The fish auction at Numazu market is open to travellers from 5AM to 7AM almost everyday. You can watch the auction from the deck on the second floor in the fish market. There are many fish markets around the coast of Japan but Numazu fish market is one of the suitable place for travellers to watch fish auction. This fish market is designed to allow travellers to do sightseeing around. Numazu fish market is famous for fresh young sardine (shirasu) and tiny shrimp (sakura ebi shrimps).
The website of Numazu fish market is:
Sorry, I don’t find English written pages.
AloJapan.com