oːɹˈiə ɑːɹ ɐn ɪmpˈoːɹtənt tɹɐdˈɪʃənəl fˈuːd sˈoːɹs fɔːɹ mˈaʊɹi, hˌuː hæv lˈɔŋ hæd ɛkstˈɛnsɪv nˈɑːlɪdʒ ʌvðə tˈaɪmɪŋ ʌv ðɛɹ ʌpstɹˈiːm ænd dˈaʊnstɹiːm maɪɡɹˈeɪʃənz.
Ōrea are an important traditional food source for Māori, who have long had extensive knowledge of the timing of their upstream and downstream migrations.