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Invertebrates

The lake hosts a rich endemic fauna of invertebrates. The copepod Epischura baikalensis is endemic to Lake Baikal and the dominating zooplankton species there, making up 80 to 90% of the total biomass. It is estimated that they filter as much as a thousand cubic kilometers of water a year, or the lake's entire volume every twenty-three years.

Among the most diverse invertebrate groups are the amphipod and ostracod crustaceans, freshwater snails, annelid worms and turbellarian worms: