RV Platessa tagged plaice were released off the Cumberland coast, using the RV "Platessa" during 1949 and 1950. In August 1951 echo-sounder traces were obtained over a wide area off Whitby by the RV 'Platessa', using a Marconi sounder. They were found to occur at a depth corresponding to that of a sharp thermocline, and small whiting about 3 in. in length, large Medusae, herring and sandeel larvæ were caught with a pelagic trawl at the depth of the trace. This work was reported in a ‘letter’ to the journal Nature in 1952. In 1950 the RV "Platessa" was involved in comparative
Eclecta aurorella by a slender white line. There is an irregularly triangular dark reddish-fuscous blotch, more ochreous-fuscous beneath, on the hindmargin, its apex extending to the disc at three-fifths from the base, its base extending from above the anal angle to beneath the apex, the lower side suffused, upper side connected in the disc with a dark reddish-fuscous acute diamond-shaped mark beneath the costa, beyond the connection margined with white. Within this triangle is a slender white twice sharply-toothed line proceeding from the middle of the upper side to the lower angle, and two small indistinct whitish spots on the hindmargin. The