Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Walther Herwig III	WH469	10.08.2023 - 24.08.2023	INMON	Skagerrak North Sea Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Wysujack Klaus	Thunen-Institut fur Fischereiokologie	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

Within the framework of the monitoring programme of the Thunen Institute for Fisheries Ecology (FI) on the health status and contamination of fish in the North Sea and Baltic Sea with heavy metals and organic pollutants, investigations were carried out in six Baltic Sea and seven North Sea areas as well as one station in the Skagerrak. In addition to recording macroscopically visible external and internal diseases and parasites in dab (Limanda limanda) and cod (Gadus morhua) on board, samples were collected for subsequent studies on pollutant levels (organic, inorganic, radioactive substances) and biological pollutant effects. Further samples were taken to analyse the infestation of cod with two parasites (Loma morhua and Contracaecum osculatum) depending on the geographical location and water depth. Furthermore, in co-operation with the University of Hohenheim, tissue samples (liver, muscle, brain) of various fish species were taken in the Baltic and North Sea for subsequent analysis of the levels of halogenated natural products (HNPs). During the bottom trawl hauls, marine litter caught was routinely recorded. A neuston catamaran (Hydro-Bios) was regularly used for the additional collection of litter floating on the water surface. In addition, accompanying hydrographic investigations (water temperature, salinity, oxygen content) were carried out.

Messungen / Measurements