Amazing Kakaban Lake "jellyfish without the sting"

For those of you who are fond of diving or snorkeling and wanted to play safe with jellyfish that do not sting in brackish water lake (the only two in the world) then visited Kakaban must enter your travel agenda.
Kakaban is one of a total of 31 islands belonging to the group Derawan Islands and administratively included in the district of Berau, Derawan Islands, East Kalimantan.

If you look at the map (or look up) then appears Kakaban is shaped like the number "9", with an area of approximately 774.2 hectares. The number "9" is a cluster of atolls above sea level which was formed millions of years ago.
Then, for several thousand years the appointment process occurs as a result of geological pressure. This makes the atoll rises above sea level to a height of approximately 50 meters and then make a number of sea water trapped seawater to form a lake (lagoon). This lake known as Lake Kakaban.

In the language of Bajo, kakaban means "hug".
Naming is related to the physical form Kakaban where atoll in the northern part of the "hug" and a lagoon separated from the surrounding sea water.

Lake in the middle of the sea is so beautiful turquoise clear. All around the lake to grow lush mangrove trees.

The existence Kakaban Lake is one of the main reasons tourists visit the uninhabited island.
The reason, the brackish water lake has a unique ecosystem (endemic) evolved and involves chemistry, physics, and biology are complicated and long for thousands of years.
Many researchers from within and outside the country to try to solve the mystery of how an isolated ecosystem of the lake can be home to endemic plants and animals that live in it.
Lake endemic approximately 2.6 x 1.5 kilometers is home to millions of jellyfish that have lost the ability to sting, algae into the carpet at the bottom of the lake, white anemones and jellyfish prey, fish, and other endemic biota .

There are only two brackish water lakes of this kind in the world:

• Kakaban Lake in Derawan Islands
• Jellyfish Lake in Micronesia in the southeast region of the Pacific.

There are four types of jellyfish do not sting at Lake Kakaban:

• moon jellyfish (Aurelia aurita) (5-50 cm)
• spotted jellyfish jellyfish (Mastigias Papua) (1-20 cm)
• Tripedalia cystophora (7-10 mm)
• upside-down jellyfish Cassiopea ornata (15-20 cm).

Martigias Papua is the most populous and most agile moves, while Cassiopeia is the most unique because of jellyfish is usually silent in the bottom of the lake in an inverted position / tentacles in the top position.

According to the study, the phenomenon of reverse jellyfish is one form of adaptation (read: evolution) jellyfish to survive in an isolated lake.

Jellyfish in symbiosis with algae for food. Jellyfish put algae on the legs (tentacles) and move inversely to get sunlight so that the process of photosynthesis in algae can occur.

In this way, they cook food. In addition, clear morphological changes seen in jellyfish spotted (Martigias Papua); in this lake spotted jellyfish no longer have spotted sting and sizes shrink and loss of function.

Regarding the loss of the ability of a jellyfish sting is because there are no predators that prey on the lake this endemic.

Naturally, they lose the ability to self-defense system function, ie the ability to sting. Meanwhile, anemones that inhabit this lake turned into a jellyfish predators passive. Anemones in white Kakaban lake because it was not doing symbiosis with algae.

In addition to the jellyfish, there are eight species of fish that inhabit the lake with a depth of approximately 11 meters of this.

The four most important species are:

• Serinding (Apogon lateralis)
• Puntang (Exyrias Puntang)
• Coral fry (Antherinomorus endrachtensis)
• Needle fish (Zenarchopterus dispar).

Kakaban Lake represent ancient life forms that are extreme. this is revealed by a researcher Jonathan Kindon of the Institute of Anthropology and Department of Animal Biology, University of Oxford, UK.

The existence of four species of jellyfish make Kakaban nominated as a world heritage site area (world heritage UNESCO) that should be protected.

Reportedly, Jellyfish Lake in Palau has only two species of jellyfish are similar. So no exaggeration to call the Lake Kakaban as jellyfish lake largest and richest diversity in the world.

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