Henkyou no Roukishi - Bard Loen - Vol. 5 Ch. 26 - The Sage's Cooking

[MangaDex]

 

[TehSDragon]

Thought it'd be eel, but it seems to be much smaller. Looks like a weird mix between eel and catfish, with some elements of pufferfish

 

[Szaal]

Nooo, I don't get to see the funni wasabi fish moonlight dish