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Deployment of a Dual-frequency IDentification SONar (DIDSON) revealed the seasonal variations in spatial distribution and abundance of medusae of the common jellyfish, Aurelia aurita s.l. (detectable bell diameters: ca. !5 cm) in a shallow (max. depth: 6 m) Japanese brackish-water lake between October 2008 and October 2009. The medusae were usually in patchy aggregations, more prominently so during warm seasons. Integration of the DIDSON-detected medusae with smaller ones estimated from thedoi:10.1093/plankt/fbs057 fatcat:66l6dhbsrfhvnek2wl37pro2bu