White-spotted jellyfish (Phyllorhiza punctata) in Shark Bay, Western Australia.

Bluebottle (Physalia utriculus) at sunset in Port Stephens, NSW.

White-spotted jellyfish (Phyllorhiza punctata) photographed in Shark Bay, Western Australia.

Unknown crown jellyfish in Shark Bay, Western Australia.

Jelly blubber (Catostylus mosaicus) in Port Stephens, New South Wales

A pink jellyfish in the subantarctic waters of Macquarie Island.

Jelly blubber (Catostylus mosaicus) in Walagoot Lake, New South Wales.

Red bell jellyfish (Crambione mastigophora) on Ningaloo Reef, Western Australia.

Jelly blubber (Catostylus mosaicus) sheltering juvenile fish (most likely trevally) on the Great Barrier Reef, Queensland.

White-spotted jellyfish (Phyllorhiza punctata) in Shark Bay, Western Australia.