European Directory of Marine Environmental Data (EDMED)

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Data set name

Vertical distribution of medusae in the Bornholm Basin, Baltic Sea data set (1993-95)

Data holding centreNational Marine Fisheries Research Institute (NMFRI)
CountryPoland  Poland
Time periodFrom 1993 to 1995
Geographical area

Bornholm Basin in the Baltic Sea; 3 transects during the cruise in July and August 1993 (55° 15.5'N, 15° 24.0'E - 55° 19.0'N, 15° 20.4'E; 55° 17.7'N, 15° 59.8'E - 55° 21.7'N, 16° 00.4'E; 55° 12.2'N, 15° 51.1'E - 55° 13.7'N, 15° 57.5'E); 1 transect in August 1994 (55° 13.9'N, 15° 58.6'E - 55° 17.8'N, 15° 52.7'E); 1 transect in September 1994 (55° 14.0'N, 15° 59.1'E - 55° 17.8'N, 15° 53.5'E); 1 transect in June 1995 (55° 14.1'N, 16° 07.6'E - 55° 20.0'N, 15° 57.7'E).


Bathymetry and Elevation; Salinity of the water column; Density of the water column; Temperature of the water column


The main aim of this project was to describe the vertical distribution of two species of scyphomedusae (Aurelia aurita and Cyanea capillata) and their co-occurrence with cod eggs in the Bornholm Basin. Samples were collected during the cruises on RV 'Baltica' in 1993, 1994 and 1995. During the 1993 cruise (22 Jul-07 Aug) three transects were chosen, and during the other cruises (17-28 Aug 1994; 01-09 Sep 1994 and 20-29 Jun 1995) one transect for each cruise was covered. Along these transects, stratified hauls with a Multinet were taken at a depth range from 0 to 80m (20-minute hauls, repeated five times in each 10-metre depth layer). The Multinet consisted of 5 nets of 0.25 m**2 opening and 300 microm mesh size; the last net could not be closed. The hydrological parameters were recorded with a CTD probe coupled with the sampler. During the 1993 cruise, when medusae constituted only a small part of the zooplankton sample, the whole sample was preserved in 4% borax-buffered formaldehyde. In this case, the measurements were carried out in the laboratory. Otherwise, medusae were counted (each species separately), measured (their total volume was registered) and then discarded. In 1994 and 1995, all captured medusae were counted and their diameters and volumes were measured. The alimentary canals of medusae were examined to determine the presence of cod eggs.

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 National Research Institute, Maritime Branch in Gdynia (IMWM MB)
Local identifier21005009
Global identifier1644
Last revised2009-01-15