Suspect TB (Mycobacteriosis) until another answer is forthcoming - Tris are
most susceptible to this and Goyders are more susceptible than other morphs
in my experience
Remember that Tb doesn't necessarily present with the same pattern in each
victim so if you can preserve the specimen in alcohol and arrange an
autopsy - a definite answer can prepare you for appropriate action for your
other fish as well as your own health protection.
Other causes of this pigment abnormality include injury and thyroid and I
think other endocrine disturbances
Regards,
Bruce.
Bruce Hansen, A.N.G.F.A., Advancing Australian Aquatics.
Bruce Hansen, ANGFA, caring for our aquatic ecosystems.
Please visit us at http://www.ozemail.com.au/~fisher/angfa.htm
----- Original Message -----
From: Simon, Dan <dan.simon at attws.com>
To: 'RSG mail' <rainbowfish at pcug.org.au>
Sent: Saturday, 22 May 1999 1:20
Subject: [RML] Sudden death
> I lost a adult M. trifasciata (Goyder river) last night. It had a
darkened
> area (almost black) on one side from the tip of its snout past the eye and
> up to the start of the dorsal fin. This "triangle area" was only on the
> right side. The area followed one side of the nose stripe in a very
defined
> area. The fish ate but was not real active for two days. I removed him
and
> isolated it in a quarantine tank yesterday but upon inspection this am, he
> had expired.
>
> All others in the display tank do not exhibit any of the symptoms. I'm
> concerned about possible infection spreading to the others. Any ideas as
to
> the cause of death ?
>
> Thanks,
>
> Dan
>