"It was beginning to roll and the dorsal fin was falling over somewhat, " he said.
BBC: NEWS | UK | Northern Ireland | Tide dashes hopes of moving whale
Passengers emerge onto the decks, leaning over the rail in the hope of spotting a telltale dorsal fin.
Quite often people think it's a shark because of the big dorsal fin.
There is a thinner engine cover, which has a slight dorsal fin appearance.
The star of the show is a whole rouget, served dorsal fin upward as if the fish were still swimming.
We heard the expelling of air through a blowhole and tracked down a humpback, watching as her dorsal fin arched out of the water.
The whales are jet-black in color and have no shark-like dorsal fin.
Borrowman pointed out a distinctive pale-grey saddle patch behind the dorsal fin and identified the orca as one he sees frequently: a 43-year-old male known as A38.
Facebook billionaire investor, Peter Thiel, clips off a small piece of cartilage, musician, Imogene Heap, plants an electric tag just below the dorsal fin.
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If you watch closely, you can see them from the shores of Istanbul: The sudden flash of a dark grey dorsal fin cutting through the water.
The truly nasty fluttering of the gills was achieved by another man, out of shot, pumping air through a tube into bladders on Mr Chapman's dorsal fin.
Every few seconds, the creature's head or dorsal fin would poke through the murky waters, creating ripples and drawing murmurs from onlookers, who stood in the cold with cameras.
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