Well, without more context, it's difficult to say precisely. But if we assume it's a story within ArcheAge, it could be about the old man's experience. He might have gone on a long fishing journey, encountered various obstacles, and finally caught the big fish. This story could also be a symbol of perseverance in the game's context. It might be shared among the players or NPCs in the game to inspire others or just as a form of entertainment. The big fish could also be a metaphor for something bigger in the game, like a big achievement or a rare discovery.
Perhaps it's a unique narrative within the ArcheAge universe. The 'old man's big fish story' could be a way to pass on lore or just a fun anecdote. It could involve elements like the old man's relationship with the sea in ArcheAge, the type of fish he claims to have caught which might be a rare or mythical one in the game, and how this story impacts the other characters or the overall atmosphere of the game world.
I'm not entirely sure as it could be many things. It might be a story in the game ArcheAge where an old man tells a tall tale about a big fish. Maybe it's about his fishing adventures, the challenges he faced while trying to catch this huge fish, or it could be a fictional story he made up to entertain others in the game world.