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The Lake Orumieh in Iran's West Azarbaijan province has turned red as the result of an environmental phenomenon known as the "red tide."
Soap-like foam substance produced by algae started to redden Orumieh from the East Azarbaijan coast and gradually covered the whole lake.
The "red tide" is actually the result of an algal bloom, an event in which marine or fresh water algae accumulate rapidly in the water.
The effect of excessive algae on fish can be lethal. It produces oxygen radicals which can damage fish gills, possibly leading to suffocation.
Some environmentalists say the phenomenon is caused by nutrient loading from human activities or industrial and city wastewater which include nitrates and phosphates.
Other experts, however, say the algae cannot survive in the salty water of the Lake Urmia and a possible change in the salt compounds might have caused the incident.
The Salt Company of Swakopmund in Namibia was established in 1936 and operates its salt pans 10 Km north of the town on the unpolluted Benguella current of the Atlantic Ocean.
Since their activities are concentrated in an area of low rainfall at the Atlantic coastline with high evaporation rates, the logical consequence is the production of solar salt by means of evaporation pans. The seawater evaporates in successive ponds until the brine is fully concentrated and salt crystallizes on the floor of the crystallizing ponds.
The concentrating ponds will show distinct colouration, a pink or red, depending on the salt concentration and what species of plant and shrimp find it habitable.