C. nigromaculata - Report by Dr. Stuart Willis
We fished for these all through the upper Orinoco and Casiquiare, mostly in the Mavaca and Pamoni.  They are most common in lagoons, especially floodplain lagoons (seasonally isolated/connected), although they can be found sporadically in the channel. These don't show any particular observable habitat use differences to C. monoculus.  We caught these on weedless spoons and in-line spinnerbaits.