どじょうじゃありませんでした
泥鰌じゃありませんでした
dojōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of どじょう

1. Was not a carp.; Was not that kind of fish.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana