53 CERATOPHYLLUM DEMERSUM  1-6
   53 LEMNA MINOR L.          1-6
   37 SPIRODELA POLYRRHIZA (L 1-6
   33 LEMNA MINOR L.          3-6
   30 LEMNA TRISULCA L.       1-6
   26 LEMNA GIBBA L.          1-6

   25 CERATOPHYLLUM DEMERSUM  4-6
   18 SPIRODELA POLYRRHIZA (L 3-6
   14 AZOLLA FILICULOIDES LAM 1-6
   10 LEMNA GIBBA L.          4-6
    9 HELODEA CANADENSIS RICH 1-6
    6 LEMNA TRISULCA L.       4-6

    6 AZOLLA FILICULOIDES LAM 3-6
    4 POTAMOGETON PUSILLUS L. 1-6
    3 CALLITRICHE OBTUSANGULA 1-6
    2 NUPHAR LUTEUM SM.       1-6
    2 NAIAS MAJOR ALL.        1-6
    2 POTAMOGETON TRICHOIDES  1-6

    1 UTRICULARIA VULGARIS L. 1-6
    1 RANUNCULUS CIRCINATUS S 1-6
    1 SAGITTARIA SAGITTIFOLIA 1-6
    1 HYDROCHARIS MORSUS-RANA 1-6
    1 WOLFFIA ARRHIZA (L.) WI 1-6
    1 POTAMOGETON CRISPUS L.  1-6