Keoki Stender's Upside-Down Jellyfish (Cassiopea andromeda) photo, taken at Moku O Loe, Kaneohe Bay, Oahu, 3 feet.
Upside-Down Jellyfish (Cassiopea andromeda)
Photo by Keoki Stender
This is an introduced species that is common on the silty bottom of harbors, bays, and ponds. Attains 12 inches. It will release powerful nematocysts into the water when disturbed, contains zooxanthellae and lays upside-down to expose its tentacles to the sun.