Dolphinfish (Mahi Mahi): The Complete Australian Fishing Guide

Photo courtesy of Oz Fish and Game

Dolphinfish (Mahi Mahi)

Scientific name: Coryphaena hippurus
Common names: Dolphinfish, Mahi Mahi, Dolphin Fish, Dorado
Average size: 5–15 kg
Trophy size: 20 kg+
Activity pattern: Fast-moving pelagic predator, highly visual and structure-oriented offshore

Distribution and key locations (Australia)

Dolphinfish are one of Australia’s most exciting bluewater sportfish. Renowned for their brilliant colours, aerial displays, and aggressive feeding behaviour, they inhabit warm tropical and subtropical waters around much of northern and eastern Australia.

Prime regions

QLD: Entire coast, especially offshore reefs and FADs
NSW: Offshore current systems and continental shelf waters
WA (north): Kimberley, Pilbara and Ningaloo regions
NT: Offshore reef systems and current lines
Coral Sea: Offshore banks, reefs and floating structure

High-percentage areas

Fish Aggregating Devices (FADs)
Floating debris and drift lines
Offshore reefs and pinnacles
Current edges and temperature breaks
Pressure points where currents converge
Areas holding flying fish and bait schools

Mahi Mahi are strongly attracted to anything floating. If you find offshore structure holding bait, there’s a good chance dolphinfish are nearby.

Habitat features to look for

Dolphinfish are open-water hunters that use floating structure as shelter, ambush points, and feeding stations.

Key structure

FADs and navigation buoys
Floating logs and debris
Weed lines
Offshore reef edges
Current lines
Pressure zones between water masses

Food sources

Flying fish
Pilchards
Slimy mackerel
Garfish
Small tuna
Squid

Water conditions

Clean blue water
Strong ocean current
Water temperatures generally above 22°C
Visible bait activity

If you find warm blue water, current, and floating structure, you’re in dolphinfish territory.

Seasonal patterns

Dolphinfish movements are heavily linked to warm currents and seasonal water temperatures.

Best seasons

QLD: Spring through autumn (peak summer)
NSW: Late spring through autumn
WA (north): Dry season through summer
NT: Most productive during stable dry-season conditions

Seasonal notes

Warm-water years often produce exceptional fishing
Larger fish frequently arrive later in the season
Juveniles often school around FADs
Isolated floating objects can hold fish for extended periods

Unlike tuna, mahi mahi are often highly structure-dependent and may remain around productive floating objects for weeks.

Weather and conditions (critical)

Ideal conditions

Warm blue ocean water
Defined current lines
Moderate current flow
Calm-to-moderate seas
Visible bait activity

Best fishing conditions

Floating structure holding bait
Weed lines with current movement
FADs with active fish beneath
Bird activity offshore

Avoid

Green or dirty water
Cold-water intrusions
Dead current conditions
Structure with no bait present

Many offshore anglers pass directly over dolphinfish because they fail to inspect floating objects closely.

Bait – what actually works

Dolphinfish are opportunistic feeders and generally less selective than tuna or marlin.

Top natural baits

Live slimy mackerel
Live yakkas
Live pilchards
Garfish
Flying fish
Whole squid
Tuna strips

Bait rules

Live bait is difficult for large mahi to ignore
Match local bait size
Fresh bait outperforms old frozen offerings
Active presentation often matters more than scent

Once one fish is hooked, additional fish often remain around the boat.

Tackle and rigs

Dolphinfish fight with speed, jumps, and relentless direction changes rather than raw brute strength.

Rod and reel

Rod: 6–8 ft spin or overhead rods (10–24 kg)
Reel: 5000–10000 size spin reels or small overheads
Line: 20–50 lb braid
Leader: 40–80 lb fluorocarbon

Terminal gear

Strong live-bait hooks
Circle hooks
Heavy-duty swivels
Light wire rigs rarely required

Common rigs

Unweighted live bait rigs
Slow-trolled live bait rigs
Pilchard drift rigs
Surface skip bait rigs

Heavy tackle reduces sport and is usually unnecessary unless very large fish are expected.

Lures (when and why)

Dolphinfish are among the most lure-friendly gamefish in Australia.

Effective lures

Small skirted trolling lures
Stickbaits
Surface poppers
Metal slugs
Soft plastics
Diving minnows

When to use lures

Searching large offshore areas
Around FADs and weed lines
Surface-feeding fish
Active bait schools

Retrieval style

Fast and erratic
Surface disturbance
Aggressive sweeps and pauses
High-speed trolling presentations

Mahi Mahi are visual predators and often attack lures within sight of the boat.

Berley and teasing

One of the most effective ways to keep schools around the boat.

Effective berley

Pilchard cubes
Chopped baitfish
Fish frames
Small strips of tuna

Key principle

Once a fish appears, keep small amounts of bait entering the water consistently.

Entire schools can remain behind a boat for extended periods if fed carefully.

Time of day

Best: Dawn and early morning
Daytime: Excellent whenever fish are active around structure
Overcast conditions: Often productive throughout the day

Unlike many pelagic species, dolphinfish frequently feed aggressively under bright sunlight.

Common mistakes

Ignoring floating debris
Trolling too far from FADs
Leaving fish too quickly after a hookup
Fishing cold or dirty water
Using excessively heavy tackle
Failing to carry live bait options

Many anglers catch one mahi mahi and leave, unaware that an entire school is often still beneath the boat.

Final rule of dolphinfish fishing

Find warm blue water + current + floating structure + bait — then investigate every object thoroughly.

Successful mahi mahi anglers treat every FAD, weed line, buoy, and floating log as a potential hotspot. Cover water efficiently, stay observant, and never ignore signs of life around offshore structure. When conditions align, few Australian gamefish are more spectacular, aggressive, or accessible than dolphinfish.