おにじゃなかったです
鬼鰧じゃなかったです
oni janakattadesu

Noun
Desu Copula

The polite, past negative form of おにおこぜ

1. Wasn't a ghost carp.; Wasn't a demon carp.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana