The star-spotted smooth-hound has a triangular mouth with a large amount of small and interconnected teeth.

[3] The star-spotted smooth-hound is mainly found around the coastal waters of the northwest Pacific Ocean, ranging from southern Russia in the north to Brunei in the south, but some are also found in the coastal waters of Kenya in Africa.

[1][3] In addition, there are unconfirmed sightings of star-spotted smooth-hound recorded in the Andaman Sea and in the coastal waters of Madagascar and Bangladesh.

They also occasionally prey on annelids, brittle stars, cephalopods, shellfish, and small fishes.

[4][5] Some studies have pointed out that the stomach content weight of star-spotted smooth-hound in Tokyo Bay waters has a downward trend, which may be due to the decline in the benthic invertebrate populations on which they feed on.

[5] The star-spotted smooth-hound is ovoviviparous and usually mates between May and August,[6] giving birth to 2 to 6 young sharks in one litter, with a gestation period of about 10 months.

Although some countries have policies such as restrictions on fishing activities at certain times of the year, there is no special conservation measurement for this species.

The IUCN 2020 report estimated that the population of star-spotted smooth-hound has declined by 50% to 79% in the past 33 years, and it is therefore rated as Endangered.