Ladoga seal activities. The Ladoga seal is listed as an Appendix II species under the Bern Convention and also included in the Red Data Book of the Russian Federation. Ladoga seal The Ladoga ringed seal (; Pusa hispida ladogensis), is a freshwater subspecies of the ringed seal ("Pusa hispida") which are found entirely in Lake Ladoga in northwestern Russia. The subspecies evolved during the last ice age, about 11,000 years ago. As the glaciers retreated and water levels changed, the Baltic ringed seal (including Ladoga seals) was trapped in freshwater lakes and separated from the Arctic ringed seal. It is related to
Finnish Ladoga Naval Detachment losses. In the spring 1942 Finnish commander made recommendations to German leadership past Finnish HQs leading to the formation of Naval Detachment K, which included the Finnish motor torpedo boat "Sisu", to the lake. They were also joined in summer 1942 by a German unit, the Einsatzstab Fähre Ost (EFO), of armed Siebel ferries. Operations of the Naval Detachment K or EFO had very limited success. When Germany decided to withdraw its naval assets from Ladoga in late 1942, the Finns bought two of the Siebel ferries, "T-2" and "T-17". Later, when the Soviets' 1944 offensive against the Finns began,