European Directory of Marine Environmental Data (EDMED)

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Data set name

Mesozooplankton in Gdansk Basin, southern Baltic Sea data set (1987-88)

Data holding centreNational Marine Fisheries Research Institute (NMFRI)
CountryPoland  Poland
Time periodFrom 20 January 1987 to 15 January 1988
Geographical area

3 sites in the Gdansk Basin: station 92A (54° 26'N, 18° 40'E), station R6 (54° 57.5'N, 18° 24'E), station G2 (54° 50'N, 19° 20'E). Station 92A was an inshore sheltered site; station R6 was located inshore; and station G2 was an offshore site close to the open sea


Zooplankton wet weight biomass; Zooplankton taxonomy-related abundance per unit volume of the water column


The main goal of this project was to obtain a full and complex picture of the whole biocenosis and physical environment in the researched area. The exact sampling dates are as follows: 20-21 Jan, 11-14 Feb, 27 Feb-01 Mar, 23-25 Mar, 30 Mar-02 Apr, 13-15 Apr, 27-30 Apr, 11-13 May, 26-28 May, 15 Jun, 29 Jun-02 Jul, 14-17 Jul, 05-08 Aug, 23-27 Aug, 08-11 Sep, 22-25 Sep, 14- 16 Oct, 26-29 Oct, 16-18 Nov, 03-05 Dec, 15-18 Dec 1987 and 12-15 Jan 1988. The mesozooplankton abundance was measured based on the vertical hauls with a WP-2 net of 100 microm mesh size at the following depth strata: 0-15m and 15m- bottom (stations 92A and R6); 0-15, 15-30, 30-60, 60-90 and 90m-bottom (station G2). In addition, water samples were drawn with a bathymeter from the following depth strata: 0-30m, every 5m; 30m-bottom, every 10m. Water samples were strained through a 60 microm mesh and pooled according to the following depth layers: 0-15, 15-30, 30-60, 60-90 and 90m-bottom. All zooplankton samples were preserved in a 4% formaldehyde-sea water solution buffered with borax, and identified under a binocular microscope. A Folsom splitter was used to obtain subsamples of the material. Not less than 500 individuals per sample were measured and their body volumes were estimated by approximating the actual body shape with a simplified geometric form. Taxonomic classification of organisms in samples was performed to the highest possible taxon level (usually, to the species level). Also, the developmental stages of copepodites were identified. Fish eggs, copepod eggs and larval stages of benthic organisms were enumerated.

OriginatorsNational Marine Fisheries Research Institute (NMFRI)
OrganisationNational Marine Fisheries Research Institute (NMFRI)
ContactDr. Wlodzimierz Grygiel (national co-ordinator of IBSSP)

National Marine Fisheries Research Institute (NMFRI)
Kollataja 1


Telephone+48 58 6201728
Facsimile+48 58 73 56 110
Collating centreInstitute of Meteorology and Water Management, Maritime Branch in Gdynia (IMWM MB)
Local identifier21005010
Global identifier1645
Last revised2009-01-15