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Nissui subsidiary reports first harvest from RAS facility

January 3, 2022  By  Nestor Arellano

(Imgae: Nissui)

A subsidiary of Tokyo-based marine product company Nippon Suisan Kaisha Ltd., also known as Nissui, reported this week its very first harvest of sashimi-grade, chub mackerel from a recirculating aquaculture system (RAS) facility in Sakaiminato City, Japan.

The facility run by Yumigahama Fisheries Co., was stocked with hatchery seedlings in June 2020. The Nussui subsidiary said the first harvest was made on Nov. 25, 2021. The mackerel weighed between 250 and 350 grams. The fist were sold to retailers and wholesalers, according to a report from the SeafoodSource.com.

Chub mackerel, is called masaba in Japan. The specie is considered one of the best fish for sashimi.


Yumigahama is primarily involved in developing a silver salmon (coho) cultivation business named “Kado Sado Salmon.” The company is raising about 700,000 silver salmon on 14 fish cages at a farm in Miho Bay .

Yumigahama also raises yellowtail kingfish, also known as hiramasa, and Pacific bluefin tuna.

The RAS facility in Sakaiminato City is part of a joint venture with Japanese engineering firm Hitachi Zosen. Hitachi provided the water treatment equipment for the land-based facility. The RAS facility uses underground water.

RAS mackerel project is a joint venture between Yumigahama and Osaka-based industrial engineering firm Hitachi Zosen, which provided the water-treatment technology for the farm, utilizing underground seawater.

The fish come from hatchery seedlings stocked to the RAS facility in June of 2020. The first fish harvested on Nov. 25, 2021 weighed between 250 and 350 grams and were sold to retailers and fishery wholesalers. In the future, the companies said they are aiming to shorten growth-time and increase density to improve profitability. The first commercial-scale harvest is planned for April of 2023.


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