Jellyfish system. Nematocysts, which deliver the sting, are located mostly on the tentacles; true jellyfish also have them around the mouth and stomach. Jellyfish do not need a respiratory system because sufficient oxygen diffuses through the epidermis. They have limited control over their movement, but can navigate with the pulsations of the bell-like body; some species are active swimmers most of the time, while others largely drift. The rhopalia contain rudimentary sense organs which are able to detect light, water-borne vibrations, odour and orientation. A loose network of nerves called a "nerve net" is located in the epidermis. Although traditionally thought
Jellyfish Entertainment working together. In October 2016, Jellyfish Entertainment announced that former Dal Shabet member Jiyul, signed a contract with the agency in order to pursue her career as an actress. In November 2016, former Jewelry member Kim Ye-won, joined Jellyfish Entertainment as an actress. On December 13, 2016, Jellyfish Entertainment released their "Jelly Christmas 2016" single album with the song, "Falling" (), as part of their digital music channel project "Jelly Box". The Jellyfish artists participating were Seo In-guk, VIXX, Gugudan, Park Yoon-ha, Park Jung-ah, Kim Gyu-sun, Kim Ye-won and Jiyul. In April 2017, agency trainee Yun Hee-seok represented Jellyfish Entertainment