Dead Goldfish

Discussion in 'Pond Archive' started by John, May 10, 2007.

  1. John

    John Guest

    Just found 2 dead goldfish in my pond - black discolouring on their
    Can anyone help diagnose and say whether I need to do anything to the
    pond please?
    John, May 10, 2007
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  2. John

    kthirtya Guest

    kthirtya, May 11, 2007
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  3. Welcome, John.

    I trust our folk will give you some good help.

    Phyllis and Jim, May 11, 2007
  4. John

    ~ jan Guest

    Sick Fish or Sick Pond Form

    Please describe your problem, including fish characteristics, like;
    whirling, flashing, gasping at surface, wounds, etc.:

    Pond Size in Gallons? (litres*.26=US Gallons):

    Water Source (Well, Irrigation, City?)
    If City how is water treated?: =

    Time in Operation?
    (How old is the pond/water?):

    Liner type? (EPDM,PVC,RUBBER,Cement/Concrete etc):

    Fish Population?
    Type? Size? QTY, Time in Pond:

    Food? Type and Frequency of feedings.:

    Pump Type, IN/OUT of pond, GPH etc
    (Describe your filtration system as well as possible):

    Prefilter media type? Last cleaned?:

    Filter is BIO or Mechanical? Last cleaned? How?:

    Carbon added? How much? When last changed?:

    Aeration? Waterfalls? Bubblers?

    Water Temp?



    Ammonia (ppm or mg/l):

    Nitrite (ppm or mg/l):

    Nitrate (ppm or mg/l):

    Water Color, cloudiness, odor?:

    Water changes? (% of pond volume and how often):

    Additives used (water conditioners etc):

    Tests done by self or another?:

    Weather (what's it been like lately?):

    Medications used?:

    What Zone or Country of residence?:

    ~ jan
    ~ jan, May 11, 2007
  5. John


    black is almost always toxic water, like if they sat down on mulm that
    had a lot of H2S coming out. is the pond clean on the bottom?
    black spots are a sign of disease transmitted by snails.
    If you got em right away take a look at the gills. dark gills = toxic
    , May 11, 2007
  6. John

    John Guest

    Soil/silt on bottom of pond - cleaned out last year. Water still
    cloudy from extracting leaves, blanket weed etc.
    Does it need cleaning out regularly - some fishponds seem to go on for
    ever without cleaning.
    Lots of pondweed plants etc.

    John, May 13, 2007
  7. John

    John Guest

    Thanks for spending time on this. It is only a small garden feature
    John, May 13, 2007
  8. John

    John Guest


    John, May 13, 2007
  9. John

    ~ jan Guest

    Soil/silt on bottom of pond - cleaned out last year. Water still
    Thank you for filling out the sick fish form, that explains a lot. Ingrid
    hit the nail on the head, dirt bottom, bad water conditions.

    I don't know which man-made ponds go on forever.... usually when not
    maintained, cleaned bottom, refreshed water, things start to die in 3-5
    years depending on fish load. The bottom needs to be cleaned every fall
    minimum, and water should be partially removed and new added 20%

    On a pond that small, you might want to try a wet/dry vac to suck out the
    muck (if you have one). They won't cloud up the water as much which release
    H2S into the water, toxic for the fish. ~ jan
    ~ jan, May 13, 2007
  10. John

    Kurt Guest

    Wet/dry vac has been my new best pond maintenance tool thanks to this
    group. Cheap at Home Depot (or other). Only concern is keeping fish away
    from being sucked it, but they generally scurry to other end of pond.
    I also put it down to the bottom before switching it on, and turn it off
    before i bring it up.
    Kurt, May 14, 2007
  11. John


    in nature the only ponds that "live forever" have a river running thru
    them. all other ponds silt up, become a swamp and eventually good
    rich bottom land for farming.
    our little ponds need to be cleaned out OR, there needs to be a strong
    pump that removes the mulm and deposits it into a veggie filter. a
    pond that collects a lot of leaves wont keep up even with a veggie
    filter. we have a smallish pond under the window at our dacha and it
    has to be totally cleaned out every spring. Ingrid
    , May 14, 2007
  12. John

    John Guest

    Thanks to all.
    It seems that the wet/dry vac is the best option - just scooping out
    the muck would presumably stir up all the poisons and kill the fish?

    John, May 15, 2007
  13. John


    yep. what the "pros" do when they come to clean the big ponds at the
    dacha is fill a holding tank with the "first" water out of the pond,
    drain it with their big pumps until the fish are almost flopping, net
    the fish, frogs, etc. move everything out. then they start with
    buckets and plastic shovels to remove the muck. they end up with
    brooms on the bottom, altho they dont do the sides and dont "rinse"
    either. running the water back in is the slowest. they do this when
    the temp of the pond water is @55o, which is the temp of the water out
    of the well so there is no thermal shock to the fish. Ingrid

    - just scooping out
    , May 15, 2007
  14. Hi John,

    Here is a link to another vacuum method:

    The rig is shown in the bottom two photos. I built one and have been very

    San Diego Joe
    4,000 - 5,000 Gallons.
    Koi, Goldfish, and RES named Colombo.
    San Diego Joe, May 15, 2007
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