1,2,3,4,6,7,8-HeptaCDF
formula: ; CAS Registry Number: 67562-39-4
Specimen
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  Bioindicator in rivers and lakes
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  As the only viviparous fish in German nearshore waters, it is a bioindicator in nearshore coastal marine ecosystems.
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  Inshore, the herring gull mainly feeds from the sea: upon fish, mussels, and crabs.
Sampling area
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  Important, old-industrialised conurbation in Germany.
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  Main water divide between the North- and Baltic Sea
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  Longest river in Germany
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  National Park in the largest brackish water (Bodden) habitat of the world.
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  National park in the world largest connected sand and mud flats.
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  Fourth largest river basin in Central Europe
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  Region in the chemical triangle of Central Germany
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  Second largest river in Europe
Sampling period
2019 - 2023