These crustaceans adhere to ships' hulls
They attach themselves to hard surfaces with "cement" produced by glandsin the 
... Attachment to the hull of a ship can increase a ship's fuel consumption by up to
... [DOC] [TLE] 'Marine crustacean, attaches to a boat-hull (8)' | Crossword Puzzle ... [PAR] 'Marine crustacean, attaches to a boat-hull (8)' crossword puzzle clue has 1 
possible answer and appears in 1 publication.