Gold fish changed color from gold to black like?

Question

Ok we got this gold fish and put it in with another one and not long after it slowly turned another color has gold in it to but it has like Black in it now to is this normal its near its back area and the tail and dorsale fin anyone know anything about this weird happin? lol serious thou

Answer 1

Usually these spots are seen as the fish is healing from ammonia surges. The area that was burned will turn black and this is the healing sign. The spots should fade within about 2 weeks. Orange Goldfish will sometimes turn black on their back and sides. After about 7 days the patches disappear and the fish appears orange. This is known as "Melanophore Migration" and is usually caused by any type of chemical irritant or traumatic injury. Some very common causes: high level of ammonia, low pH, flukes, or ick. The black color will not show up until the irritant is removed and the skin begins to heal. However if there are snails in the tank or the fish are living in ponds you should read below.

These spots could be from the pigmented cysts that contain the larval stage of a trematode intestinal fluke. Symptoms: Small black or brown spots up to 2 mm (0.08 inches) across. These spots appear on the body and fins of the fish and sometimes on their mouth and eyes. Treatment: Modern anti-parasite treatments should kill the parasites. The spots once formed may remain on the fish.

Answer 2

Goldfish can change their color with age - young fish don't have a lot of color, but it can appear as they develop. This is more common in younger fish (you don't mention age or size here).

Another possibility is that it was being kept in overcrowded conditions, handled badly, or was kept in poor water quality and he'd suffered an ammonia burn. In this case, the black is a sign of healing skin in the areas that were burned - and these will fade over time.

Answer 3

It is normal to gold fish but it is usually the other way; black to white.

Answer 4

It's not at all unusual for goldfish to change colors as they get older but usually they go from black to gold rather than the other way around.

Answer 5

Goldfish do that. The reason is: Goldfish are blacker in colder water and golder in warmer water. It depends on the water temperature. Obviously, your water in your aquarium is colder than the water where you got your little fishy!