おうにしようくろまぐろだったら
大西洋黒鮪だったら
ōni shiyō kuromagurodattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of たいせいようくろまぐろ

1. If it were bluefin tuna; If it was bluefin tuna

Tara Conditional
Usually Written in Kana