Goldfish Dropsy: Treatment, Causes & How to Identify this Disease

What are the Symptoms of Dropsy in Goldfish?

A goldfish coming down with dropsy will typically start off with increased body swelling, particularly visible behind the head until eventually the whole fish becomes bloated.

Then the characteristic “pineconing” scales appear.

This can be hard to detect with the untrained eye from the side…

… But is VERY apparent from above.

5 100% from 1 ratings
Rating 5 100%

The edges of the scales are lifted and prickle outwards off the fish’s body.

Some may even fall off in patches.

In advanced cases, the eyes may bulge out due to the large amount of fluid pushing behind them.

Some other symptoms may include septicemia (redness of the fins) due to the internal bacterial infection wrecking havoc on your poor fishy’s body.

A dropsied fish might not always have pineconed scales.  Sometimes it just swells up, usually with bulging eyes.

Egg-binding (what makes the fish look pregnant) does not cause that fluid behind the eyes.

What Causes this Disease?

Let’s get something straight:

Dropsy is caused by the inability of the fish to rid itself of excess fluid (something called osmoregulation).

It is thought that for many cases, dropsy is bacterial in nature.

There are some exceptions, such as if the kidney has been directly injured.

Some conditions that lead to dropsy can include poor water quality or secondary infection after stress. This is because the bad bacteria that cause dropsy love dirty conditions and they can only attack the fish with the help of one or both of these factors.

The bacteria can invade the fish’s body while it is weakened and destroy an internal organ such as the kidney, which regulates the fluid balance in the body.

But why isn’t the fish releasing fluids how it should?

That has to do with the root cause of dropsy.

The bacteria are usually the secondary cause of this disease, rather than the primary.

Is there a Cure?

Part of what makes dropsy so deadly is that by the time the pineconing is discovered, the damage has usually been done and the kidneys are shot.

Organ failure is NOT reversible.

That’s why many fish keepers opt to euthanize their fish once they are at this point, rather than prolong certain death. 🙁

But don’t despair:


If you catch it early enough, there might be hope to get the fish back on track before things get out of hand.

5 100% from 1 ratings
Rating 5 100%

It doesn’t work ALL the time (dropsy is often fatal)…

But it has worked, and may help your fish.

I hope it does 🙂

The Treatment Plan to Follow if Your Fish Has Dropsy


Many times, I’m all for all-natural methods of treating fish diseases, and find that antibiotics are way too overused to treat problems that don’t need them.

But dropsy is one of those serious conditions that has such high fatality rates that I believe they are warranted.

Sometimes, if it’s caught soon enough… and if the cause is bacterial…

They CAN save the fish when nothing else will.


Your fish may never be totally the same if it recovers from dropsy, but many owners still want to do whatever it takes to bring back their fish.

  • The combination of Kanaplex and Furan 2 has been able to reverse dropsy in goldfish.  These should be added to the water together.  This is a very strong treatment, but dropsy is aggressive.
  • It is also a good idea to add Epsom salts to the water as well. (use 1/4 tsp per 10 gallons of water.)  This can help to draw the fluid out of the bloated fish.
  • Feeding Metroplex in food by mixing it with Focus is also advised to combat internal infection.
  • Bringing up the heat fast (by 1-2 degree per hour) can harm the bacteria as well.  Hold it there for 2 weeks, then bring it down very slowly (2 degrees per day). Be sure to use an air stone in a hospital tank without a filter for this to keep the water well oxygenated and the fish separate from the others.  A sick fish can infect an entire tank as it spikes the bad bacteria count in the water.
  • Lots of large water changes are important. At least 75% should be removed every 48 hours.

Finally, don’t stress the fish. Keep the lights low and the fish calm. Ensure the water temperature stays stable when doing water changes. Don’t make loud sounds, etc. Anything that causes the fish to act frightened or bothered, avoid. Stress will hinder the fish’s natural immune response which you will be using to your advantage with this treatment.

If all goes well and you have acted in time, you should start seeing major improvement.

Once the treatment is over and the swelling and pineconing symptoms are better and the fish is looking perkier, maintain the large frequent water changes. Continue treating with the Epsom salts. The primary focus should now be on letting the fish heal.

Within another week, your fish should be much better if not healed.

Dropsy can return if the primary cause of dropsy was never addressed or if the fish gets stressed or weakened in any way.  Fancy goldfish are very delicate.

Post-Treatment Care

You (and especiall your fish!) don’t want to go through all of this only to have the dropsy return, sometimes even more severe. 🙁

So you want to make sure that you keep the water quality absolutely perfect during that time – which includes remembering not to overfeed.

As much as you want to spoil your fish for being such a trooper…

…Overfeeding is very dangerous at this point, as your fish is very weakened and vulnerable at this point.

It is recommended to keep the fish in stable, warm water for the rest of its life (75-80 degrees F).

Be sure to feed it a nutritious, non-inflammatory diet such as Azayaka sinking pellets.  Low quality foods that irritate the fish’s digestive system should be avoided.

Tip: supplement with mild, easy to digest foods like frozen peas or soft spinach.

Preventing Goldfish Dropsy

As with most diseases, prevention is far better than trying to try to treat your fish.

Dropsy is usually a condition brought on by something that weakened the fish to begin with.

There are actually many different causes of dropsy, and eliminating these can go a long way in keeping your aquarium safe from this menace.

I also recommend always using a beneficial bacteria treatment in the water to keep bad bacteria, including those that cause dropsy, to a minimum.

I talk more in detail about the 6 causes of dropsy in my book, The Truth About Goldfish, and how you can protect your fish from them to start with.

What do You Think?

Have you ever had success dealing with dropsy in your goldfish?

Did you learn something new in this article?

I’d love to hear about your experiences when you fill out the comment box below.

5 100% from 1 ratings
Rating 5 100%


  1. GMD56 February 27, 2018 at 3:33 pm - Reply

    One of my fish (011 a common goldfish) Had Dropsy. I knew about the garlic. I have a 50 Gallon tank for my three goldies and I had to quarentine him in a 5 gallon because thats all I had. I did practicaly everything you said to do here but she died. The next week Mike my comet goldie got it to so I did everything again. He died to. Now I’m left with Lucas my black moor goldie and he is in perfect health. So I wonder: why didn’t he get it? did I not catch it in time? how could I prevent this from happening again?

    Thanks in advance.

    Rating: 5
    • Pure Goldfish
      Pure Goldfish March 4, 2018 at 11:00 pm - Reply

      Sorry to hear about your losses. Dropsy is usually terminal by the time it is detected. Did you recently get new fish?

Leave A Comment