dɪtˈɜːmɪnɪŋ lˈɔŋfɪn sˈɛks ɪz dˈɪfɪkəlt æz ðɛɹ sˈɛkʃuːəl ˈɔːɹɡənz ɑːɹ nˌɑːt dɪtˈɜːmɪnd ʌntˈɪl ðeɪ ɑːɹ ˌoʊvɚ fˈoːɹɾi fˈaɪv sˌiːˈɛm ɪn lˈɛŋθ.
Determining longfin sex is difficult as their sexual organs are not determined until they are over 45 cm in length.