Why Is My Goldfish Turning Black?

Answer

The reasons a goldfish turns black could be due to too much ammonia in the water or over feeding. It can also be due to overcrowding of the gold fish in a tank that is too small. By correcting these things, the fish can turn back to gold.
Q&A Related to "Why Is My Goldfish Turning Black"
When a goldfish turns black, it can be a sign of healing. Similar to bruising on a human, this means they are getting better, and will turn back to gold, once they are better.
http://www.ask.com/web-answers/Science/Nature/why_...
The blackening of your fish's tail is most likely an ammonia burn. Do a large water change and cut back feeding to 2-3 times a week until the ammonia levels go down.
http://wiki.answers.com/Q/Why_is_my_goldfishes_tai...
Goldfish have several different types of skin cell that determine the coloration of the fish. Those present in black coloration are called melanophores and they contain melanin, a
http://www.ehow.com/info_8785278_do-goldfishs-fins...
If it is just black spots, your fish is probably healing from ammonia burn. They
http://www.chacha.com/question/why-did-my-gold-fis...
1 Additional Answer
Chances are your goldfish is turning black due to a chemical burn. Check your water chemical levels. Usually turning black indicates too much ammonia in the water. You can find more information here: http://thegab.org/Illness-and-Treatment/what-is-wrong-with-my-fish.html#BlackSpot
Explore this Topic
Goldfish often turn black due to genetics, according to FishChannel.com. A goldfish can change color several times over the course of its life. When a goldfish ...
Ammonia burns are the most common reason that goldfish turn black. High ammonia content in fish tanks causes irritation and trauma to the goldfish's fins. Ammonia ...
There are plenty of reasons why a gold fish would change its colour. First, it could be change of environment. It could also be water type, water temperature, ...
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