Weird Goldfish Disease?

My Oranda has a bubble like sack on its dorsal fin, that may or may not be filled with fluid. It moves from side to side as the fish swims. I picked it up when it first appeared to examine it closer and the sack popped and came back the next morning. The bubble is about the size of my thumb now and I have no idea what to do. If there is any advice you could give me, that would be great! (: Thank you!!!

The picture I added shows what it looks like...

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Permalink Reply by Ernest Lee on August 29, 2012 at 8:01pm

Has the behavior of the fish changed at all? (i.e., not eating, swimming different, tilting, etc).

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Permalink Reply by Katie Gander on September 5, 2012 at 3:38pm

Nope... still swimming like his normal self.

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Permalink Reply by Elliott Ong on September 7, 2012 at 11:18am

Sounds like gas bubble disease. It is caused by too much nitrogen or oxygen in your water. You can try aerating the water and see if it goes away although there are no guarantees. This is caused by cold tapwater being under pressure as it comes out of the tap and trapping these gases, so to prevent this from reccurring, heat up cold tapwater before adding it to your tank as it encourages these gases to dissipate.

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Permalink Reply by Katie Gander on September 7, 2012 at 8:41pm

Thanks for posting that (: That is actually quite helpful. I bet that is the problem, cause I live in a really old house.

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Permalink Reply by Katie Gander on December 10, 2012 at 10:46pm

I know this is a long time after the fact, but I was updating my wall, and I thought of this particular experience... First off, I want to thank you all for you posts, you guys were very helpful. (: Months after the bubble went away, he got dropsy, infected all my other fish, and in turn died miserably after my failing week long attempt in saving him in a recovery tank. Out of the 3 large goldfish that were in the tank, 1 survived. ...VERY tragic indeed, because they were all fancy, and at least 6 inches in length. Dropsy is one of the hardest diseases in goldfish (and in a lot of other fish) to cure, because fish don't usually show signs of dropsy until they are in it's final stage. For those of you who don't know...The fish's scales protrude outwards due to massive growth in organs, and look similar to a pine cone. The fish has trouble eating, swimming upright, etc. ... and most will die, because of this. There are plenty of medications out there that have been known to help treat dropsy, but there is no cure. Because of this, I used the natural home-remedy before it was too late for my final surviving fish. The easiest way of curing the fish of dropsy is to spot it early on, in which in my case I was just waiting for my fish to get sick, because of the other one. Back to my beginning topic... I don't know if this will ever help you in the future, but I just wanted to say that Elliot Ong's post was extremely helpful in curing it's first disease, and the fish went on to live months later. Thank you guys, and best of luck with your own tanks. (: