Thanks - Indeed I have (and know Ed - we've been to Uruguay together).
Here's someone who has bred Uruguayan pikes if you haven't read it yet.
Crenicichla celidochilus in cool-period: before and during
My Uruguayan fish have been in their cool period for about a month now. All of their tanks are unheated. This particular tank is placed on an exterior wall, beside a door, in my fishroom so the temperature drops relative to the external temperature. Anyway, here a a few shots of the females...www.monsterfishkeepers.com