When a fish finally rolls beside the boat, nobody wants to find out their gaff is too small, too long or just wrong for the job. That last few seconds is where good gear earns its keep, and choosing the right gaff size is less about guesswork and more about matching the tool to the fish, the boat and how you actually fish.

This guide to fishing gaff sizes is built for anglers who want practical answers. If you are chasing school tuna offshore, picking up snapper from a higher gunwale, or setting up for larger pelagics, the right gaff size changes how cleanly and safely you land fish.

What gaff size actually means

When anglers talk about gaff size, they usually mean two things - the hook gap and the handle length. Both matter, and one without the other can leave you with a setup that looks fine in the shed but feels awkward on the water.

The hook gap is the distance across the inside of the hook. A wider gap gives you more bite on thicker fish, especially broad-bodied species like tuna, kingfish and larger reef fish. A smaller gap suits lighter work where you want control rather than brute force.

Handle length is just as important. A short handle gives you accuracy and better control at boatside. A longer handle helps when you need reach, whether that is from a higher-sided boat, over an outboard, or when the fish is not coming in close enough for a short-shot lift.

A practical guide to fishing gaff sizes by target fish

There is no perfect one-size-fits-all gaff. The right choice depends on the average fish you are actually landing, not the one fish of a lifetime you hope turns up once a season.

Small fish and light inshore work

For fish around the 2kg to 8kg mark, a small gaff is usually the better tool. Think squid boats picking up bycatch, snapper, smaller mulloway, salmon, bonito and school-size tuna. In this range, a hook gap around 2 to 3 inches with a shorter handle often makes sense.

A smaller gaff is quicker to place and easier to control in close. That matters when fish are green at the side of the boat and you only get one clean shot. Go too big here and the hook can be clumsy, heavy and more likely to bounce off or tear.

Medium fish and all-round offshore use

For many South Australian anglers, this is the sweet spot. If you regularly fish for decent snapper, kingfish, larger tuna, big mulloway or solid reef species, a mid-size gaff is usually the best all-round option. A hook gap of roughly 3 to 4 inches with a handle length that matches your boat setup covers a lot of ground.

This size gives enough bite for thicker fish without becoming overkill. It is the kind of gaff many anglers leave rigged and ready because it handles most common offshore and coastal scenarios well.

Large pelagics and heavy-duty work

Once you are dealing with serious tuna, big kingfish, sharks or any fish with genuine weight and shoulder, you need a larger gaff. That often means a 4-inch-plus hook gap and a stronger, longer handle built for lift and reach.

This is where under-sizing becomes a real problem. A small hook might still stick, but it may not hold cleanly under load, particularly if the fish lunges. Big fish put stress on every part of the tool, so strength and size need to match.

Handle length matters more than most anglers think

A lot of people focus on hook size first and only think about handle length later. On the boat, it is often the other way round. If the handle does not suit your height, deck space and freeboard, the gaff becomes harder to use no matter how well-sized the hook is.

On smaller trailer boats and centre consoles, a shorter gaff is often easier to manage. You can keep it close, move around quickly and make a more controlled shot. In tight spaces, a long handle gets in the way, especially with rods, outriggers, railings and more than one angler moving about.

On larger boats or when fishing from a higher side, extra reach helps. If you need to lean too far over to gaff a fish, the setup is wrong. A longer handle lets you stay balanced and make a safer lift.

The trade-off is control. The longer the handle, the more awkward the angle can feel, particularly with smaller fish. That is why many experienced anglers end up with more than one gaff instead of trying to make a single model cover every job.

Fixed gaff or flying gaff

For most inshore, reef and general offshore fishing, a fixed gaff is the practical choice. It is simple, quick to grab and ideal for fish you plan to boat cleanly in one movement. If you are chasing the majority of common species around SA, a good fixed gaff in the right size will do the job.

A flying gaff is a different category altogether. It is built for larger fish where a fixed gaff may not give enough security once the fish is hit. These are more specialised tools for serious heavy game situations, and they come with more rigging and more complexity.

If you do not specifically need a flying gaff, you probably do not need one. Most anglers are better served by buying a fixed gaff that matches their normal fishing rather than overcomplicating the setup.

How to choose the right size for your boat and fishing style

Start with the fish you most often keep, not every species you might encounter. If your regular trip means school tuna, snapper and salmon, an oversized heavy gaff is not helping you. If your season revolves around larger kingfish and bigger tuna, a light inshore gaff will feel underdone very quickly.

Then think about where the fish is landed. If you fish from a low-sided boat and can bring fish in close, you can usually run a shorter handle. If your boat sits higher, has a wide beam or forces you to reach around the motor, add length.

Finally, be honest about who is using it. A long, heavy gaff may suit one experienced angler perfectly and feel terrible in someone else’s hands. The best gaff is one you can place cleanly, quickly and confidently when the fish is moving.

Common sizing mistakes

The biggest mistake is buying too large because bigger feels safer. In practice, oversized gaffs are harder to control and often less accurate on everyday fish. If most of your catch is medium-size, choose a proper medium setup instead of buying for the rare giant.

The second mistake is ignoring handle length. Plenty of anglers buy a hook size that suits the fish, then discover they cannot get the right angle at boatside. Reach is not a luxury. It is part of landing fish cleanly.

The third mistake is using the gaff as a lifting tool beyond its design. Even the right size gaff can be stressed if you are swinging heavy fish carelessly or lifting at bad angles. Match the tool to the load and use steady technique rather than brute force.

One gaff or two?

If you only want one gaff, go for the size that matches your most common target species and your boat height. For many anglers, a mid-size fixed gaff is the best compromise. It covers the broadest range without becoming awkward for day-to-day use.

If you fish across very different styles - for example, inshore snapper one weekend and larger offshore pelagics the next - owning two gaffs is often the smarter buy. A smaller, more controlled option for close work and a larger reach gaff for heavier fish makes life easier and usually lands fish more cleanly.

That is often better value in the long run than buying one compromise tool that is never quite right.

Material and build still matter

Size is only part of the story. A correctly sized gaff with a poor handle, weak hook or slippery grip is still a bad choice. Look for solid construction, secure grips and corrosion resistance, especially if your gear lives in saltwater conditions and gets used hard.

A lighter gaff can feel great in the hand, but not if it flexes too much under load. A heavier-duty model may be worth it if you regularly target stronger fish. Like most tackle decisions, the best choice sits somewhere between comfort and strength.

If you are building out a proper landing kit, it makes sense to shop the same way you would for rods, leaders or terminal tackle - by species, by use case and by what actually works on your boat. That is exactly how we approach gear at Reel ’N’ Deal Tackle.

The right gaff size makes the last moment easier

A good gaff should feel like part of the plan, not a panic grab once the fish is colour-side. Match the hook gap to the fish, the handle length to the boat, and the build to the work you expect it to do. Get that right, and the next time a proper fish comes alongside, you will be ready to finish the job cleanly.