Tsurizao Hitotsu de Isekai Hourou

Owari Machida was a professional fisherman who made a name for himself in the media, but his former glory proved short-lived, and he struggles everyday to make ends meet. One day, while out boat fishing, he gets swept away by the waves and fell into the sea, losing consciousness as he downs because of a malfunction of his life jacket. When Owari awakens, the scenery has completely changed—he finds himself in an Isekai... In this world where the culture of fishing has declined, Owari wanders around enjoying fishing with the fishing gear that transmigrated with him, while interacting with the locals...

(Source: Shinchosha, translated)