Saltwater · Summer to autumn in inner bays and estuaries

Japanese Sardinella

Sardinella zunasi

A small, deep-bodied herring of Japan's inner bays and a regular of the pier sabiki 'three silvers' ID set with the sardine and the gizzard shad. In Okayama it is the fish behind mamakari, the famous vinegared local dish. Look for the single dark shoulder spot and the deep body — the sardine, by contrast, carries a whole row of flank spots.

Seasons · Peak

Jan

Feb

Mar

Apr

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Jun

Jul

Aug

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Dec

Japanese Sardinella — Photo: Totti, CC BY-SA 4.0 — Wikimedia Commons

Identifying features

Deep, strongly compressed silvery body — deeper than the sardine
A single dark spot at the shoulder just behind the gill cover
No row of spots along the flank, unlike the Japanese sardine
Small, slightly upturned mouth
Lower jaw fits into a notch; scales are thin and shed easily

Habits

Schools in brackish inner bays and estuaries, tolerating low salinity
Feeds on plankton in the upper water layers
Moves into harbours and along pier walls in summer and autumn
Very quick and nervous in the school — bites are light and fast
A staple of Okayama's mamakari preparation, marinated in vinegar

Distribution

Regional coverage expanding

Where to find them

Okayama coast piers, Seto Inland Sea
Ariake Sea estuary piers
Inner Tokyo Bay harbour piers

Where they live

Inner bays and brackish estuariesHarbour basins and pier shadowsShallow sandy-mud flats near river mouths

How to catch them

Pier sabiki in the harbour shade Shore

Rig: Ultralight rod with a fine sabiki rig of small hooks, dropped along pier pilings and harbour walls where the school holds in shade

Bait/lure: Bare sabiki hooks with ami krill chum

Key tip: Use the smallest hooks you have — this fish has a tiny mouth and drops oversized hooks.

Small float rig with krill Shore

Rig: Light float rig with a single small hook under a small float, fished at school depth in calm harbour water

Bait/lure: A single ami krill or tiny krill piece

Key tip: Watch for the faintest float dip; bites are extremely light and fast.

Best baits & lures

Ami krillSabiki rigs with small skin hooksTiny pieces of krill

Techniques for Japanese Sardinella →

Baseline setup

Rod: Ultralight spinning rod 6-8 ft (1.8-2.4 m)
Line: 4-6 lb mono
Terminal: Fine sabiki rigs size 3-6 hooks, small floats, split shot

Recommended gear for this species

Rod · Best value

7'6" medium-heavy jigging rod

≈ US$110-170

Works 2-6 oz jigs over rock and reef and still has the backbone to lift a halibut off the bottom.

Line · Budget

50 lb braid with 40 lb leader (200 yd)

≈ US$25-40

Thin braid cuts the current so jigs stay vertical; the leader shrugs off rock and teeth.

Terminal · Budget

Leadhead jigs, swimbaits and two-hook bottom rigs

≈ US$25-40

A leadhead with a swimbait tail is the universal bottom-fish catcher, from rockfish to cod to flounder.

Picks come from our rule library — never paid placements. Prices are guides; affiliate links may earn us a commission.

Typical size

Common 4-6 in (10-15 cm); large fish to about 8 in (20 cm)

On the table

Good marinated — bony fresh, but excellent as Okayama-style mamakari in vinegar; freshness fades fast.

Similar species

Japanese SardineThe Japanese sardine is slimmer with a row of dark spots along the flank and no single shoulder spot; the sardinella is deeper-bodied with one dark shoulder spot

Regulations vary by area and can change in-season — always check the official rules for your area before you fish. Regulations guide →

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