さかさなまずでわありませんでした
逆さ鯰ではありませんでした
sakasanamazudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of さかさなまず

1. Was not a reversed catfish.; Was not an upside-down catfish.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana