A wide range of parasites manipulate the behaviors of their hosts as their extended phenotypes to complete their life cycle. Alteration of phototaxis is involved in host manipulation in many taxa, such as zombie ant fungi, baculoviruses and acanthocephalan. Even though the day/night and lunar cycle shape the light environment in nature, it remains largely unexplored whether host manipulation could also occur in response to these light cycles. Parasitic nematomorphs manipulate their terrestrial insect hosts to enter the water. Nematomorphs infecting diurnal insect hosts, mantis, were shown to manipulate their terrestrial hosts by inducing positive phototaxis to reflected light from water surfaces. Because reflected light intensity from water surfaces at night changes with the lunar cycle, the water-entry behavior of nocturnal hosts may increase during the full moon and decrease during the new moon. However, this could cause the nematomorphs to lose time available for manipulating the hosts, resulting in a loss of mating opportunity. Alternatively, the water-entry behavior of the hosts may not depend on the lunar cycle with the manipulation mechanisms other than the alteration of phototaxis. Here, we tested whether nematomorph parasites manipulate nocturnal hosts according to the lunar cycle by examining temporal changes in the number of nocturnal hosts (camel crickets) that entered ponds and the ingestion rate of those host insects by fish consumers in a stream. The presumed hosts entered the ponds on both new and full moon days. Additionally, the number of presumed hosts ingested by stream fish did not differ between new and full moon days. These results imply that nematomorph parasites may have evolved fine-tuned mechanisms of host manipulation depending on whether the host is diurnal or nocturnal. More broadly, these results raise a research question for understanding conserved and alternative mechanisms in the evolution of parasites for manipulating their respective hosts.