Dunno but there is a seal which frolics off the ends of the piers in the Eastern Docks every morning. The ferries swing there and I presume that he breakfasts on what they stir up.
The seal was on the Hoverport pad the other day basking in the sun, will be a bit noisy there at times this week as I hear there are going to be some helicopter flights to the open from there.
i did wonder if it was a seal but after 10 minutes without moving i was undecided, i didn't know whether it is normal for them to stay so still in the water.