Editing Lake Ladoga (section)

==Wildlife==
The Ladoga is rich with fish. 48 forms (species and infra specific taxa) of fish have been encountered in the lake, including [[Rutilus|roach]], [[carp bream]], [[zander]], [[European perch]], [[ruffe]], endemic variety of [[smelt (fish)|smelt]], two varieties of ''[[Coregonus albula]]'' (vendace), eight varieties of ''[[Coregonus]] lavaretus'', a number of other [[Salmonidae]] as well as, albeit rarely, endangered [[Atlantic sturgeon]] (formerly confused with [[European sea sturgeon]]). Commercial fishing was once a major industry but has been hurt by overfishing. After the war, between 1945 and 1954, the total annual catch increased and reached a maximum of 4,900 tonnes. However, unbalanced fishery led to the drastic decrease of catch in 1955–1963, sometimes to 1,600 tonnes per year. [[Trawling]] has been forbidden in Lake Ladoga since 1956 and some other restrictions were imposed. The situation gradually recovered, and in 1971–1990 the catch ranged between 4,900 and 6,900 tonnes per year, about the same level as the total catch in 1938.<ref>{{cite journal | last1 = Kudersky | first1 = Leonid K. | display-authors = etal | year = 1996 | title = Fishery of Lake Ladoga — past, present and future | journal = [[Hydrobiologia]] | volume = 322 | issue = 1–3| pages = 57–64 | doi = 10.1007/BF00031805 | s2cid = 43547080 }}</ref> Fish farms and recreational fishing are developing.<ref>{{cite web| url = http://ladoga.krc.karelia.ru/resources/fish/index.shtml| title = Ladoga| access-date = 2007-01-29| archive-date = 2020-01-17| archive-url = https://web.archive.org/web/20200117083942/http://ladoga.krc.karelia.ru/resources/fish/index.shtml| url-status = live}}</ref>

It has its own [[endemic (ecology)|endemic]] [[ringed seal]] subspecies known as the [[Ladoga seal]].

Since the beginning of the 1960s Ladoga has become considerably [[eutrophic]]ated.<ref>{{cite journal | last1 = Holopainen | first1 = Anna-Liisa | display-authors = etal | year = 1996 | title = The tropic state of Lake Ladoga as indicated by late summer phytoplankton | journal = [[Hydrobiologia]] | volume = 322 | issue = 1–3| pages = 9–16 | doi = 10.1007/BF00031799 | s2cid = 30122757 }}</ref>

[[Nizhnesvirsky Natural Reserve]] is situated along the shore of Lake Ladoga immediately to the north of the mouth of the [[River Svir]].

The Ladoga has a population of [[Arctic char]] that is genetically close to the [[Sommen charr|chars of Lake Sommen]] and [[Vättern|Lake Vättern]] in southern Sweden.<ref name=Hammar2014>{{cite journal |last1=Hammar |first1=J. |date=2014 |title=Natural resilience in Arctic charr ''Salvelinus alpinus'': life history, spatial and dietary alterations along gradients of interspecific interactions  |journal=[[Fish Biology]] |volume=85 |issue=1 |pages=81–118 |doi= 10.1111/jfb.12321 |pmid=24754706|bibcode=2014JFBio..85...81H }}</ref>