Re: [RML] Disease in wild-caught fish

Bruce Hansen (bhansen at ozemail.com.au)
Mon, 8 Mar 1999 22:29:02 +1000

Mostly I have found Rhads in coolish flowing soft acid streams -
occasionally in still waters and rarely in poor condition. I must admit
that they are generally in backwaters rather than in the flow proper so
perhaps a sudden increase in turbulence could be damaging but I agree that
chemical stress from a sudden large change in pH or pollutant could be the
culprit. I have found Rhads in water as low as pH 5 ( or perhaps even lower
but the test kits are generally not too good below that) so the water from
acid soils must be pretty powerful stuff

I feel that the"ratty fins" and secondary fungal infections may have been
from turbulence but parasites seem more common when fish are temporarily
confined in smaller bodies of still water between rainy seasons and are
often the intermediate stages of trematode parasites of water birds. So this
is an interesting collection of problems from the 2 opposite environmental
situations - first too little flow and then too much flow

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: Jennifer Palmer <aquamail at mypostbox.com>
To: rainbowfish at pcug.org.au <rainbowfish at pcug.org.au>
Date: Wednesday, 3 March 1999 10:19
Subject: Re: [RML] Disease in wild-caught fish