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I bought 4 golden fish 4-5 months back. I kept them in a bowl of water, was daily removing a glass of water and was adding fresh glass of water.

Starting 2-3 months everything was fine. But slowly one of the fish started getting black spots on its outer surface of body and then died. Then one by one rest of the fish also died.

This also happened when I tried keeping them in aquarium which also had air pump for oxygen. Any one who can let me know what was the reason that this happened?

Thanks

  • It's a common misconception that you can keep goldfish in a glass (see @LunarWatcher's answer below). It's animal torture. Changing a fixed amount of water so often is the base for a lot of distress which can end deadly. What are the water values for ammonia, nitrite and nitrate before changing the water? – Karl Richter Apr 28 '17 at 17:01
  • I didnt kept my fishes in glass instead i was saying that i was daily changing a glass of water from the bowl in which i kept my 3-4 golden fishes. – Akshay Chawla Apr 30 '17 at 10:50
  • I was intructed to change daily a glass of water from the bowl by the shop owner from where i brought my fishes. – Akshay Chawla Apr 30 '17 at 10:55
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    I mean't it's a misconception that you can keep goldfish in a bowl, sorry. Everything said applies to the bowl as well. – Karl Richter Apr 30 '17 at 11:28
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The result may be ammonia poisoning.

The solution may be to add a filter into your tank, and make sure you don't overpopulate the fish tank either. Don't feed them too much

Further, each goldfish needs 3 gallons of water per inch of their body or more.

Source 1 source 2

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  • General rule for goldfish where I work is 10 gallons per goldfish. Just to make sure there is room for growing. Plus, most who buy goldfish are beginner aquarists, so we keep in mind that they might not be feeding the right amount or have the water quality where it should be. – NealC Apr 29 '17 at 0:20
  • Yes i am a beginner aquarists. I love to keep fishes in my house. I was planning that will gradually increase the size of aquarium and amount of different fishes, but as my fishes died twice now i want to aquire all the necessary knowledge before again bringing them back. – Akshay Chawla Apr 30 '17 at 10:54
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There might be several reasons for fish to get ill and die. Over feeding might result in toxic substances developing in the water. This often weakens or kills the fish. The fish might also be infected before you buy them.

You need a water filter to handle the waste from your fish, and the fish tank needs to be cycled before you add fish or other animals to the tank.

"Cycling a tank" means letting bacteria that break down waste grow and multiply so they can keep the water clean. These bacteria convert fish waste to plant food, this is called the nitrogen cycle.

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Ammonia could have been it or you could not have been using filtered enough water in the first place. They also would be way to crowded in a bowl. Especially or four.

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  • but the shop guy told me that i can keep 4 fishes in bowl, but not more than that. – Akshay Chawla May 10 '17 at 8:27
  • how big is the bowl?! you need at least a 2 gallon for a smaller species of goldfish because they get big because they are related to carp – Monotremes May 10 '17 at 12:16
  • Don't believe the shopkeepers – Diether Jun 9 '17 at 15:02

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