common jellyfish or moon jelly, group of aurelia aurita at the brackish water of the baltic sea, maritime wildlife, medusa

jellyfish moon jelly aurelia aurita baltic sea brackish water medusa maritime gelatinous common wildlife underwater ocean biology life fluorescent group intervertebral glowing blue light fish umbrella transparent nature translucent saucer animal animals caspian estuary salt seawater brack northwest pacific habitat rings four harmless tentacles irritation species creature natural wildlifes