せいぎょじゃありませんでした
斉魚じゃありませんでした
seigyojārimasendeshita

Noun
Desu Copula

The polite, past negative form of えつ

1. Was not a carp.; Was not a crucian carp.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana