Seaweeds grow mostly in shallow marine waters, under  deep; however, some such as Navicula pennata have been recorded to a depth of .
sˈiːwiːdz ɡɹˈoʊ mˈoʊstli ɪn ʃˈæloʊ mɚɹˈiːn wˈɔːɾɚz, ˌʌndɚ dˈiːp; haʊˈɛvɚ, sˌʌm sˈʌtʃ ɐz nævˈɪkjʊlə pɛnˈɑːɾə hɐvbɪn ɹᵻkˈoːɹdᵻd tʊ ɐ dˈɛpθ ʌv .