Willem Kolvoort Onderwaterfotografie
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Freshwater
Underwater Landscapes
Aquatic plants
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Fishes
Underwater Insects
Cnidaria
Gill snails
Lung Snails
Protozoa
Moss animals
Bivalves
Rotifers
Shellfish
Arachnids
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Worms
Beeldschoonwater, streams in Drenthe
Naardermeer
My pond
From the past
Split level pictures
Saltwater
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Underwater Insects
Great silver diving beetle ( Hydrous piceus )
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