Data presented here were collected during the cruise UT2020-01 (Project HAB DK/Limfjord, 'Harmful Algae Blooms in Danisch waters') with the RV Uthörn from Bremerhaven to Bremerhaven (13.08. - 21.08. 2020 and 21.09. - 27.09.2020) , with station work in the German Bight and the Limfjord. In total, 34 vertical CTD-hauls were conducted. The CTD system used was a Sea-Bird Electronics Inc. SBE 19plus, attached to a SBE 55 Carousel Water Sampler containing 6 x 4-liter bottles. The system was equipped with: single temperature and conductivity probe (SBE 7245), a pressure sensor (Digiquartz), a fluoroscence sensor (Turner Scufa) and an oyxgen probe (Aanderaa optode, SN 1542). The sensors were pre-calibrated by the manufacturers. The data were recorded with the Seasave (V 7.26.7.107) software and processed using SeaBird SBE Data Processing software (V 7.26.7.1, DataConversion, Filter, LoopEdit, Bin Average) and visually checked. The ship position was derived from the shipboard GPS-system. The time zone is given in UTC.