http://gp.sea.gov.ua:8082/ipt/resource?r=ukrmonitoring2004 UA_2004_mesozooplankton Mykhailo NABOKIN Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES) Oleksandr Leposhkin Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES) Oleksandr Neprokin o.neprokin@gmail.com user 2026-08-07 eng Data were collected during the Ukrainian national monitoring program in 2004. Mesozooplankton samples were collected using a vertical plankton Juday net with a 0.1 m² mouth opening area and 150 μm mesh size, from 2 meters above the bottom or from the lower boundary of the oxic layer to the surface at discrete sampling layers. The length and angle of the wire were taken into consideration for calculation of the wire length to reach the target horizon. The samples were preserved in 4% formaldehyde buffered to pH 8–8.2 with disodium tetraborate (borax) (Na₂B₄O₇·10H₂O) formalin solution (1 part 40% formaldehyde solution and 9 parts water/sample) and stored in plastic containers. In the laboratory, the samples were concentrated to 100–150 cm³ before being divided into sub-samples. A Bogorov's chamber was used for quantitative assessment (abundance and biomass calculation using species individual weight) and qualitative (taxonomic structure) processing of sub-samples. The sub-samples were examined using a Stereoscopic Zoom Microscope. At least 100 organisms from each of the three dominant species were counted in each sub-sample. The precision of the calculated abundance for organisms of the first three groups, counted up to 100 specimens, amounts to 20% (Alexandrov et al., 2014). Species were identified according to Morduhay-Boltovskoy (1968, 1969 and 1972). Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction. Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://blackseadb.org/ North-western part of the Black Sea 30.081 32.168 46.755 46.012 asNeeded Olena Miasnikova Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES) Oleksandr Leposhkin metadataProvider 2026-06-25T00:41:36.752+03:00 dataset Ukrainian Scientific Centre of Ecology of the Sea (UkrSCES) http://gp.sea.gov.ua:8082/ipt/resource?id=ukrmonitoring2004/v1.2.xml