The video shows the moment one big and several smaller moon jellyfish were being recorded in the waters of the Bartlett Cove dock at Glacier Bay National Park and Preserve.

The moon jellyfish, also known as the common jellyfish (Aurelia aurita) is a species of the Aurelia genus which can be naturally found in along the eastern Atlantic coast of Northern Europe and the western Atlantic coast of North America in New England and Eastern Canada. These jellyfish do not have the stinging strength to pierce human flesh, but if a person gets touched by one, they might feel a slight stinging sensation and mild irritability.

The almost completely transparent individuals are between 25–40 centimetres (10–16 in) in diameter and are easily distinguished by their four horseshoe-shaped gonads that can be seen through the top of the bell. According to online sources, individuals feed on medusae, plankton, and mollusks which they capture with their tentacles and thus transport them into their body to digest. As the common jellyfish has a restricted range of motion, it drifts with the stream even while swimming.