These jellyfish (Mastigias sp.) inhabit a saltwater lake, and are effectively cut off from the sea. They have lost the ability to sting, and obtain all or most of their nutrition from symbiotic algae living within their tissues. (Palau, Micronesia) by David Hall
“Palau has an inland saltwater lake which is unique in the world, called Jellyfish Lake. The limestone allows an exchange of salinity with the open sea, while keeping organisms trapped. Long ago, this lake was somehow connected to the sea and Jellyfish were trapped in the lake. When the connection to the sea was broken, the Jellyfish had no natural food and few predators. They evolved into a symbiotic relationship with algae!”
Stingless jellyfish swimming in Jellyfish Lake - Palau, Micronesia | image by Lee R. Berger
The lake is notable for the millions of golden jellyfish which migrate horizontally across the lake daily. Jellyfish Lake is connected to the ocean through fissures and tunnels in the limestone of an ancient Miocene reef. However the lake is sufficiently isolated and the conditions are different enough that the diversity of species in the lake is greatly reduced from the nearby lagoon. The golden jellyfish, Mastigias cf. papua etpisoni, and possibly other species in the lake have evolved to be substantially different from their close relatives living in the nearby lagoons. | source
I have always thought jellyfish were such magical creatures. Did you know that some types of jellyfish can be immortal? If you’ve ever wondered what it would be like to swim alongside jellyfish, well you don’t have to wonder anymore because you can! At Derawan Islands in East Kalimantan, Indonesia, you can dive and swim at the Jellyfish Lake with rare stingless jellyfish. It is one of the rarest places on earth where you can experience this unique phenomenon!
Aku selalu berpikir bahwa ubur-ubur adalah mahkluk yang ajaib. Kamu tahukah bahwa ada beberapa jenis ubur-ubur yang bisa hidup abadi? Jika kamu pernah bertanya-tanya seperti apa sih rasanya berenang bersama ubur-ubur, kamu tidak perlu bertanya lagi karena kamu bisa! Di kepulauan Derawan di Kalimantan Timur, Indonesia, kamu bisa menyelam dan berenang di Danau Ubur-Ubur dengan ubur-ubur langka yang tidak menyengat. Disinilah salah satu tempat paling langka di bumi di mana kamu dapat mengalami fenomena unik ini!
Cheers, Proud Indonesian (allaboutindonesia.tumblr.com)