Luffy will never learn it. When he sees food (here it were ducks), he'll even jump into the water, even if he can't swim at all.
Zoro tries to stop him. And Sanji holds Zoro too, so Luffy can't jump into the water.
It was really fun. You know, we made photos there with some photographers and I saw the ducks swimming on the water and ran to catch them. The boys automatically ran after me (Luffy) and grabbed me at my vest.
as Monkey D. Luffy
as Roronoa Zoro
(Sabaody Archipelago)Serie - One Piece