[3] Nemopilema nomurai caught around Tsushima and the Iki Islands have a translucent whitish body, with pinkish or reddish capulets and oral arms, and transparent immature gonads.

[6] Possible reasons for the population increase in Nomura's Jellyfish include climate change, overfishing, and coastal modification adding substrate for asexually producing polyps.

Since the beginning of the 20th century the instances of N. nomurai explosive blooms have been on the increase, a fact not helped by their size — being one of the largest species of jellyfish recorded.

Victims of a sting from the N. Nomurai jellyfish may present symptoms of itching, swelling, acute pain, local erythrosis, and inflammation; in severe cases, the envenomations can cause death.

[11] Recent research has also revealed that the myotoxicity caused by the presence of Nemopilema nomurai nematocyst venom (NnNV) in the body, which leads to Oedematogenic effects on the victims skin as well as resulting in the necrosis of the muscle tissue in some cases can be prohibited by metalloproteinase inhibitors such as batimastat (BMT) and ethylenediaminetetraacetic acid (EDTA).

Further research is in progress to determine the key factors within these protein mixtures, which could predict specific symptoms from the venom and aid in treatment.

[18] Although more research in the field is required, in recent cancer related studies it has been shown that Nemopilema nomurai jellyfish venom (NnV) can inhibit epithelial-mesenchymal transition (EMT) in HepG2 cells.

Another study aimed at using an aqueous methanol extract of dried medusa to inhibit the growth of weed seedlings when added to the soil.