Katsuura Tuna Market — Honmaguro Auction & Sashimi

Katsuura Fishing Port (勝浦漁港) in Nachikatsuura Town is one of Japan's premier tuna landing ports, especially famous for honmaguro (本鮪, bluefin tuna) and mebachimaguro (目鉢鮪, bigeye tuna) caught in the Pacific Ocean. The port's tuna auction (visible to tourists from an observation deck) begins at 7:00am daily, where massive tuna (some exceeding 200kg) are laid out on the floor for buyers to inspect before rapid-fire bidding determines prices. The auction is smaller and more accessible than Tokyo's Toyosu Market, allowing visitors to observe tuna grading (inspecting fat content, color, and texture) up close.

The adjacent Nigiwai Market (にぎわい市場) opens at 8:30am, offering ultra-fresh tuna sashimi, donburi (rice bowls), and grilled tuna at prices significantly lower than Tokyo. The maguro donburi (マグロ丼) — thick slices of bluefin tuna sashimi over rice — showcases the fish's quality: deep red color, marbled fat (toro), and buttery texture. Katsuura's fishing fleet targets tuna year-round, but autumn-winter (October-February) is peak season when fattier fish return from northern waters. The port also processes skipjack tuna (katsuo) for katsuobushi (dried bonito flakes), a fundamental ingredient in Japanese dashi stock. The combination of working port atmosphere, fresh tuna, and coastal setting makes Katsuura a seafood lover's pilgrimage.