Crossword Genius

Source of caviar, found in the Black and Caspian seas (6)

Ross

I believe the answer is:

beluga

(Other definitions for beluga that I've seen before include "Species of sturgeon" , "Large caviare-yielding sturgeon" , "Large sturgeon or it's caviare" , "Small white whale; type of caviar" , "Could a bugle be a source of caviar?" .)

I've seen this clue in The Guardian.
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