fish
inverts
plants
   a
     Acorus
     Aeschynomene
     Aldrovanda
     Alisma
     Althenia
     Alternanthera
     Ammannia
     Anemopsis
     Angiopteris
     Anubias
     Aponogeton
     Aridarum
     Asplenium
     Azolla
     algae
       black
       green
         Aegagropila
         Chara
       nutrients
       sucession
   b
   c
   d
   e
   f
   g
   h
   i
   j
   l
   m
   n
   o
   p
   r
   s
   t
   u
   v
   w
   x
   z
misc