Duiken 2018 : 20181102 : 20181102-S10010-jonge-Quaggamossels-op-Smalle-waterpest-plasKatwijk

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20181102-S10009-Elodea-nuttallii-Smalle-waterpest-plant-plasKatwijk

20181102-S10012-jonge-Quaggamossels-op-Smalle-waterpest-plasKatwijk

20181102-S10009-Elodea-nuttallii-Smalle-waterpest-plant-plasKatwijk

20181102-S10012-jonge-Quaggamossels-op-Smalle-waterpest-plasKatwijk