not put fish in a pond that has a new filter

    They will likely suffer greatly and die.
  • Thank you guys xxx

  • Mark 499Mark 499 Posts: 380

    It depends on the size of the pond & the type of fish, it's possible to keep goldfish without a filter but only if you keep a few in a reasonably sized pond, Do not consider Koi unless you are looking at a pond at least 4' deep & 1000 gallons plus.

  • It's 750 deep 2sq ft not sure anymore about getting fish now after reading the other posts
  • nutcutletnutcutlet PeterboroughPosts: 26,845

    2 square foot is very small for fish with or without a filterimage

  • darren636darren636 Posts: 666

    My 21 year old goldfish are a good 18 inches long.
  • nutcutletnutcutlet PeterboroughPosts: 26,845

    You'd have to fold them in half Darrenimage

  • darren636darren636 Posts: 666

    That's exactly it.

    I'd say 99% of goldfish buyers have no idea what they're getting themselves involved in.

    Perhaps the most poorly treated pet of the last 40 years.
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