The aquarium's name, 'Uotto', is a play on the Japanese word 'uo' (fish) and the English 'otto' (a sound of surprise or a nickname suffix).
The facility uses real water pumped directly from Lake Hamana to maintain natural conditions for the exhibits.
It features a unique 'stepping stone' pond that allows children to interact with local fish species safely.
The aquarium provides a detailed look at how the lake's salinity fluctuates depending on the tide and distance from the sea, influencing local biodiversity.
It is one of the few aquariums in Japan dedicated entirely to a single regional lake system rather than a general ocean collection.
Lake Hamana Aquarium Uotto is a specialized facility focused exclusively on the diverse aquatic life of the brackish Lake Hamana ecosystem. It features an integrated structure where visitors can observe local fish species in displays that mimic the lake's unique environment, ranging from freshwater rivers to the Pacific Ocean transition zone. A primary attraction is the large outdoor pool and the indoor 'Tachibi' observation area, which provides a cross-sectional view of the lake's water column. The aquarium emphasizes education regarding the local fishing industry and the conservation of species like the Japanese eel and black porgy. It is operated as part of the Enshu Railway Group and serves as a research and educational hub for Shizuoka's marine biology.
The large panoramic window in the main hall that offers a direct view of Lake Hamana framed by the aquarium's interior displays.
Visit during feeding times, often announced at the entrance, to see the more reclusive species emerge.
Check the daily tide schedule for Lake Hamana before visiting, as the water level and visibility in the outdoor exhibits fluctuate accordingly.
Spend time in the information room to learn about the specific fishing nets and traditional methods used by local Hamana fishermen.
Attempting to feed the fish with personal food items, which is strictly prohibited to maintain water quality.
Closed on certain days of the week, typically Wednesdays, unless it falls on a national holiday.
