is one piece episode 558 filler?

The Noah approaches Fish-Man Island and Neptune is shocked by this and Fukaboshi tries to ask why he's so worried claiming the ship to be an old relic of history. However, Neptune says that's not true and that ship is not meant to move till the "Promised Day" comes.

At the plaza, the New Fish-Man Pirates are amazed at Hody Jones' new found strength and endurance and that Luffy was able to hurt him. Luffy comments that Hody is built like a tank.

Hody asks Luffy if he knows what Fish-Man Karate is as he thrusts his palm forward.