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An 'anchialine pool' is a land locked body of water connected to the ocean. Because of this, anchialine pool water levels fluctuate with the tidal changes. Anchialine pools are also connected underground to the freshwater table, so are filled with brackish water. Fewer than a thousand anchialine pools exist worldwide. They are found coastally, mostly on the island on Hawaii. This is because, to create the underground connection with the ocean, they need to have new, porous lava. Anchialine pools are home to mostly the native Hawaiian Shrimp, ''Halocaridina rubra'' (Opa'e ula). The Department of Land and Natural Resources (or DLNR) has a law in Hawaii that all stagnant water must contain guppies to control the population of mosquitoes. (''needs citation'')

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★ Anchialine Pool Information United States Geological Survey, National Park Service 2005