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Author Topic: Fantail Goldfish..... Dorsal Fin  (Read 2923 times)
Hizhonordemayor
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Fantail Goldfish..... Dorsal Fin
« on: May 11, 2009, 09:28:41 AM »

I have a quick question.... I have a Fantail Goldfish (male) appprox 4 months old that swims around without extending it's dorsal fin.  It will raise up a hair and then just lay on the fish's back.  Any thoughts of why this may be happening?  It's a 30 Gal Tank, plenty of filtration and additional air bubbles, live plants, loose gravel. Ph, Nitrate, Nitrire, levels are excellent. No chlorine present in any of the test strips. Monthly tank cleaning regimen.

Population of tank: 3 Fantail Goldfish, 2 Neon Tetras, 1 X-Ray Tetra.  No fighting, they all swim and play together, no aggressive behavior at all from any of the fish.

Thanks for your time and help!
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Hizhonordemayor
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Re: Fantail Goldfish..... Dorsal Fin
« Reply #1 on: May 12, 2009, 12:12:36 PM »

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I have a quick question.... I have a Fantail Goldfish (male) appprox 4 months old that swims around without extending it's dorsal fin.  It will raise up a hair and then just lay on the fish's back.  Any thoughts of why this may be happening?  It's a 30 Gal Tank, plenty of filtration and additional air bubbles, live plants, loose gravel. Ph, Nitrate, Nitrire, levels are excellent. No chlorine present in any of the test strips. Monthly tank cleaning regimen.

Population of tank: 3 Fantail Goldfish, 2 Neon Tetras, 1 X-Ray Tetra.  No fighting, they all swim and play together, no aggressive behavior at all from any of the fish.

Thanks for your time and help!


 Shocked   A new wrinkle ..... the Fantail that has the fin problem has now developed a dark verticle line on both sides of it's body where the tailfin and body meet.  My wife and I are very very new to fish and aquariums but so far (in the last year or so) we haven't lost any fish.  Any help and insight is appreciated.  I'm trying to grab a photo of the fish so i can show you exactly what I'm talking about.  Thanks, again.
« Last Edit: May 12, 2009, 12:53:09 PM by Hizhonordemayor » Logged
Hizhonordemayor
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Re: Fantail Goldfish..... Dorsal Fin
« Reply #2 on: May 12, 2009, 12:54:10 PM »

 Huh   I'll be addin g a picture.....

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Hizhonordemayor
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Re: Fantail Goldfish..... Dorsal Fin
« Reply #3 on: May 12, 2009, 12:54:31 PM »

[image]
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Hizhonordemayor
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Re: Fantail Goldfish..... Dorsal Fin
« Reply #4 on: May 13, 2009, 12:08:55 PM »

I can't believe no one has an answer to my questions.  In the meantime, none ofd the other fish in the main tank shoiw any signs of black markings and I've isolated the fish in the picture into a seperate tank. It's eating normally, swimming normally but still has the black marks on it's sides and will not raise the dorsal fin at all. C'mon, folks ...there's got to be an answer from one of you experts!   Roll Eyes
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asorvia
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Re: Fantail Goldfish..... Dorsal Fin
« Reply #5 on: August 20, 2009, 07:19:22 PM »

Your question is benign. A dorsal fin is only used for intimidation, communication but most commonly steering. since goldfish have no fear (because they are very unnatural) and no reason to scare other fish, they don't use their topmost fin for intimidation. however, your fish probably does not need to raise his dorsal fin. every fish i have ever owned seems to raise this fin when they encounter something new if for no other reason. they will also raise it whenever they decide to eat.
your problem is not a terrible concern, but a picture of your fish could be the key to discovering an ulterior reason for this lack of fin usage.
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