EXMOUTH & NINGALOO BLACK MARLIN — A LIGHT-TACKLE PLAYBOOK

The basics, fast

Black marlin (Istiompax indica) are the billfish that made Exmouth's name. The reason is geography: at North West Cape the continental shelf swings in close to the coast, so deep blue water sits within a short run of a trailer-boat ramp. Almost nowhere else in Australia puts marlin that near a concrete slab.

What most people mean by "Exmouth marlin" is actually two different fisheries, separated by a thin strip of land:

• Exmouth Gulf, on the eastern side of the cape — shallow, sheltered, turbid in places, and internationally known for juvenile black marlin. Small fish, in numbers, on gear light enough to make it sporting. This is the fishery that draws light-tackle and fly anglers from overseas.
• The Ningaloo drop-off, on the western side — the reef edge and the deep water immediately outside it. Bigger blacks, blue marlin further out, wahoo and mahi on the same trolled lures. Exposed, and it fishes only when the swell and the sea breeze let it.

Fish both and you are running two different boats' worth of tactics. Plan for one and you will fish it twice as well.

What this guide will not tell you

Worth saying up front, because most writing about this fishery is charter marketing and reads as though every day is a good one.

No GPS marks. The productive ground here moves with the water, not with the chart. A list of waypoints copied off a forum is worth less than knowing which edge to look for, so that is what this page is about.

No bag limits or zone boundaries quoted. Western Australian recreational rules are set by DPIRD and the Ningaloo Marine Park zoning is administered separately, and both change. Numbers printed in a blog post age badly and the fine is yours, not ours. Both sources are named at the bottom of this page — read them for the season you are actually fishing.

And a limit of our own product, stated plainly. Fishare's ocean model covers the AU West Coast region, and in that region it scores seven offshore pelagics: yellowfin, mahi mahi, southern bluefin, black marlin, blue marlin, striped marlin and wahoo. Black marlin is in that list, which is why this guide exists. But sailfish and Spanish mackerel — which is what a great many Exmouth charters actually chase — have no model here at all, and neither do the demersals the rest of WA lives for: dhufish, pink snapper, baldchin groper. The shelf-break model these seven ride reads fronts and slope, and it cannot represent a bottom fish. If you are chasing sailfish off Exmouth, use our SST and current layers as ocean information and ignore any species score you see; there isn't one for your fish.

Season — when the blacks run

Treat every month below as the shape of a normal year, not a promise about this one.

The Gulf's juvenile black marlin fishery is a warm-season event. It builds through spring as the water warms and the bait concentrates, and the strongest stretch is generally the last few months of the calendar year. Numbers of small fish, often close in, often visible on the surface — which is exactly why light tackle works here and why the fishery has the reputation it does.

Outside the Gulf, on the deep side, the pattern stretches later. Blue marlin are a hot-months proposition and are found wider and deeper than the blacks. Sailfish overlap the same warm window inside and around the Gulf. Wahoo and mahi mahi come along as by-catch on trolled lures for most of the warm half of the year, and are the reason a "marlin day" that produces no marlin is rarely a blank.

Exmouth also has a genuine game-fishing culture around it — the Exmouth Game Fishing Club runs the long-standing GAMEX tournament annually, and tournament weeks are the one time the boat ramps are the busiest thing in town. If you are trailering, it is worth knowing whether you are arriving into one.

The ramps, and what each one commits you to

Your launch point decides which fishery you get, how far you steam, and how bad the trip home is when the breeze comes up.

Tantabiddi — the Ningaloo side

The main west-side launch, north of the Ningaloo reef's tourist end. From here the reef edge and the deep water outside it are the close option, and this is the ramp you use when you want the drop-off. It is also the whale-shark tourism ramp for a good part of the year, so expect company and expect the car park to be full early. Tantabiddi ramp conditions.

Exmouth Boat Harbour and the town ramps — the Gulf side

The all-weather option, on the sheltered eastern side by the town. This is the base for the Gulf's light-tackle fishery, and it is the ramp that still works on a day the west side has been blown out since ten in the morning. Exmouth Boat Harbour conditions.

Bundegi — the top of the Gulf

Up near the tip of the cape on the Gulf side, roughly 15 km in a straight line from the boat harbour. The attraction is that it puts you closest to the northern end of the cape, where fish moving around the top can be intercepted without the long run from town. Bundegi ramp conditions.

Coral Bay — the southern option

About 140 km south of Exmouth as the crow flies, and further by road. A separate base rather than a day trip, with its own stretch of Ningaloo outside it. Coral Bay ramp conditions.

The number worth holding on to: Tantabiddi and the boat harbour are under 20 km apart in a straight line, which is a short drive with the boat on the trailer. On this cape, changing ramps is a cheaper answer to bad wind than pushing into it. Anglers who plan one launch and stick to it lose days that the drive would have saved.

Reading the water

The same four signals matter here as anywhere offshore. What changes is how close to shore you find them.

The shelf edge

This is the whole reason the fishery is accessible. On the west side the bottom falls away hard just outside the reef, so the structure that concentrates pelagic bait is close enough for a trailer boat to reach and get home from. Work the edge, not the open blue past it.

Temperature breaks

The Leeuwin Current carries warm tropical water south along the WA coast, and in the warmer months a wind-driven inshore flow can push the other way. Where those bodies of water meet you get a front, and fronts are where the bait sits. A sharp break beats a warm average every time — a degree of change across a short distance is worth more than a degree of absolute temperature.

Colour and chlorophyll edges

The Gulf is naturally more turbid than the reef side. That is not a defect; the colour line where green Gulf water meets blue is a hard edge of exactly the kind that holds bait. Learn to fish the line rather than to look for clean water.

Bait, birds and the surface

Juvenile blacks in the Gulf are often a visual fishery. Fish showing on the surface, working bait, in water shallow enough that you would not believe a marlin was in it. Time spent looking is not time wasted here in the way it is when you are grinding a temperature break offshore.

Wind — the fact that decides your day

If you learn one thing about fishing North West Cape, learn this one.

Through the warm months this coast runs a hard and dependable sea-breeze cycle. Mornings are frequently the calmest part of the day; the southerly builds through the middle of it and can be genuinely unpleasant by mid-afternoon, especially on the exposed western side. It is not a storm and it is not unusual — it is the normal daily pattern, and it is strong enough that the Ningaloo side can be comfortable at seven and unfishable at two.

What follows from that:

• Start early, and mean it. A dawn launch is not enthusiasm here, it is the plan.
• Have the Gulf as your fallback. The eastern side sits in the lee of the cape for a southerly, which is precisely why the light-tackle fishery there is so reliable in the afternoon.
• Decide the ramp on the forecast, not the night before. See the previous section on the drive being cheap.
• Read swell separately from wind. A calm morning with old swell still running can make the reef passages the most dangerous part of the trip, and they do not care that the water looks flat.

Tackle — what light tackle actually means

The Gulf is one of the few places in the world where going deliberately light is the sensible choice rather than a stunt.

Juvenile black marlin are small billfish. Fished on heavy gear they are landed in a couple of minutes, which is both dull and hard on the fish. The reason the fishery is famous is that you can drop to light line and get a real contest, and the fish still swim away.

• Line class. The Gulf fishery is traditionally fished on the light end — think single-figure to mid-teens kilo classes — and matched to the fish rather than to the worst case. Outside on the drop-off, where a much bigger black or a blue is genuinely possible, step up.
• Lures. Small skirts and swimming baits, run tight and visible. The point is to raise fish you can then present to, not to cover water at speed.
• Switch-baiting. Raise on a hookless lure or teaser, then present a bait to a lit-up fish. It is the standard light-tackle approach for a reason: you choose the moment, which is what makes light line survivable.
• Circle hooks. Now the default for billfish bait fishing, because they overwhelmingly find the corner of the jaw. Better hook-up rate on a dropped-back bait and a dramatically better release.
• Leader you can hold. Wind-on or a leader length you can actually manage boat-side with one hand while the other works. Most billfish are lost, and most are hurt, in the last three metres.

Handling and release

Australian recreational billfish are released as a matter of course. Doing it properly is a skill, not a good intention.

• Keep the fight short for the fish, not for you. Light line is sporting when the fish is small and the fight is quick. A marlin fought to exhaustion on gear that is too light is not a light-tackle capture, it is a dead fish that swam away.
• Leave it in the water. No lifting a billfish by the bill, no boat-side gaff, no deck.
• Cut the leader if you have to. A hook left in beats a fish worked over for ten minutes to retrieve it.
• Revive facing forward, water moving through the gills, until it takes itself away. Do not hurry the last part.
• Tag if you are set up for it. Australian game-fishing clubs run tagging programs, and this fishery's juvenile fish are exactly the size class that makes a recapture worth something scientifically.

Rules, and the zoning that catches people out

Two separate rule sets apply on this coast, and being right about one does not help you with the other.

Fishing rules — bag and size limits, licence requirements, gear rules — come from the Western Australian Department of Primary Industries and Regional Development. They are not the east coast's rules and they are revised.

Where you may fish is a different question. Ningaloo Marine Park is zoned, and the zoning includes sanctuary zones in which fishing is prohibited outright. The boundaries are not intuitive from the water, they are not all the same, and they have been changed. This is the single most common way a visiting angler on this coast ends up in trouble — not by keeping the wrong fish, but by catching a legal fish in a place where fishing is not allowed. Get the current zoning map before you launch, and have it on board.

Neither of those is something to take from a guide written months before your trip, including this one.

Common mistakes

• Treating the Gulf as the consolation prize. It is the fishery with the international reputation. The drop-off is the bigger-fish option, not the better one.
• Fishing the middle of the day on the west side. See the wind section. You are not unlucky, you are late.
• Gear that is too heavy for the Gulf. It converts the best light-tackle billfish fishery in the country into a winch exercise.
• Looking for clean blue water inside. The colour line is the target.
• Assuming a species score exists for your fish. If you are on sailfish or Spanish mackerel here, there is no model — use the ocean layers and your eyes.
• Trusting last year's zoning. It changes, and the map is free.

The honest truth about fishing Exmouth

It is a very long way from anywhere. The town is small, the ramps get busy, the wind is a daily opponent rather than an occasional one, and the fishery is seasonal enough that a badly-timed week can produce nothing but wahoo and a sunburn.

Set against that: there are not many places on earth where you can launch a trailer boat, be in billfish water inside an hour, and have a realistic shot at a marlin on gear light enough to feel every part of it. The Gulf's juvenile fishery is a genuine world-class oddity, and the fact that it sits a fifteen-minute drive from a sheltered all-weather ramp is what makes it reachable for people who do not own a game boat.

Pick your week for the season, pick your morning for the wind, pick your ramp on the forecast, and know which of the two fisheries you are fishing before you launch. That is most of it.