さかさなまずじゃなかったです
逆さ鯰じゃなかったです
sakasanamazujanakattadesu

Noun
Desu Copula

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

1. Wasn't a reversed catfish.; Wasn't an upside-down catfish.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana