Lake Hamana Eel Farming — Tour Japan's Eel Aquaculture

Lake Hamana (浜名湖) is Japan's eel farming center, producing 40% of the nation's farmed unagi (freshwater eel) using traditional methods passed through generations. The lake's brackish water (mix of saltwater from Enshu Bay and freshwater from rivers) creates ideal conditions for eel growth — the salinity stress produces firmer flesh than pure freshwater eel. Several eel farms offer tours showing cultivation process: glass eel (稚魚, infant eels 5cm long) are raised in temperature-controlled ponds for 18–24 months until reaching market size (40–50cm).

The tours explain eel aquaculture challenges: glass eel supply is declining globally (overfishing of wild juveniles), farming requires precise water temperature/quality control, and eels are prone to disease. Lake Hamana farmers use lower density stocking (fewer eels per pond) than industrial farms, producing premium-quality eel with better flavor and texture. The tours conclude with eel tasting — grilled kabayaki prepared from farm-raised eel.