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Batrachochytrium dendrobatidis(Bd) is a pathogenic fungus known to infect amphibians and crayfish. In crayfish,Bdcauses gill tissue damage, and in some cases, mortality. Most research has focused on the amphibian-Bdsystem, so to date, little is known about the effects ofBdon the crayfish host. Here, we studied the effects of sublethal exposure toBdand the metabolites produced byBdon crayfishProcambarus allenisurvival, gill damage, and oxygen consumption (as a proxy for mass-specific metabolic rate). Oxygen consumption increased 24 h post-exposure to liveBd, indicative of a stress response, followed by a decrease in oxygen consumption over time (χ²₁= 6.39, p = 0.012). There was no difference in response when comparing the crayfish exposure to liveBdandBd-metabolites alone (χ²₁= 2.70, p = 0.101), indicating that the metabolites may have been the causative agent responsible for the response. Additionally, oxygen consumption decreased with gill damage (tissue recession) inBd-exposed individuals. We found that high doses ofBdcause outright mortality in crayfish, and we show here that sublethalBd-induced inhibition of oxygen consumption could negatively impact crayfish in the field, possibly reducing their overall fitness. More research is needed to understand this understudied host-parasite system. It is essential that we incorporate the disease dynamics associated withBdand crayfish in conservation disease models, as this is the only way to develop comprehensive community-based models.