ðɪ ˈɛlnˈʌmbɚ sˈɪstəm ɪz ɐ sˈɛmaɪsaɪəntˈɪfɪk klˌæsɪfɪkˈeɪʃən sˈɪstəm ʌv kˈætfɪʃ bˈeɪst ˌɔn fˈoʊɾəɡɹˌæfz ʌv ʃˈɪpmənts ʌv tɹˈɑːpɪkəl kˈætfɪʃ ʌvðə fˈæmɪli lˈoːɹɪkˌæɹɪˌɪdiː pˈʌblɪʃt baɪ ðə dʒˈɜːmən ɐkwˈɛɹiəm mˌæɡɐzˈiːn dˈæts dˈaɪ ɐkwˈɑːɹɹiən ˈʌnd tˈɛɹɑːɹɹˌiənzaɪtʃɹˌɪft ðɪ ɐkwˈɛɹiəm ænd tɛɹˈɛɹiəm mˌæɡɐzˈiːn.
The L-number system is a semi-scientific classification system of catfish based on photographs of shipments of tropical catfish of the family Loricariidae published by the German aquarium magazine DATZ (Die Aquarien- und Terrarienzeitschrift (The Aquarium and Terrarium Magazine)).