
© Bulent Kilic/AFP/Getty ImagesThe Bosphorus strait in Istanbul has turned turquoise due to phytoplankton.
Transformation of the usually blue waters of the Bosphorus is not caused by pollution, say scientistsA sudden change in the colour of the Bosphorus Strait that divides the continents of Europe and Asia in Turkey's largest city Istanbul has surprised residents, with scientists putting it down to a surge in a species of plankton across the Black Sea.
The sudden transformation of the usually blue waters of the Bosphorus to a milky turquoise since the weekend had alarmed some residents.
Some took to social media to express fears that there had been a pollution spill while others even suggested it could be linked to an earthquake that rocked the Aegean region on Monday afternoon.
But scientists said there was no mystery behind the colour change, which was accompanied by a sharper smell.
Ahmet Cemal Saydam, professor of environmental science at Hacettepe University, told the Dogan news agency that the cause was a surge in numbers of the micro-organism
Emiliania huxleyi, also known as Ehux.
"This has nothing to do with pollution," he said, adding it was particularly good for the numbers of anchovies, a popular supper in Istanbul.
Comment: Plankton growing rapidly in ocean seen as sign of carbon dioxide loading