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Institut für Fischereiökologie

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27572 Bremerhaven
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DAIMON fish sampling in the Bornholm CWA dumpsite finalized


20,000 fish examined from dumping sites and reference areas.

Blood sampling for biomarker analysis in cod from the Bornholm CWA dumpsite (© Thünen-Institut)

RV Walther Herwig III sailing towards DAIMON sampling sites in the Baltic Sea (© Thünen-Institut)

The scientific crew of cruise 419 RV Walther Herwig III, 21st Aug.-9th Sept. 2018 after successful DAIMON studies and sampling in the Baltic Sea (© Thünen-Institut)

In the framework of the DAIMON project, the Thünen Institute of Fisheries Ecology undertook four cruises onboard RV Walther Herwig III for studying health effects of dumped CWA on the Baltic cod (Gadus morhua) and for taking fish samples for chemical contaminant analysis and for biological effect studies carried out by project partners. The most recent and final cruise under DAIMON took place from 21st Aug. to 9th Sept. 2018 and focused on the major Baltic Sea CWA dumpsite east of the island of Bornholm and CWA-free reference areas in the western and eastern Baltic Sea.

Altogether, more than 20,000 cod were examined for diseases and for changes in fitness indices within DAIMON and its forerunner projects CHEMSEA and MODUM, all addressing ecological risks associated with dumped CWA in the Baltic Sea. Data generated have been incorporated into the DAIMON fish database which forms one of DAIMON’s major backbones for Risk Assessment and the Decision Support System.

Although not all biological and chemical data obtained have been analyzed so far, the good news is that our preliminary results do not indicate that cod from the Bornholm CWA dumpsite in general show a worse health status compared to fish from reference areas without dumped munitions. However, more conclusive results will be available once all data are analyzed and once an integrated risk assessment combining chemical and biological data is performed.

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Contact Dr. Thomas Lang