is one piece episode 31 filler?

While at sea, Yosaku reveals Nami's destination: Arlong Park, the base of the most notorious pirate in the East Blue, Arlong. Yosaku suspects Nami is after Arlong's bounty and warns of the dangers that lie ahead since Arlong is a fish-man originating from the Grand Line, so his strength surpasses even that of Krieg.

Arlong had previously worked with Jinbe of the Seven Warlords of the Sea, seven government-sanctioned pirates, such as Mihawk. Yosaku, Luffy, and Sanji go to the galley for lunch.

Nami arrives at Arlong Park, where Arlong is bribing a corrupt Marine officer.