Crossword Genius

Collection of organisms inhabiting the surface layer of a sea or lake (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Tiny floating organisms" , "Whale's staple diet" , "Marine organism" , "sea creatures" , "Small organisms that float in water in great numbers" .)

I've seen this clue in The Mirror.
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