 Ovulating and gravid females are rarely ever caught, suggesting that during this period, they may stop feeding or segregate themselves from others of their species.Potential predators of the night shark include larger sharks.Known parasites include the copepods "Kroyeria caseyi", which attach to the gills, "Pandarus bicolor" and "P. smithii", which infest the skin, and the tapeworms "Heteronybelinia yamagutii", "H. nipponica" and "Progrillotia dollfusi", which are found in the spiral valve intestine.