41 LEMNA MINOR L.          1-6
   36 LEMNA TRISULCA L.       1-6
   34 LEMNA MINOR L.          3-6
   26 SPIRODELA POLYRRHIZA (L 1-6
   17 LEMNA TRISULCA L.       3-6
   14 CERATOPHYLLUM DEMERSUM  1-6

   14 LEMNA TRISULCA L.       4-6
   14 SPIRODELA POLYRRHIZA (L 3-6
   14 SALVINIA NATANS (L.) AL 1-6
    9 HYDROCHARIS MORSUS-RANA 1-6
    4 LEMNA GIBBA L.          1-6
    4 POTAMOGETON PUSILLUS L. 1-6

    3 HELODEA CANADENSIS RICH 1-6
    2 CERATOPHYLLUM DEMERSUM  5-6
    2 UTRICULARIA VULGARIS L. 1-6
    2 HYDROCHARIS MORSUS-RANA 4-6
    1 MYRIOPHYLLUM SPICATUM L 1-6
    1 HIPPURIS VULGARIS L.    1-6

    1 UTRICULARIA MAJOR SCHMI 1-6
    1 POTAMOGETON PECTINATUS  1-6
    1 AZOLLA FILICULOIDES LAM 1-6
    1 SALVINIA NATANS (L.) AL 5-6