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RE: Rachovii

Thanks RJ.  The eye fungus has cleared up, whether due to anything I did or
not I can't say.  I have broken up the group into two additional 10s.  They
are 1/2 inch long and just starting to color up.

-----Original Message-----
From: Tranquility Base [mailto:TranquilityBase at NetZero_Net]
Sent: Thursday, January 31, 2002 10:40 PM
To: killietalk at aka_org
Subject: RE: Rachovii


The maximum stable density for adult RAC is 1 fish per gallon. I have just
run a test to that effect. The population will die back to that level if
nothing is done. Then the remaining fish grow and color up very well.
Unexplained deaths just stop.  The bad news is that the sex ratios will
favor males which are stronger and larger over females which will grow more
slowly when overcrowded. Water changes, medication and plant cover will
postpone the inevitable and will permit a slightly higher density.

Peace,

~RJ~

-----Original Message-----
From: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]On
Behalf Of Morris, George
Sent: Thursday, January 31, 2002 12:34 PM
To: 'killietalk at aka_org'
Subject: RE: Rachovii


Barry,
No the eyes are not protruding, just covered with white fuzz.  The tank is a
ten and I change 25% once a week.  The fish just starting to color up, I
don't think they are over crowded.
George

-----Original Message-----
From: Barry Cooper [mailto:bjc3 at cornell_edu]
Sent: Thursday, January 31, 2002 11:26 AM
To: killietalk at aka_org
Subject: Re: Rachovii


George,

I assume these fish are manifesting "pop-eye". This is typically caused by
bacterial infection. In my own expereience, where I've looked at affected
fish histologically, it is usually due to mycobacterial infection and
reflects more widespread disease (in other words other tissues are
infected). The inflammatory exudate behind the eye causes it to protruce,
hence the common name.

I would cull the infected fish and look carefully at the conditions they are
housed in. How big is the tank housing them. How often is the water changed.
The most common situation in which one gets these infections is where
organics from wastes have built up.

Barry

At 07:20 AM 1/31/2002 -0600, you wrote:
>Good morning everyone.   I have a tank with about 30  month-old N. rachovii
>and several of the males have developed a bactereial or fungal infection on
>one eye.  I don't know if this is something I've never seen before or an
>unusual manifestation of columnaris or something.  Have any of you had
>experience with this?
>Regards,
>George Morris
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___________________________________________________
Barry J. Cooper, Prof., Dept. Biomedical Sciences, Cornell University
Current address: 27505 Riggs Hill Rd.
Sweet Home, OR 97386 (bjc3 at cornell_edu)

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