is one piece episode 784 filler?

After days without food, a famished Luffy finally manages to catch something while fishing, and he excitedly brings it up. Though he initially succeeds, the giant fish falls back into the water, where it resists Luffy's attempts to pull it onto the Thousand Sunny.

The Sanji Retrieval Team, in a massive effort, manages to pull the fish onto the Sunny, where they prepare to cook and eat it. Chopper notes that its color seems strange, and decides to look for information on it in Sanji's locker.