The Young Man and the Sea

is episode 223 of the Naruto: Shippūden anime.

Summary
Tsunade sends out Naruto under the guise of a top-secret mission to the Land of Lightning to keep him hidden away from the Akatsuki. Naruto leaves Konoha with Aoba, Yamato, Guy along with three other unknown shinobi. They are however, held up at the port due to a report of a monster attacking ships making people afraid to set sail. When Guy and Aoba go out to see if they can solve the problem, they encounter an aggressive giant marlin and a fisherman named Yūsuke who lost his father to the marlin and wanted to avenge him. On the next day, the ninjas give Yūsuke a boat and a fishing pole and Guy rowing the boat. After much struggle, Yūsuke finally catches the marlin with his own strength. After that Naruto and the others are finally able to set sail for the Land of Lightning.

Trivia

 * The episode's name and story are probably based off Ernest Hemingway's novel, The Old Man and the Sea.
 * A poster for the Naruto Shippūden 5: Blood Prison was shown on a wall at the beginning of the episode.