Underwater video of Gymnogeophagus aff. meridionalis foraging

I shot this video March 2010 in Arroyo de la Invernada (the headwaters of the Rio Cuareim). G. meridionalis occur in the Rio Uruguay and in the lower and middle Rio Cuareim, but here in the headwaters there appears to be a transition to a different species (so I refer to them as G. aff. meridionalis). 

To compare, you can view the true G. meridionalis in the lower Rio Cuareim here

E.D.B.