The fishing boats leave before dawn. The catch depends on the season, the weather, and the skill of the crew. The market price depends on what everyone else caught. This is the arithmetic of fishing, and the short-term immersion programs in Tosa Shimizu offer the experience of living inside it for a few days. Tosa Shimizu sits near Cape Ashizuri at the southern tip of the Shikoku peninsula, facing the Pacific. The fish here — katsuo bonito, kinmedai splendid alfonsino, the particular variety of seafood that the Kuroshio Current brings to this coast — are exceptional. The fishermen who work these waters have knowledge specific to this ocean in this season that no amount of general fishing experience would provide. Joining the boats requires accepting the uncertainty of the work: the schedule is subject to weather and fish, and some days the program will not run. This is not a disappointment to be managed but a condition to be understood. The uncertainty is part of what makes fishing what it is. Experiencing it alongside people who have built their lives around it changes the relationship to every piece of fish you eat afterward.