The Lake Skadar system is a well-known
hotspot of freshwater biodiversity and harbors a highly diverse mollusc fauna. It is abundant in fish, especially in
carp,
bleak and
eel. Of the 34 native fish species, 7 are
endemic to Lake Skadar. At the scale of Lake Skadar, about 31% of
freshwater snails (12 out of 39 species sampled in the lake) are endemic. At the scale of the Lake Skadar basin, 38% (19 species) of the total freshwater gastropod fauna appear to be endemic. There were reliably recorded 50 species of freshwater snails from the Lake Skadar basin. The index of freshwater gastropod endemism is 0.478. With this relatively high value, Lake Skadar exceeds
Lake Malawi and
Lake Titicaca. Lake Skadar is inhabited by five species of
Bithynia and it is a hot spot of
Bithynia evolution. There are 17
amphipod species for the Lake Skadar watershed, 10 of them being endemic (mainly from the subterranean habitat). The small range of many endemic species living in the Lake Skadar system together with ever increasing human pressure make its fauna particularly vulnerable. This becomes even more important in light of ongoing
eutrophication,
water pollution and sand and gravel exploration activities in the lake and its basin. Research of the
phytoplankton community and chlorophyll-based trophic state indices show that the lake is on a betamesosaprobic level of
saprobity, which means moderately polluted with organic compounds. Effects of human-induced environmental changes are especially evident for sublacustrine springs, with eutrophication and use for
water supply (e.g., sublacustrine spring Karuč) being the most serious threats. The 2011
IUCN Red List of Threatened Species includes 21 endemic species from the Lake Skadar basin. ==Cultural impact==