Jellyfish Lake

Aerial view, looking west
Stratification diagram
Aerial view of Jellyfish Lake, looking out to sea
Golden and spotted jellyfish comparison. Note the loss of spots, color and greatly reduced clubs in the golden jellyfish from Jellyfish Lake
Map of Eil Malk with Jellyfish Lake in the eastern part of the main island
A swimmer snorkeling in Jellyfish Lake.

Marine lake located on Eil Malk island in Palau.

- Jellyfish Lake
Aerial view, looking west

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Jellyfish

Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria.

Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria.

A purple-striped jellyfish at the Monterey Bay Aquarium
Fossil jellyfish, Rhizostomites lithographicus, one of the Scypho-medusae, from the Kimmeridgian (late Jurassic, 157 to 152 mya) of Solnhofen, Germany
Stranded scyphozoans on a Cambrian tidal flat at Blackberry Hill, Wisconsin.
The conulariid Conularia milwaukeensis from the Middle Devonian of Wisconsin.
Labelled cross section of a jellyfish
Anatomy of a scyphozoan jellyfish
Discharge mechanism of a nematocyst
The lion's mane jellyfish (Cyanea capillata) is one of the largest species.
Jellyfish locomotion is highly efficient. Muscles in the jellylike bell contract, setting up a start vortex and propelling the animal. When the contraction ends, the bell recoils elastically, creating a stop vortex with no extra energy input.
Moon jellyfishes can live in northern hemisphere seas, such as the Baltic Sea.
A common Scyphozoan jellyfish seen near beaches in the Florida Panhandle
Global harvest of jellyfish in thousands of tonnes as reported by the FAO
Rehydrated jellyfish strips with soy sauce and sesame oil
The hydromedusa Aequorea victoria was the source of green fluorescent protein, studied for its role in bioluminescence and later for use as a marker in genetic engineering.
Pacific sea nettles (Chrysaora fuscescens) in an aquarium exhibit
Box jellyfish are small and venomous.
Jellyfish dermatitis

Some jellyfish populations have become restricted to coastal saltwater lakes, such as Jellyfish Lake in Palau.

Goby Lake

Marine lake located on Koror island in Palau.

Marine lake located on Koror island in Palau.

Goby Lake is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Clear Lake (Palau), Uet era Ngermeuangel, Uet era Ongael.

Eil Malk (Mecherchar)

Clear Lake (Palau)

Marine lake located on Eil Malk island in Palau.

Marine lake located on Eil Malk island in Palau.

Eil Malk (Mecherchar)

Clear Lake is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Goby Lake, Uet era Ngermeuangel, Uet era Ongael.

Uet era Ngermeuangel

Marine lake located on Koror island in Palau.

Marine lake located on Koror island in Palau.

Uet era Ngermeuangel is notable for endemic subspecies of golden jellyfish and is one of five marine lakes in Palau used for several scientific researches in evolutionary biology the other lakes being Jellyfish Lake, Clear Lake (Palau), Goby Lake, Uet era Ongael.

Spotted jelly

Species of jellyfish from the Indo-Pacific oceans.

Species of jellyfish from the Indo-Pacific oceans.

The most famous spot to admire these organisms is the Ongeim’l Tketau Lake in Palau.

Hutt Lagoon, Australia

Marine lake

Lake situated very close to the sea, which has a connection to this sea, via tunnels or cracks in the soil.

Lake situated very close to the sea, which has a connection to this sea, via tunnels or cracks in the soil.

Hutt Lagoon, Australia

A notable marine lake is Ongeim’l Tketau, in Palau, known for its vast numbers of jellyfish, to which it owes its nickname, Jellyfish Lake.

Aerial view of Rock Islands.

Rock Islands

Incorporated part of Koror State.

Incorporated part of Koror State.

Aerial view of Rock Islands.
View of Rock Islands from the lagoon.
Divers descending next to the mast of the Japanese tanker Iro.
An Anemonefish on the wreck of the Japanese tanker Iro.
One of the many Rock Islands.

The islands and surrounding reefs include Palau's most popular tourist sites, such as the Blue Corner, Blue Holes, German Channel, Ngermeaus Island, and the famed Jellyfish Lake, one of many marine lakes in the Rock Islands that provides home and safety for several kinds of stingless jellyfish found only in Palau.

McGinnis Lake is a meromictic lake within the Petroglyphs Provincial Park.

Meromictic lake

Lake which has layers of water that do not intermix.

Lake which has layers of water that do not intermix.

McGinnis Lake is a meromictic lake within the Petroglyphs Provincial Park.
Lac Pavin in France is a meromictic crater lake.
Typical mixing pattern for a dimictic lake. This does not occur in meromictic lakes
Strandvatnet in Nordland down to the left; only a small isthmus separates the lake from Ofotfjord.
Lac du Bourget is the largest and deepest lake in France
Green Lake is a meromictic lake near Syracuse, New York.
Sunfish Lake is a meromictic lake near Waterloo, Ontario.
Big Soda Lake is a meromictic lake in a volcanic crater near Fallon, Nevada
Soapy foam on the shore of Soap Lake in Washington
Lake Pakasaivo, a meromictic lake in Muonio, Finland

Jellyfish Lake (Ongeim'l Tketau), on Eil Malk in Palau

Mastigias

Genus of true jellyfish in the family Mastigiidae.

Genus of true jellyfish in the family Mastigiidae.

Mastigias papua

Members of this genus are found widely in coastal regions of the Indo-Pacific, including saline lakes of Palau (e.g., Jellyfish Lake), but there are also records from the West Atlantic at Florida and Puerto Rico.

Eil Malk (Mecherchar)

Eil Malk

Main island of the Mecherchar Islands, an island group of Palau in the Pacific Ocean.

Main island of the Mecherchar Islands, an island group of Palau in the Pacific Ocean.

Eil Malk (Mecherchar)

Most well known is the Jellyfish Lake in the east of the island.