 Humpback chub appear to be more active at night.The population in the Grand Canyon has been previously infested with the parasitic copepod "Lernaea cyprinacea", and Asian tapeworm, "Bothriocephalus acheilognathi".Kaeding and Zimmermann also reported 13 species of bacteria, six protozoans, and the fungus Saprolegnia to infect humpback chub.