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Most of Dakar's wastewater is discharged, without treatment, into the Atlantic Ocean. [16] The Cambérène wastewater-treatment plant, Senegal's largest, treats about 15 percent of the wastewater generated in Dakar. Since 2007, the station has been operated and expanded by the French company SAUR. Some of the treated wastewater is being reused ...
Doctor fish cleaning a bather's feet Some spas provide large fish ponds with thousands of doctor fish in them Doctor fish facilities at spa resorts exist in many countries worldwide. In 2006, doctor fish spa resorts opened in Kangal , Turkey, Hakone , Japan, and Umag , Croatia, where the fish are used to clean the bathers at the spa.
Water supply and sanitation in Japan is characterized by numerous achievements and some challenges. The country has achieved universal access to water supply and sanitation, has one of the lowest levels of water distribution losses in the world, regularly exceeds its own strict standards for the quality of drinking water and treated waste water, uses an effective national system of performance ...
Fish are frequently the top level predators in a managed treatment eco-system and in some case may simply be a mono-culture of herbivorous species. Management of multi-species fisheries requires careful management and may involve a range of fish species including bottom-feeders and predatory species to limit population growth of the herbivorous ...
Following Henry's law, as water becomes warmer, oxygen becomes less soluble in it. This property leads to daily anoxic cycles on small geographic scales and seasonal cycles of anoxia on larger scales. Thus, bodies of water are more vulnerable to anoxic conditions during the warmest period of the day and during summer months.
Brackish water refers to aquatic environments that have a salinity in between salt and fresh water systems. Cleaning symbiosis has also been observed in these areas between two brackish water cichlids of the genus Etroplus from South Asia.
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