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Author Topic: Black Line Lengthwise on Tail  (Read 820 times)
Pearlscaled
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Black Line Lengthwise on Tail
« on: March 16, 2012, 05:36:57 PM »

Hey everybody,

First thing first, I am new to this forum. Though I have been actively using the site for around a year, I ended up putting off making an account until today. I am a long-time goldfish and animal lover, volunteering at our local vet. Ive had goldfish for about a year now (though I had some as a young child), and have so far managed to resolve problems.

A couple of weeks ago, my 2 inch pearlscale Zippy started to develop a black line on his tail. It ran lengthwise, and was only about two millimeters thick. It grew a bit everyday, and stayed true to its original path, completely straight. After four or so days I started to get worried, thinking he may have something seriously wrong. I'd already done research, and nothing matched up. Eventually I called a few fish experts I know, and none could tell what it was. The whole time throughout he acted fine, as though nothing was wrong.

Two or three days ago, I looked into the tank and found the mysterious line was gone. My fish was acting fine, and there was no sign of anything wrong with his tail. I'm quite confused now as to what it is, for I never figured it out. I am hoping somebody here has an idea of what it was, as although it is now gone I still am perplexed.

Thanks for the help,
Pearlscaled
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nabi
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Re: Black Line Lengthwise on Tail
« Reply #1 on: March 16, 2012, 06:24:35 PM »

It could be a problem with your water quality.  You sometime see stuff like this if something is wrong with the water. Check your ammonia, nitrite, nitrate and PH readings. If you don't have a water test kit , i recommend you get the API freshwater master test kit, which is one of the best on the market for the price.  You can also bring a sample of the water  to a local pet store, where most will do a water test for you for free.

Make sure have the proper tank size for your fish, since water quality is much easier to maintain in a proper housing for your fish. Whenever you see something strange strange going on with your fish, do a 50% water change, vacumm the gravel and do maintenance on your filter.  Use a good water conditioner to remove chlorine/chloramine if you do a water change.
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cdale
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Re: Black Line Lengthwise on Tail
« Reply #2 on: March 16, 2012, 06:48:41 PM »

Hi welcome to the forum! Smiley
If the black was around the edge of the fins? This could be ammonia burns? You mentioned they went away, had you done a water change?
I agree with Nabi, if you don't test the water a water testing kit is essential and would help you to diagnose Smiley
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Pearlscaled
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Re: Black Line Lengthwise on Tail
« Reply #3 on: March 16, 2012, 06:52:45 PM »

I have the API test kit, and use it about once every 2-3 weeks. Everything was within proper range, the temperature was good, and the filter is working properly. I did a 50% change twice that week, as well as vacuum the gravel. My tank size is 40 gallons, which is above needed size, and has multiple live plants, with one small decoration in a corner.

The black line was right in the middle of the fin, both vertically and horizontally.

Thanks for the help, though Im still looking for what exactly it is.
Pearlscaled
« Last Edit: March 16, 2012, 06:57:02 PM by Pearlscaled » Logged
nabi
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Re: Black Line Lengthwise on Tail
« Reply #4 on: March 17, 2012, 12:32:39 AM »

The API kit is pretty accurate , so if the results are normal, then the water is probably fine. Just keep up with your regular water maintenance and do a water test once in a while.

As long as your fish is acting normally and has a good appetite, i wouldn't worry too much about it. 
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Skwishee
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Re: Black Line Lengthwise on Tail
« Reply #5 on: March 18, 2012, 05:21:58 AM »

It could have been a minor injury healing, such as a chemical burn or injury, as black spots or marks on fish often indicate healing.

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Pearlscaled
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Re: Black Line Lengthwise on Tail
« Reply #6 on: March 18, 2012, 08:07:01 AM »

Thanks for clarifying. I thought it might have been, but wasn't completely sure.
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It could have been a minor injury healing, such as a chemical burn or injury, as black spots or marks on fish often indicate healing.


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