The Japanese sleeper ray (Narke japonica) is a species of electric ray in the family Narkidae. It is common in the inshore and offshore waters of the northwestern Pacific Ocean from southern Japan to southern China. Growing up to 40 cm (16 in) long, the Japanese sleeper ray has a nearly circular pectoral fin disc colored reddish to chocolate brown above, sometimes with darker or lighter spots, and lighter brown below. The spiracles behind its small eyes have raised, smooth rims. Its short and muscular tail bears a single dorsal fin positioned aft of the rounded pelvic fins, and terminates in a large caudal fin.
Inhabiting shallow, sandy areas near rocky reefs, the Japanese sleeper ray is a bottom-dwelling predator of invertebrates. Like other members of its family, it can produce a strong electric shock from its electric organs for defensive purposes. Females give live birth to litters of up to five pups. The gestating young are sustained at first by yolk, and later by histotroph ("uterine milk"). The International Union for Conservation of Nature (IUCN) has listed this species as Vulnerable, due to its susceptibility to trawl fisheries that operate intensively throughout its range.
^ abRigby, C.L.; Chen, X.; Ebert, D.A.; Herman, K.; Ho, H.; Hsu, H.; Zhang, J. (2021). "Narke japonica". IUCN Red List of Threatened Species. 2021: e.T201629258A201629674. doi:10.2305/IUCN.UK.2021-2.RLTS.T201629258A201629674.en. Retrieved 20 November 2021.
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