Bill, I read you post twice. Seriously good information there. Thank you! Let me see if I can get some useful information on the ponds turbidity. In the center is is 4' deep and 7' at the dam if I remember right. (it's posted above)

FWIW, I have found out that a common local variety of fish called Charal is what was put into the pond.

Since they are native to Mexico, there isn't much written on them in English. So here is the Wikipedia article translated by Google: Charal

I am tracking down FHM now.