あぶらそこもつでわありませんでした
脂底鯥ではありませんでした
aburasokomotsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of あぶらそこむつ

1. Was not a fatty flounder.; Was not a type of flounder with fatty flesh.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana