Namamugi Marine Fish Center is a specialist aquarium retailer operated by Namamugi Marine Fish Center Co., Ltd., based in Tsurumi, Yokohama, Japan. The business focuses on marine fish and aquarium keeping, offering fish, corals, and equipment through its store and online shop, which accepts orders around the clock. Customers can follow frequent stock updates and live broadcasts on YouTube to see new arrivals.

The center also designs and installs aquariums, including custom-made and overflow systems, and provides on-site setup and support. It reports selling more than 180 overflow aquariums annually, with services that include free online estimates and urgent visits. Its aquarium information and customer examples help owners plan installations and care for their systems.

For freshwater enthusiasts, the center specializes in ranchu, a variety of ornamental goldfish, sourced directly from breeders. Its website also features product and care information, news, staff introductions, store details, and customer updates. The shop welcomes inquiries from customers in Japan and abroad and offers loyalty points and updates on promotions and other news.