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“There is a very low possibility that any survived,” says Afanasyev, director of NAS’s Institute of Hydrobiology.

It could take a few years for the soft body parts to decompose fully, and their shells much longer, says Volodymyr Yuryshynets, a parasitologist at the Institute of Hydrobiology.

Though first observed in Turkey in 2007, sea snot appears to have periodically plagued the Mediterranean Sea since the 18th century, Özgür Baytut, a lecturer in hydrobiology at Ondokuz Mayıs University, told BirGün.

In a letter to Nature last October, Yushun Chen of the Institute of Hydrobiology in Wuhan, China, and colleagues argued that sand mining there "has destroyed crucial spawning, feeding and rearing grounds for its aquatic organisms," including the now-extinct Yangtze river dolphin and the endangered Yangtze finless porpoise.

“We are using crayfish like a living chemical laboratory – like a bio indicator and bio sensor together,” said Pavel Kozak, Director of the university’s Research Institute of Fish Culture and Hydrobiology.