MARINElife survey report: Dover-Calais 21 March

21 March 2026

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The morning was bright and sunny as I drove into Dover and met up with Holly, my fellow surveyor. We collected our port passes and made our way to the DFDS check-in and then on to the ferry.

Once aboard the Cote des Flandres, we reported to the information desk and were taken up to the bridge, where the captain and crew made us welcome as we settled down out of the way while the vessel was unmoored and made its way out of the harbour.

Our survey then began, quietly at first, with low numbers of Gannet and Great Black-backed Gull. Four corvids were also spotted soon after departure, heading for Dover. It was tempting to wish they were Chough, a rare species which is currently becoming established on the Dover cliffs, but the birds were too far away to allow identification.

4th year Gannet (Library photo: Peter Howlett)

Among the early Gannet were third-, fourth- and fifth-year immature birds, as well as adults in breeding plumage.

Around mid-Channel, we spotted our first terns of the survey, including a Sandwich Tern, and our first Kittiwake, which were then sighted frequently for the remainder of the outward voyage.

As we neared Calais, a small flock of Common Scoter flew past the ship in the swift, direct manner characteristic of these dark sea ducks. Two Shag were then observed on the water as we headed into the harbour.

Once unloaded and re-loaded, the Cote des Flandres set sail once more, manoeuvring out of the harbour and back into the English Channel for the return crossing and the second leg of our survey.

On the way back to Dover, Gannet and Kittiwake were again the most numerous species, and both were recorded in higher numbers. Small numbers of auk, including Guillemot, were sighted in flight and on the water.

Harbour Porpoise (Library photo: Peter Howlett)

With the sea state increasing as we crossed the Strait, the likelihood of spotting cetaceans appeared to be diminishing. Then a dark shape was glimpsed among the waves ahead of the vessel, followed by the sight of two Harbour Porpoise surfacing and disappearing several times as they crossed our bow.

Closing in on Dover, we added Common Tern and a diver to our bird list before concluding the survey as we entered the harbour.

Our thanks to DFDS, Captain Blanquart, his officers and crew for their warm welcome and for facilitating our survey.

Pat Hatch and Holly Kembrey, Research Surveyors for MARINElife (Registered Charity No. 1110884; Registered Company No. 5057367)

Weather

Outbound – Moderate visibility, overcast, wind ENE force 5-6

Return – Moderate visibility, clear sky, wind NNE force 5-6

Summary of sightings

Seabirds

Common Scoter Melanitta nigra 5

Common Tern Sterna hirundo 1

Gannet Morus bassanus 55

Great Black-backed Gull Larus marinus 5

Guillemot Uria aalge 2

Herring Gull Larus argentatus 2

Kittiwake Rissa tridactyla 74

Lesser Black-backed Gull Larus fuscus 1

Sandwich Tern Sterna sandvicensis 1

Shag Gulosus aristotelis 2

Diver sp. 1

Larus sp. 11

Tern sp. 5

Auk sp. 8

Terrestrial Birds

Crow sp. 4

Marine Mammals

Harbour Porpoise Phocoena phocoena 2