Freshwater mussels in North America are declining rapidly. Conservation of freshwater mussel communities is complicated by the fact that they depend on dispersal of their parasitic larvae on host fish. The aim of this study was to investigate the dispersal ability of the endangered freshwater mussel Epioblasma triquetra (Snuffbox) by determining displacement distance of its host fish, Percina caprodes (Logperch), during the reproductive period of E. triquetra. The study was done in a 135 m long reach, subdivided into 15 m sections, in the Sydenham River in Ontario, Canada, where E. triquetra occurs. Fish were electrofished and marked with visible implant elastomer on five sampling dates between late August and mid October. The recapture rate of P. caprodes was 15 %, with the majority of all recaptures (82 %) occurring within 30 m of their original capture, mostly 1-3 weeks after marking. The mean displacement distance of P. caprodes  was low with 13 ± 3 m (mean ± SE, n = 28). The results suggest that E. triquetra has low dispersal abilities and therefore populations are likely to have a low connectivity. In order to move ahead with mussel conservation, management strategies should consider the movement potential of host species.