ɪts pˌɑːpjʊlˈeɪʃən hɐz dɹˈɑːpt sɪɡnˈɪfɪkəntli, mˈeɪnli dˈuː tə ðə dᵻɡɹɐdˈeɪʃən ʌv mˈeɪn hˈæbɪtˌæts, spˈɔːnɪŋ ɡɹˈaʊndz ænd fˈɔːɹɪdʒɪŋ ɡɹˈaʊndz.
Its population has dropped significantly, mainly due to the degradation of main habitats, spawning grounds and foraging grounds.