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EveryFish
Scomberomorus niphonius , Japan

Japanese Spanish mackerel

A large mackerel species found in East Asian waters.

Photo: re_nebel, CC BY 4.0, via Wikimedia Commons

The Japanese Spanish mackerel is a scombrid fish native to East Asia. It supports significant fisheries in South Korea, Japan and Taiwan. The species reaches one metre in length and is valued for sushi and grilled dishes.

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  • Reaches a maximum length of 100 cm
  • Key fishery species in South Korea and Japan
  • Served as sushi in Japan under the name sawara
  • Often grilled in Korea as samchi-gui

What it is

This fish belongs to the true mackerel group within the Scombridae family. It grows up to one metre long and can weigh over ten kilograms. The body shape is typical of fast swimming pelagic species. It is known as the Japanese seer fish in some regions. The scientific name is Scomberomorus niphonius.

Where it lives

The species inhabits waters in East Asia. It is found in the coastal zones of South Korea, Japan and Taiwan. These areas support the main populations targeted by local fishing fleets. The specific depth range and temperature preferences are not detailed in the available records.

How it lives

Information regarding daily behaviour, diet and predator interactions is limited in the provided text. As a member of the mackerel family, it likely exhibits active swimming habits. It forms part of the marine ecosystem in East Asian coastal waters.

Breeding and life cycle

The reproductive cycle and specific breeding grounds remain unspecified in this overview. Further biological study would be required to outline its life history traits.

Japanese Spanish mackerel
A drawing made by EveryFish from what this page says. It is a diagram, not a picture of the real fish.

Fish and people

Fisheries in South Korea report the highest annual catches, followed by Japan and Taiwan. Total recorded catches reached roughly 56,000 tonnes in 2009. China reports large volumes of unidentified seer fish, which likely include this species. In Korea, it is grilled as samchi-gui. In Japan, it is served as sushi under the name sawara.

Status and threats

Conservation status is not explicitly stated in the provided information. The large unreported catches from China may impact stock assessments.

Scomberomorus nichonius (Cuvier)
Scomberomorus nichonius (Cuvier). Photo: (Cuvier), Public domain, via Wikimedia Commons
Scomberomorus niphonius , Japan
Scomberomorus niphonius , Japan. Photo: re_nebel, CC BY 4.0, via Wikimedia Commons
Ареал мелкопятнистой королевской макрели
Ареал мелкопятнистой королевской макрели. Photo: Melissanda, CC BY-SA 4.0, via Wikimedia Commons
Japanese Spanish Mackerel ( Scomberomorus niphonius ) in China
Japanese Spanish Mackerel ( Scomberomorus niphonius ) in China. Photo: Wensen Wang, CC BY-SA 4.0, via Wikimedia Commons

Questions people ask about Japanese Spanish mackerel

What is the Japanese name for this fish?

In Japan, the fish is called sawara. It is commonly served as sushi. This name distinguishes it from other mackerel species in local cuisine and markets.

Which country catches the most Japanese Spanish mackerel?

South Korea reports the largest annual catches of this specific species. Japan and Taiwan follow in volume. China catches large amounts of seer fish but does not specify this species separately.

How large does this mackerel grow?

The maximum reported length is 100 cm. The heaviest recorded weight is 10.57 kg. These dimensions make it a substantial catch for commercial and recreational fishers in East Asia.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Japanese Spanish mackerel", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

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The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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