Bluewater hunting is spearfishing stripped to its purest question: you, drifting in open ocean over hundreds of meters of water, waiting for a fish that outweighs you to swim out of the blue. No reef, no kelp, no bottom — just current, chum and patience. It's the most demanding type of spearfishing and the least forgiving of shortcuts. This guide explains what bluewater hunting actually is, the pelagic species it targets, how drifts, chum and flashers bring fish to a drifting diver, the specialized breakaway rigs the fish demand, the head game of hunting with no bottom, and what to expect from your first trip.
What counts as bluewater hunting
Bluewater means open ocean over great depth — water where the bottom plays no part in the hunt. The boat runs divers out to current lines, temperature breaks, seamounts or FADs, then conducts long drifts: divers drop in up-current and drift, sometimes for kilometers, while the boat shadows their floats and collects them at the end. Of all the types of spearfishing, this is the one that most resembles big-game hunting: hours of nothing punctuated by minutes that spike your heart rate for a week.
The target species: tuna, wahoo, mahi and beyond
The bluewater list is the sport's trophy shelf: yellowfin and other tunas, wahoo, mahi mahi (dorado), amberjack on the structure edges, and — for the small elite at the sport's very top — marlin and other billfish, plus giant trevally where the blue meets Pacific reef. Every one of them is fast, powerful and built to punish tackle. That's why the fish, not the diver, dictates the gear: the difference between a landed tuna and a lost shaft is almost always rigging, not aim.
Drifts, chum and flashers: bringing fish to you
You cannot search open ocean; it's too big. Bluewater hunting works by making one patch of empty water interesting:
- The drift puts you on a moving feature — a current edge, a bait line — instead of a fixed point.
- Chum builds a scent lane down-current that fish follow up to its source, which is you.
- Flashers — mirrored, fluttering attractors hung beneath your float or dropped on a line — imitate the panic-glint of baitfish and pull curious pelagics in from the edge of visibility.
The diver's job is to hang quietly near the attraction, scanning the blue in slow sectors, and to be ready in the ten seconds between "empty ocean" and "fish in range." They arrive without warning, inspect fast and leave faster.
Bluewater rigs: breakaways, reels and floatlines
A reef gun and a wrist lanyard will get someone hurt out here. The bluewater standard is the breakaway rig: the shooting line separates from the gun on impact, transferring the fight through a bungee and floatline to one or more large floats — the fish fights the ocean's drag, not your arms, and the gun stays in your hands instead of disappearing toward the bottom. The supporting cast: long two-to-four-band guns (130 cm and up) or rollers with the range and punch for thick-bodied fish, slip-tips that hold in soft flesh, hard floats rated for depth, and bungee sections that absorb the first devastating run. Rig every connection as if a 60-kilo fish will test it today, because one might.
Hunting with no bottom: focus and sensory drift
The strangest part of bluewater is psychological. With no bottom reference, no structure and nothing moving, the brain under-stimulates — divers describe a drowsy, dream-like drift after long empty spells, a mild sensory deprivation that dulls exactly the readiness the moment demands. The counters are structural: hunt in defined scan patterns (slow sectors, near to far), rotate diving and surface-watching with your buddy so attention gets breaks, use the flasher as a visual anchor, and reset with a purposeful breathe-up before each drop. Treat focus like breath-hold: a finite resource you spend deliberately.
Your first bluewater trip: what to expect
Come honestly prepared: comfortable 20 m+ diving ability, solid one-up-one-down discipline and reef-proven hunting instincts are the entry ticket — bluewater is a graduation, not a starting point. Book with an experienced bluewater operation for the first trips; their drift management and rigging knowledge is half the sport. Expect long empty hours, expect to blow your first shot at a real fish (everyone does — the size messes with your range judgment), and expect the moment a tuna materializes from nothing to reorganize your entire relationship with the ocean. Also budget realistically: the boats, the fuel and the specialized gear make this the sport's expensive branch. It's worth it exactly once you're ready for it.
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