Several biomarker enzymes such as catalase (CAT) and glutathione S-transferase (GST) can be used to measure oxidative stress in animals caused by exposure xenobiotics. The objective of the present study was characterize different points Capivari (CP1 CP2), Paraguaçu (PG1 PG2) Subaé (SB1 SB2) Rivers, state Bahia, relation presence xenobiotics, using CAT GST bioindicators M. jelskii. water-sampli...