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Can a Goldfish change it's color?

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Hi I have a gold pearlscale. Well at least it was yesterday...today I got whiplash when I did a double take at feeding time. Goldie has black markings and they were NOT there yesterday. There is now black in her dorsal fin, at the base of the dorsal fin and on both sides.

Now IIRC I thought I read that black is a fugitive color in goldfish and could disappear but I don't remember reading anything about new colors popping up. I've had Goldie now for about 3 months and she was about an inch and a half long when I got her. She has since almost doubled her size. Can anyone let me know if this has happened to them.



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the blackening of fins can be natural colour but in most cases is bad quality of water. i will be moving this to Diagnosis and Discussion forum. please take some time to answer all the questions asked in the white box at the top of the page. it will be very helpful if you can also provide some pictures of the new black marks shown on your fish.

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Here are the questions Stakos was referring to :)

    Test Results for the Following:
  • * Ammonia Level
  • * Nitrite Level
  • * Nitrate level
  • * Ph Level, Tank (If possible, KH, GH and chloramines)
  • * Ph Level, Tap (If possible, KH, GH and chloramines)
    Other Required Info:
  • * Brand of test-kit used and whether strips or drops?
  • * Water temperature?
  • * Tank size (how many gals.) and how long has it been running?
  • * What is the name and "size of the filter"(s)?
  • * How often do you change the water and how much?

  • * How many days ago was the last water change and how much did you change?
  • * How many fish in the tank and their size?
  • * What kind of water additives or conditioners?
  • * What do you feed your fish and how often?
  • * Any new fish added to the tank?
  • * Any medications added to the tank?
  • * List entire medication/treatment history for fish and tank. Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.
  • * Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?
  • * Any unusual behavior like staying at the bottom, not eating, etc.?

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