Willem Kolvoort Onderwaterfotografie
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Freshwater
Underwater Landscapes
Aquatic plants
Amphibians
Fishes
Underwater Insects
Cnidaria
Gill snails
Lung Snails
Protozoa
Moss animals
Bivalves
Rotifers
Shellfish
Arachnids
Sponges
Worms
Beeldschoonwater, streams in Drenthe
Naardermeer
My pond
From the past
Split level pictures
Saltwater
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Underwater Insects
Backswimmer ( Notonecta glauca )
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