Total mercury (THg) concentrations mea-sured in two freshwater shrimp species( M a c ro b r a c h i u m d e p re s s i m a n u m a n d Macrobrachium jelskii ) showed a relationship withthe location of artisanal and small-scale gold min-ing (ASGM) from the Madeira River Basin, West-ern Amazon. Between August 2009 and May 2010,212 shrimp samples were collected in the conflu-ence of the Madeira River with three of...