Français : éponge d'eau douce (Spongilla lacustris) dans l'Authie (dans la Région Hauts-de-France). Remarque : Malgré plusieurs périodes de pluies dans les heures et jours ayant précédé cette photo l'eau est restée claire, les éponges contribuent à filtrer l'eau, mais pas en hiver pour certaines espèces comme spongilla lacustris. L'éponge verte est Spongilla lacustris
English: Fresh water Sponge in Authie river (in the Region Hauts-de-France, Northern France). Note: Despite several rainy periods in the hours and days before this photo the water remained clear, the sponges help to filter the water, but not in winter for some species like spongilla lacustris.
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