Ladoga seal 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 the even smaller population of Saimaa ringed seals in Lake Saimaa, a lake that flows into Ladoga through the Vuoksi River. The adult Ladoga seal grows to
Ladoga Canal Chornoe was completed and opened to traffic in 1726. This greatly accelerated work, as the completed section was used to deliver supplies to the construction site. The locks were constructed at Shlisselburg and Novaya Ladoga to maintain the depth needed for navigation. Construction of the canal was completed on October 22, 1730, and in spring 1731 the first boats were able to sail along the canal between the Volkhov River and the Neva River (Ladoga Canal proper). It turned out that the canal had a depth of less than one metre, considerably less than envisioned by Peter I. This was