Saltwater · Summer to autumn in southern coastal waters

Japanese Scad

Decapterus maruadsi

A small, round-bodied scad of southern Japan, taken in mixed sabiki catches from piers and boats alongside the better-known Japanese jack mackerel. Against the jack mackerel it is the rounder fish: deeper and more rounded in cross-section, with its hard scutes confined to the rear, straight part of the lateral line rather than running its whole length.

Seasons · Peak

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Japanese Scad — Photo: (Temminck and Schlegel), Public domain — Wikimedia Commons (Historical scientific illustration — the only clear Commons image of this species.)

Identifying features

Round, moderately deep silvery body — rounder than the jack mackerel
Hard scutes only along the rear straight part of the lateral line
A small finlet behind the dorsal and anal fins
Yellowish tint on the tail in fresh fish
Small dark spot sometimes visible at the upper edge of the gill cover

Habits

Schools in warm southern coastal water, often mixed with other small carangids
Feeds on small crustaceans, plankton and tiny fish
Taken mostly as a mixed sabiki catch rather than a target
Its relative muroaji (Decapterus muroadsi) is a very similar scad of the same southern catches, separable only by fine finlet and scute details
Most common from Kyushu and Shikoku southward in summer and autumn

Distribution

Regional coverage expanding

Where to find them

Southern Kyushu fishing piers
Kochi coast harbour piers, Shikoku
East China Sea coastal fishing boats

Where they live

Southern coastal bays and harbour mouthsOffshore schools over sandy bottom in the southMixed sabiki schools with jack mackerel and sardines

How to catch them

Pier sabiki in the south Shore

Rig: Light rod with a sabiki rig dropped beside southern piers and harbour walls, worked at the school's depth with krill chum

Bait/lure: Bare sabiki hooks with ami krill chum

Key tip: Mixed schools are the norm — sort the catch by body shape, rounder fish are scad.

Boat sabiki over offshore schools Boat

Rig: Boat rod with a sabiki rig fished at the marked school depth over sandy bottom, chummed with krill

Bait/lure: Sabiki rig with krill chum

Key tip: Keep the chum going steadily; scad schools wander off quickly without it.

Best baits & lures

Ami krill chumSabiki rigsTiny krill pieces

Techniques for Japanese Scad →

Baseline setup

Rod: Light spinning rod 7-9 ft (2.1-2.7 m)
Line: 6-10 lb mono or light braid
Terminal: Sabiki rigs size 4-8 hooks, small chum cages

Recommended gear for this species

Rod · Best value

9' 5-weight fly rod outfit

≈ US$180-260

Covers chironomid lakes and small rivers with one setup.

Flies · Budget

Chironomid assortment (30 patterns)

≈ US$25-40

Chironomids are 60% of a lake rainbow's diet in spring.

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

Typical size

Common 8-10 in (20-25 cm); large fish to about 12 in (30 cm)

On the table

Good — firm flesh for its size; grilled whole or as sashimi when very fresh.

Similar species

Japanese Jack MackerelThe Japanese jack mackerel (maaji) is slimmer, with scutes running the full length of the lateral line; the Japanese scad is rounder-bodied with scutes only on the rear straight section

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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