ɪt hˈæzbiːn ˈɑːɹɡjuːd təbi ɐ dɪstˈɪŋkt spˈiːsiːz, bˌiːɪŋ ɹᵻpɹədˈʌktɪvli ˈaɪsəlˌeɪɾᵻd fɹʌm "nˈoːɹməl" bɹˈaʊn tɹˈaʊt sˈælmoʊ tɹˈʌɾə ʌvðə sˈeɪm lˈeɪks, pɚtˈɪkjʊlɚli ɪn ˈaɪɚlənd.
It has been argued to be a distinct species, being reproductively isolated from "normal" brown trout (Salmo trutta) of the same lakes, particularly in Ireland.