Here is a link that I borrowed from a local forum. Tells you what's going on.
http://www.reef2rainforest.com/2012/12/03/damming-the-rio-xingu-field-update/
http://www.reef2rainforest.com/2012/12/03/damming-the-rio-xingu-field-update/
Time to hoard those fish from the lower xingu and breed them.
Time to hoard those fish from the lower xingu and breed them.