ヨーロッパおうなまずであれば
ヨーロッパ大鯰であれば
yōroppaōna mazudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of ヨーロッパおおなまず

1. If Europe's giant catfish…; If there were a giant catfish of Europe…

Ba Conditional
Usually Written in Kana