Hydrography sensors

An important part of marine research is the recording of the physical parameters of the water column. So-called hydrography sensors (CTD sensors) are used for this purpose. These sensors are usually used to measure vertical profiles of at least temperature and salinity (actually: conductivity) (CTD = conductivity, temperature, depth). Depending on the task and configuration of the sensor, however, other parameters such as oxygen, turbidity and chlorophyll-a can also be measured as indicators of primary production.

The hydrography sensors of the Thünen Fisheries Institutes are largely maintained and prepared for use by the Institute of Sea Fisheries. However, the maintenance of the hydrographic probes used on the fisheries research vessel "Clupea" is carried out by the Thünen Institute of Baltic Sea Fisheries because this vessel is used almost exclusively in the Baltic Sea.