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Melanosis

Started by Guest_NateTessler13_* , Nov 26 2008 10:04 AM

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7 replies to this topic

#1 Guest_NateTessler13_*

Guests

Posted 26 November 2008 - 10:04 AM

Hello,
I was wondering if anyone has seen any information on Melanosis in fish. In particular, I'm looking for the causes and possible cures. Any info on the subject would be appreciated, as I haven't found much in my search so far.

-Nate

#2 Guest_az9_*

Guests

Posted 30 November 2008 - 09:14 PM

Hello,
I was wondering if anyone has seen any information on Melanosis in fish. In particular, I'm looking for the causes and possible cures. Any info on the subject would be appreciated, as I haven't found much in my search so far.

-Nate

Nate,

Are you referring to color changes such as in fish turning black?

Edited by az9, 30 November 2008 - 09:15 PM.

#3 Guest_NateTessler13_*

Guests

Posted 30 November 2008 - 10:41 PM

yes I am.

#4 Guest_az9_*

Guests

Posted 04 January 2009 - 10:19 AM

yes I am.

I've seen it in some of my fish and would like to know the causes too. If I had to make a guess I'd say the triggers could be genetic, weakend immune, over active immune system, or parasites. I do know when a fish gets one of the flukes (the one that appears to be to be black specs I can't recall the name right now) melanin deposits form around the parasite. I'm thinking that cold be a clue?

When a fish loses it's eyesight and turns black is that considered a form of melanosis?

Edited by az9, 04 January 2009 - 10:20 AM.

#5 Guest_NateTessler13_*

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Posted 08 January 2009 - 02:42 PM

I'm finding that my "melanosis" on my fish may actually be another condition (I forget the name of it) brought on by repeated chlorine exposure. I'm leaning towards that because I was having difficulty removing chlorine from my system for a short while, and if I remember correctly, that's when I started noticing more and more of the black pigmentation.

#6 Guest_hornpout_*

Guests

Posted 08 March 2011 - 03:40 PM

Check out THIS stuff!

http://www.bassfishi...read.php?t=2839

http://www.google.co...iw=1045&bih=528

These are not aquarium-raised fish, so nevermind chlorine as a possible culprit. I've been unable to find any clues as to the cause, but if you dig deep google has plenty of strange documented cases of melanism in fish. There does seem to be a correlation with fish victimized by multiple catch-and-release incidents. I'm guessing it's genetic to an extent, but requires some sort of major stress trigger. It's like if I form new birthmarks when I have my midlife crisis, I think. I dunno.

#7 Guest_gerald_*

Guests

Posted 08 March 2011 - 04:22 PM

Mycobacterium infection can cause localized skin darkening too, especially in rainbowfishes (Melanotaeniidae). Adrian Tappan's on-line Rainbowfish book on the ANGFA website discusses it (Diseases > Mycobacteriosis). Apparently the infection screws up the nerves or neurotransmitters that control melanophores. Skin darkening probably has many different causes.

#8 littlen

NANFA Member

Washington, D.C.

Posted 09 March 2011 - 01:41 PM

I have seen an adult Bullfrog with that exact color scheme, in Newport News, VA. I have pictures of it on another computer, though. This was wild frog that someone saw and we were able to capture it for a photo session. I have no explanation other than to quote Dr. Ian Malcom from Jurassic Park, "Uh, uhh, uh, Life, uhhhhh, uh...finds a way".

Nick L.