ISTANBUL, June 10 (Xinhua) -- Turkish cleaning crews have collected nearly 400 cubic meters of marine mucilage, also known as "sea snot," from the Marmara Sea during the last two days, the state-run Anadolu agency reported Thursday.
The cleaning activities were conducted in 31 locations on the sea in several provinces along the Marmara Sea, including Istanbul, Bursa, Canakkale, Kocaeli, and Tekirdag, according to Anadolu..
The operation has been continuing with the participation of 1,000 personnel, it said.
On Tuesday, Turkey launched its largest and most comprehensive sea cleaning campaign to remove mucilage that threatens sea creatures and ecological life.
The substance was first seen on Istanbul's shores on the Marmara Sea and later expanded to the northern Aegean Sea and a small part of the Black Sea.
According to experts, the thick jello-like layer has been killing sea life slowly as it has significantly reduced the oxygen level under the sea surface.
Scientists say this phenomenon is not new, but has become massive because of pollution, such as raw sewage running-offs from Istanbul and coastal cities to the sea.