If it's about fish in general, or it's a little bit random, then this is the place to post it.
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Somewhere here I posted the closest thing I had seen to the params. I got them from a link in a thread on PC. Basically the reading were taken in the Xingu near Altamira which is s bit upstream from where zebras have been collected in the big bend. The readings were taken once for each season but they were taken 12 years apart by two different people. This post was made on thekrib.com in 2000. The conductivity readings translate to TDS of approximately 14 for the low and 80 for the high.
From http://www.thekrib.com/Apisto/A-xingu.htmlStawikowski recorded the following conditions for the Xingu near Altamira in September 1988 (low water): pH 6.5, 1º dGH, 1º dKH, e.c. 120µS/cm @ 32ºC (90ºF). Lacerda measured the Xingu in about the same location in March 1996 (high water) as follows: pH 6.7 - 6.9, e.c. ~20µS/cm.
The water temperature was cooler, probably around 80ºF. The upper Xingu was studied by Lowe-McConnell (this is the paper Pete mentions) and she reports similar hardness & conductivity values. The pH was considerably lower, pH 5.0-5.1, but this wasn't in the main channel.
What makes the common person uncommon is common sense.