Duiken 2017 : 20170810 : 20170810-RX160-Perca-fluviatilis-Baars-vis-plasKatwijk

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20170810-RX162-Dreissena-rostriformis-bugensis-Quaggamossel-weekdier-plasKatwijk



20170810-RX156-school-kleine-vis-plasKatwijk

20170810-RX162-Dreissena-rostriformis-bugensis-Quaggamossel-weekdier-plasKatwijk