ðə ɹᵻkɹˈuːtmənt ʌv ɡlˈæs ˈiːlz ˌɪntʊ nˈuː zˈiːləndz fɹˈɛʃwɔːɾɚ ɹˈɪvɚ nˈɛtwɜːks ɪz ɐ vˈɛɹi vˈɛɹɪəbəl pɹˈɑːsɛs, θˈɔːt təbi ɐfˈɛktᵻd baɪ ðɪ ˌɛl nˈiːnjoʊ ænd lˌæ nˈiːnjə sˈʌðɚn ˌɑːsɪlˈeɪʃənz.
The recruitment of glass eels into New Zealand's freshwater river networks is a very variable process, thought to be affected by the El Niño and La Niña Southern Oscillations.