Moon jelly (Aurelia aurita) swimming in front of an aggregation of stingless Golden jellyfish (Mastigias sp.) in a landlocked marine lake in the middle of an island. Their golden colour comes from endosymbiotic algae, which provide nutrition for the medusae, as long as the jellies stay in the sun. Farondi Islands, Misool, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean.