Crossword Genius

Small aquatic organisms (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Tiny creatures" , "Water micro-organisms" , "Small organisms that float in water in great numbers" , "Drifting aquatic organisms" , "Forms of microscopic life that float in sea" .)

I've seen this clue in The Independent.
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