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PENCZAK, Tadeusz; AGOSTINHO, Angelo Antonio; GLOWACKI, Lucasz; GOMES, Luiz Carlos. The effect of artificial increases in water conductivity on the efficiency of electric fishing in tropical streams (Paraná, Brazil). Hydrobiologia, Dordrecht, v.350, no.1-3, p.189-201, 1997. Four sites in three small tropical streams each were sampled with three successive electrofishings per constant unit effort, starting at the site with lowest natural water conductivity. Each second-fourth site was sampled at double water conductivity (up to 300 µS cm-1 only) by dissolving salt in the water. Electric fishing efficiency estimated by three efficiency indexes was not significantly correlated with increasing conductivity. The reasons for this result are discussed.