biostudies-literatureUnknown60Jaspers CThe biodiversity and distribution of gelatinous macrozooplankton was assessed in the Baltic Sea during September 2020. The dataset includes 40,601 species-specific gelatinous macrozooplankton records, representative of 236,329 gelatinous organisms caught across 73 stations in the south-western, central and northern Baltic Sea. Focus was devoted to changes in depth distributions in relation to salinity and an extended oxygen depletion event in the south-western Baltic Sea. In total, 56 Multinet-midi casts (5 depth-strata), 4 Multinet-maxi casts (9 depth-strata), as well as 17 bongo and 52 WP2 casts were performed from the surface to >3 m above the bottom. Data include depth resolved information on the abundance (m^-3 and m^-2) and size structure of (<i>i</i>) the non-indData in brief111511https://www.ebi.ac.uk/biostudies/studies/S-EPMC12017932biostudies-literatureJellyfish and comb jellies in the Baltic Sea: Depth resolved distribution pattern along the salinity gradient of the Baltic Sea during September 2020 - dataset.PMC12017932Hinrichsen HHHauss HJaspers CfalseJellyfish and comb jellies in the Baltic Sea: Depth resolved distribution pattern along the salinity gradient of the Baltic Sea during September 2020 - dataset.The biodiversity and distribution of gelatinous macrozooplankton was assessed in the Baltic Sea during September 2020. The dataset includes 40,601 species-specific gelatinous macrozooplankton records, representative of 236,329 gelatinous organisms caught across 73 stations in the south-western, central and northern Baltic Sea. Focus was devoted to changes in depth distributions in relation to salinity and an extended oxygen depletion event in the south-western Baltic Sea. In total, 56 Multinet-midi casts (5 depth-strata), 4 Multinet-maxi casts (9 depth-strata), as well as 17 bongo and 52 WP2 casts were performed from the surface to >3 m above the bottom. Data include depth resolved information on the abundance (m^-3 and m^-2) and size structure of (<i>i</i>) the non-ind2025-01-01T00:00:00Z2025 Jun2026-04-08T15:49:55.895Z2026-04-08T05:29:09.418ZS-EPMC120179324027084010.1016/j.dib.2025.111511