Aplysia punctata (Cuvier, 1803)

21 June , 2009.
Weasel Loch, Eyemouth on the east coast. 
A couple of 65 mm animals mating while one continues to spawn at 6 m. There were many animals around this depth, mating and spawning.
Water temperature 10.5°C.
Fuji E900 in Ikelite housing with Inon CU lens and 2 x Inon D-2000 flashes.

for more information about this species go to one of the links below
OPK - Opistobranquis

Encyclopedia of Marine Life of Britain and Ireland sea slug forum