An RSPCA spokesman said seals sometimes swim upriver following fish when there are peak high tides.
Mr Weeks, who remained with his namesake through the night, said seals tend not to eat during moulting and conserve their energy.
Michelle McIlveen of the DUP referred to the importance of Strangford as a breeding ground for common and grey seals, and said the assembly should not underestimate the importance of the mussel beds as a filtration system and as a nursery for other species.
Steve Byrne, GSPCA manager, said the seals had been driven ashore by the unseasonably rough seas.
Early viewers have said the SEALs are totally convincing in the hyper-realistic action sequences.
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He said Navy SEALs in the procession rendered first aid until authorities arrived.
Ms Bell said while grey seals do travel upriver, their bodies are adapted to salt water conditions.
"It is my understanding that the samples were received at the laboratory with all tamper resistant seals intact, " Laurenzi said.
"How Greenland sharks hunt seals remains a mystery, " Watanabe said.
Four other Navy Seals are also under investigation, US reports said.
He said the most recent examples were three seals reported dead at Cenarth.
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Mr Anstell said until a year ago, the seals were monitored by Natural England, but following funding cuts FHS was asked to take on the task of counting the seals and keeping them safe.
Scarborough Sea Life Centre said it had treated a number of birds and seals affected by the oil.
Dan Jarvis, from the Cornish Seal Sanctuary at Gweek in west Cornwall, said he is concerned the activity could discourage grey seals from using the area for breeding.
Nonetheless, his home is comfortable and seals out water and Beijing's famous dust storms, Meyer said.
Flybe said it was currently considering reintroducing the use of security seals for unattended aircraft remaining overnight in Guernsey.
Mr Byrne said islanders had donated hundreds of kilograms of fish in order to feed the seals back to health.
Every year thousands of birds, seals, dolphins and marine mammals die by swallowing or becoming entangled in rubbish, the organisation said.
"As this is a new technology, we do not know its full environmental impacts, for example on large marine animals like seals and cetaceans, and seabed species and habitats located downstream of the proposal in the lough, " she said.
BBC: NEWS | UK | Northern Ireland | Sea power to provide electricity
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