The scientists explained that harbor porpoises are the smallest and most elusive of the Bosphorus dolphins.
Porpoises skip and plunge in the wake of fishing craft laden with the day's salmon catch.
Mr Attwood said the waters off the north coast were important for harbour porpoises.
"From our preliminary results, it actually looks pretty dire for porpoises in the Baltic, " says Anna Moscrop.
On a recent outing, Dede spotted a couple of harbor porpoises in the distance, swimming past a water-side mosque.
Harbour porpoises, one of the world's smallest cetaceans, are also in danger.
The vaquita, which is also the world's smallest cetacean, is emblematic of the plight of other dolphins and porpoises around the world, say campaigners.
During the survey work, an underwater microphone called a hydrophone will be used to record the high frequency sounds of harbour porpoises and white-beaked dolphins for analysis.
The Song of the Whale crew sailed the busy fishing ground of the Baltic Sea for the first time this summer listening for signs of harbour porpoises.
In total, 28 species of dolphins, whales and porpoises have been recorded in UK and Irish waters, 12 of these during a National Whale and Dolphin Watch.
Studies of what happens to dead whales, dolphins and porpoises have been done in the UK, but only in shallow water where the worms have not yet been found.
It says there is evidence that noise is causing hearing loss in cetaceans (whales, dolphins and porpoises), injuring them and causing them to strand themselves, and is sometimes killing them.
BBC: NEWS | Science/Nature | The deafening sound of the seas
But apart from finding ways of removing the bodies of whales, dolphins and porpoises from the coastline around the UK, Ms Exelby is also responsible for dealing with reports of recovered salvage.
BBC: NEWS | UK | Wales | South East Wales | Expert help in whale stranding
At the same time, the house opposite his relatives in Little Havana shows a huge picture of the child in the sea, grasping an inner tube, surrounded by porpoises protecting him from the terrors of the deep, with the Virgin Mary behind him and the hand of God stretching down in protection.
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