algae;  waterweed;  seaweed;  duckweed
 to struggle;  to writhe;  to wriggle;  to act frantically;  to make desperate efforts
 scraps of seaweed;  death at sea (metaphor)
 to struggle;  to writhe;  to wriggle;  to act frantically;  to make desperate efforts
 marimo (variety of algae, Cladophora aegagropila);  round green algae;  Cladophora ball;  lake ball;  moss ball
 seaweed salt;  salt from burning seaweed
 water plant;  seaweed;  algae
 florid expression;  poetical talent
 hydrilla (species of aquatic plant, Hydrilla verticillata);  Papenfussiella kuromo (species of brown algae)
 green algae;  chlorophyceae
 diatomaceous earth;  diatomite;  siliceous marl;  kieselguhr
 florid expression;  poetical talent
 seaweed bed;  seaweed forest
 blue-green algae;  cyanobacteria
 shed skin (of a snake, insect, etc.);  ecdysis
 cyanophyte;  cyanobacteria;  blue-green algae
 Sargassum fulvellum (species of edible brown alga)
 watermelon snow;  snow algae
 Eurasian water milfoil (Myriophyllum spicatum);  aquatic plants such as hornwort that are commonly used in goldfish tanks, etc.
 completely empty (of a residence, etc.);  vacant;  body from which the soul has left;  corpse;  shed skin (of a snake, insect, etc.)
 Sargassum fulvellum (species of edible brown alga)
 Sargassum fulvellum (species of edible brown alga)
 seaweed used in making salt;  anthology
 brown algae;  phaeophyceae
 Japanese mitten crab (Eriocheir japonica)
 wakame (species of edible brown seaweed, Undaria pinnatifida)
 mozuku (Cladosiphon okamuranus and Sphaerotrichia divaricata, types of edible seaweed)
 common hornwort (Ceratophyllum demersum);  Analipus japonicus (species of brown alga)
 Phyllospadix iwatensis (species of seagrass)
 eelgrass (Zostera marina)
 diatomaceous earth;  diatomite;  siliceous marl;  kieselguhr
 whorl-leaf water milfoil (Myriophyllum verticillatum)
 Closterium (genus of algae)
 Brazilian elodea (species of aquatic plant, Egeria densa)
 waterwheel plant (Aldrovanda vesiculosa)
 Notonecta triguttata (species of backswimmer)
 waterweed (any aquatic plant of genus Elodea, esp. common waterweed, Elodea canadensis)
 Chlorophyta;  division of green algae
 Glaucophyceae (class of glaucophytes)
 washed-up seaweed;  stranded seaweed
 washed-up seaweed;  stranded seaweed
 Zygnematophyceae (class of green algae)
 Eurasian water milfoil (Myriophyllum spicatum)
 basket star (any brittlestar of family Euryalina);  basket fish
 Ochromonas vischeri (species of golden alga)
 floating watermoss (Salvinia natans)
 dinoflagellate of genus Ceratium
 stonewort (esp. Braun's stonewort, Chara braunii)
 dwarf eelgrass (Nanozostera japonica);  Japanese eelgrass
 Chaetomorpha algae;  Chaeto;  nostoc
 Oscillatoria (cyanobacteria)
 star duckweed (Lemna trisulcata);  ivy duckweed
 small pondweed (Potamogeton pusillus)
 spiny lebbeid (Lebbeus groenlandicus)
 spiny water nymph (Najas marina);  spiny naiad;  holly-leaved naiad
 devil weed (Sargassum horneri)