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Argyrosomus japonicus

Mulloway · fishing, baits & best season

The Mulloway, also called Jewfish, is Australia's premier estuary predator. Can exceed 30 kg and catching one is considered a milestone for any angler. Hunts mainly at night and du…

Mulloway — Argyrosomus japonicus

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Size50-120 cm
Weight3-30 kg
Depth5-150 m
Difficulty★★★★
Lifespan30 years
FamilySciaenidae

Overview

The Mulloway, also called Jewfish, is Australia's premier estuary predator. Can exceed 30 kg and catching one is considered a milestone for any angler. Hunts mainly at night and during rough conditions. Requires great patience and technique.

Identification

Large headWide mouthPronounced lateral lineLarge scalesSeparated dorsal finsArched backGolden stripesStrong first dorsal fin spine
Body
The Mulloway's body is elongated and robust, with a well-defined lateral line.
Colouration
Silvery color with golden highlights and paler sides, dark fins.
Sexual dimorphism
Absent/slightly evident
Growth
Moderate, reaching considerable sizes in a few years.

Taxonomy

Family
Sciaenidae
Order
Perciformes
Class
Actinopterygii

Related species

Argyrosomus regiusArgyrosomus inodorusArgyrosomus coronusArgyrosomus thorpeiArgyrosomus beccus

Habitat & distribution

Environment
Coast, Estuaries, Ports
Preferred bottom
Sand, Mud, Seagrass
Geographic distribution
Found along the southern coasts of Australia, also present in parts of Japan and South Africa.
Micro-habitat
Often hides near submerged structures or vegetation to hunt prey.

Prefers environments with turbulent waters where murky conditions enhance its predatory abilities.

Presence by sea area

Au Gbr SudPeak
Au Costa Est TemperataPeak
Au Costa SudPeak
Au Costa Ovest TemperataPeak

Diet

Primary prey
fish, squid, crustaceans
Secondary prey
shrimp, cuttlefish, crabs
Occasional prey
octopus, mullet
Feeding behaviour
Opportunistic predator, mainly hunts at night and during stormy conditions, using its keen vision and senses to locate prey.
Natural predators
sharks, seals, dolphins

Adopts an ambush hunting strategy, using vegetation and structures to hide from prey.

Behaviour

Activity
nocturnal
Social behaviour
small_groups
Aggressiveness
medium
Migration
Some individuals migrate to deeper waters for breeding.
Seasonal behaviour
Primarily active during warmer months, with increased presence in coastal areas.
Juveniles
Young tend to stay near estuarine waters where they find protection and abundant food.
Adults
Adults may move in small groups or alone, especially during hunting periods.

Reproduction

Spawning season
October, November, December
Spawning depth
between 20 and 60 meters
Eggs
Small pelagic eggs, very numerous.
Larval stage
Larvae are transparent with a prominent oil vesicle that ensures buoyancy.
Sexual maturity
4-5 years

When to catch Mulloway

Activity calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PeakGoodLowInactive

Activity by season

Spring
85%
Summer
95%
Autumn
85%
Winter
60%

Best times

DayDusk, Dawn
NightNight

This species shows peak fishing activity in spring, summer and autumn, when the productivity index (FPI) reaches its highest values.

Fishing activity decreases in winter, when conditions are less favourable.

Ideal conditions

Water temperature

10°COptimal zone: 14-24°C27°C
Preferred tide: moving

Where to catch it

Best spots

river mouthspierssandy areasnear submerged structures

Bottom preference

Rock
100%
Mixed
90%
Posidonia
70%
Sand
50%
Mud
30%

Spot type

Cliff
100%
Reef
100%
Harbour
80%
Pier
80%
Boat
60%
Beach
40%

Fishing techniques

Recommended

surf fishingdrift fishingbottom fishinglive bait trolling

Other applicable

SurfcastingBeach FishingPesca A FondoLive BaitingSurfcasting PesanteSurfcasting NotturnoBeach LedgeringPesca A Mosca In MareSpinningSpinning LeggeroStreamerSurfcasting Medio

Recommended baits

live fishsquidshrimpcuttlefish

Baits by pressure

Low
Jerkbait affondanteJig head + softbaitPaddle tail softbaitShad softbaitSoft plastic grande (20-30cm)Vibe lure / BladeMetal jig medio (40-100g)
Medium
Calamaro interoCalamaro vivoCefalo vivoPezzo di pesceEsca viva (generica)Gambero vivoPinfish vivo
High
Beach wormVerme di sangue

How to really catch it

Mulloway is a powerful, mobile predator, with a large head, wide mouth, and a pronounced lateral line that reveals its nature as a coastal hunter. When the sea darkens and the water starts moving, it truly comes alive: that is when it is worth targeting with method and composure.

🐟 Good to know

One lesser-noticed biological detail is that its eggs are pelagic and very numerous, while the larvae are transparent and carry a prominent oil vesicle that helps them stay afloat. It is a reproductive strategy typical of fishes that rely on marine currents to disperse their earliest life stages.

🌊 Where & when

It lives over sand, mud, and seagrass bottoms along coasts, estuaries, and ports, often close to submerged structure or vegetation where it ambushes prey. It becomes especially relevant in the warmer months and remains highly fishable from March to November, particularly at night and in rough water; between October and December some fish also move into deeper water to spawn.

🎣 How to really catch it

For mulloway, surf fishing is the most concrete approach: a sturdy surfcasting rod, 20-30 lb braid, a 40-50 lb fluorocarbon leader, large circle hooks, and a bomb sinker let you present squid, cuttlefish, shrimp, or live fish effectively. Work river mouths, piers, and sandy areas near submerged structure, keeping the bait on the bottom at night or during stormy conditions, when this opportunistic predator is actively hunting.

💡 The detail that makes the difference

The most reliable tip is to think about the path of the prey, not just the spot that looks fishy. Since it hunts near structure and vegetation over soft bottoms, it often pays to place the bait along the edge between open sand or mud and nearby cover: that is where a nocturnal predator finds natural travel lanes and easy chances.

Catch & handling tips

Fight
Fights vigorously, using its strength and the current.
Handling
Handle with care to avoid injury, especially to the jaws and dorsal fins.
Release
Release quickly after oxygenating, avoiding unnecessary trauma.

Curiosities & culture

Record catches
Maximum documented size: up to about 181 cm and 75 kg (source: FishBase). There is no official global IGFA All-Tackle record; the largest documented recreational catches exceed 40 kg (Australia).
In the kitchen
Mulloway's meat is white and firm, ideal for grilling and stewing.
Cultural notes
Mulloway is a highly prized game fish in Australian sportfishing, often linked to tales of large night catches.
Historical notes
Traditionally fished by Australian Aboriginal communities, it plays an important role in their food culture and storytelling.

Fishing guides for this species

Frequently asked questions

What is the best season to catch Mulloway?

March, april, may, june, july, august, september, october, november. This species shows peak fishing activity in spring, summer and autumn, when the productivity index (FPI) reaches its highest values.

Which techniques work best for Mulloway?

surf fishing, drift fishing, bottom fishing, live bait trolling

What does Mulloway feed on?

fish, squid, crustaceans

At what depth does Mulloway live?

5-150 m. Often hides near submerged structures or vegetation to hunt prey.

Which baits work best for Mulloway?

live fish, squid, shrimp, cuttlefish

Where can you catch Mulloway?

river mouths, piers, sandy areas, near submerged structures

Related species

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