Why Is My Goldfish Turning Black?

Goldfish are some of the most popular and easiest creatures to look after.

Most people have had a goldfish at some point during their lives. Having a goldfish is a very rewarding experience and although they are little, they can be wonderful additions to the family. 

Despite their little and cutesy exterior, we can grow very attached to our pets, so it is important that we always remember to give them the utmost care and attention that they deserve. 

As long as you keep on top of regular feeding, tank cleaning and care, then your goldfish is sure to thrive in your home.

You should try to check up on your goldfish every morning or every day. It is important to keep a sharp eye on these little creatures. You may notice that there are some dark or black spots along the body of your goldfish. 

This is quite common, as some species of goldfish can have dark scales or blackness in their genetics. However, if this seems like it may be down to ill health then it should be counteracted as soon as possible.

Why is my goldfish turning black?

There are a few reasons why your goldfish may be turning black. One of the most common causes and most dangerous cases is due to ammonia in the water. This can be extremely toxic to goldfish and can poison their bodies, turning their scales black. 

When dirt, mess and leftover food is left in fish aquariums, the waste can rot and break down, causing it to release ammonia into the water. This is then ingested by the goldfish and causes toxic poisons to enter the body.

Always consult a vet or animal care professional before making any decisions regarding your pets welfare and health. You should always keep a watchful eye on your creatures to ensure there are no changes in their behaviour or wellbeing.

It is hard to notice whether the small black changes on your goldfish’ scales have always been there, as these changes tend to be small and insignificant. Over time you will begin to notice more and more and you may think that it is not an issue. 

Many different species of goldfish can have variation in their scales and sometimes it is nothing to worry about. Some goldfish may have a hint of blackness in their genetics and it will therefore surface on their body at some point in their lifespan. 

If your goldfish turning black seems out of the ordinary, then this is probably due to illness. If this is the case, then you need to act quickly and efficiently as possible. 

As goldfish reside within a tank or aquarium, they are exposed to the same water everyday. You should ensure that your goldfish’s tank has a great water purification system so that it can lead a happy and healthy life.

If a fish tank has poor ventilation and a bad cleaning system, the toxins in the water may begin to release levels of ammonia. This can cause small chemical burns and reactions on the surface of your goldfish. Over time those burns will react with the scales of your goldfish and turn them black. 

This is very unhealthy for your goldfish, so it is important that you clean and remove the ammonia from their aquarium for a clean and safe environment. They can then return to their natural color. 

Similarly, goldfish can turn black or suffer from some discoloration if there is bacteria or parasites within their water. This can give them a dull and dark look that needs to be rectified. In the same way as with ammonia poisoning, you should remove all elements of bacteria and parasites from your goldfish’s environment.

How to prevent black spots on goldfish

If your goldfish is suffering from black spots and it is definitely a cause for concern, you can do a few things to ensure your fish companion is brought back to good health. It may be ammonia poisoning, so you should ensure that you remove all toxins and levels of ammonia from its water.

Having a good water purification system or a great water filter is a wonderful way to ensure your fishy friend is happy and healthy at all times. Any leftover food, fish waste or dirt will release toxins into the water atmosphere and so a clean tank with a strong water filter is a great way of preventing ammonia poisoning in your goldfish. 

If it may be parasites upsetting the healthy balance of your goldfish, then this can come from water snails in the water. If your goldfish resides in a pond or tank ensure there are no water snails inside.

Keeping a clean tank is the ultimate way of ensuring your goldfish remains healthy and strong for the times to come. Having a water filter is a prime way of keeping a tank clean, however you could think about changing the water regularly. Removing all decorations and items from the water for cleaning will also improve the cleanliness and safety of your fish tank. 

By giving your goldfish a sense of variety in its diet, it can keep their immune system strong and improve their ability to fight off nasty infections and bacteria. Providing your goldfish with a range of fish food pellets, flakes and feed will keep them healthy and strong. 

If you have any deep concerns about your fishy friend then always seek the advice of a marine professional or a qualified veterinarian. They can advise the best action or medication to prevent your animals from becoming sick or unwell.