Walk into any tackle shop, and sooner or later you’ll find yourself standing in front of a wall of tiny metal objects that all look vaguely similar. They all have a more or less hooked shape, they all seem to be made out of metal, their names may be suspiciously suggestive (a “circle” hook?) or seem totally unrelated (“Aberdeen”? You mean like the terrier?), there are hundreds of options, dozens of sizes, and very little explanation.

The good news is that you don’t need to understand every hook on the market to start catching fish. In fact, a handful of versatile hook styles will cover the vast majority of freshwater fishing situations you’ll encounter. Once you understand what these pieces of tackle actually do, the intimidating tackle aisle suddenly starts making sense.

In this beginner’s guide, we’ll talk about what hooks do, break down hook sizes (including a fun fact about who and why invented that odd system), cover hook design and teach you some Hookese, give tips on how to choose the hook, and explain the most common hook types.

What Do Hooks Actually Do?

Hooks are often called “terminal tackle”, and for a good reason. The Latin word “terminus” means the end, the boundary, the final point, and that’s precisely where they sit: at the end of the line. In a more sinister sense, it can also relate to the impending end of the fish’s natural life cycle. Or not – depending on the catch-and-release policies on the one hand, and your skill on the other.

Think of terminal tackle as the business end of your fishing setup. Your rod helps you cast. Your reel stores and retrieves line. Your sinker brings the lure or bait to the depth where the fish can see it. Your fishing line connects everything together. Yet, one essential part is missing. If you fish with bait, it has to hang on something, and bait, lure, or fly, you must establish some kind of connection between you and the fish, so that you can take the scaly critter out of its element. That’s where a hook comes in, pun intended.

It’s not that you can’t fish without a hook. Many species of carp, for instance, suck the food into their mouths with a power stream generated by their gill covers. When they accidentally suck something that their palate identifies as indelible, they don’t spit it back out, but get rid of it through the gills. If that’s a regular pebble, that’s the end of the story. But if that something happens to be a simple coat button on a line, when the angler pulls the line, the button can’t pass back through the gills, and the carp has no option but to follow upstairs, in the general direction of the cooking pot.

But as a rule, a hook is the essential part of the rig. Get it wrong, and even the most expensive rod-and-reel combo won’t save the day.

Understanding Hook Sizes

Hook sizing confuses many beginners, with the possible exception of shotgun shooters, phlebotomists, photographers and electricians, —all of whom live in worlds where bigger numbers mean smaller things. You guessed it: The numbers get bigger as the hooks get smaller. A size 12 hook is smaller than a size 8 hook. A size 8 hook is smaller than a size 4 hook. And a size 1 hook is larger than all of them.

Who on Earth could invent such a system? Actually, it was the English, when they only started mass-producing fishing hooks (and needles). They made it out of wire. Normally, the bigger the hook, the thicker the wire you need to make it. Electricians already know where this is heading. Wire is made by dragging metal stocks through increasingly smaller holes. The thinner the wire you need, the more holes you need to drag it through. After the first one – size 1 – you have the thickest wire, after the second drag a bit thinner, and so on. So it was only natural for these English makers to adopt a system that roughly matched the hook size to the wire size.

But what if you needed a hook larger than No 1? Originally, this job was delegated to blacksmiths, but as the industry moved in, they developed a system of “aughts”: 1/0 (one-aught), 2/0, 3/0, 4/0, and so on up to 20/0. The “aughts” work in a more natural manner: a 4/0 hook is larger than a 2/0 hook.

What Does a Hook Consist of?

From the angler’s perspective, the hook begins with the “eye”. The eye is where you attack the line or leader material to the hook. It can be shaped as a structural ring, brazed loop, or flattened spade.

Extending linearly from the eye is the “shank”. The shank is the straight structural run of wire, and it determines the hook’s overall profile length. Sooner or later, the “shank” transitions into the “bend” – simply put, the crooked part of the hook. With the bend, the hook takes a U-turn and ends with the sharpened “point”.

From the fish’s perspective, it’s the point where it all begins, and very possibly ends, as the point penetrates its lip, mouth, or other tissue. In a traditional hook design, there’s also the “barb”, a reverse-facing sharpie that prevents the hook from sliding out and the fish from getting away. Most catch-and-release fisheries these days, however, require the anglers to use “barbless” hooks, that make it easier to pull the hook out without unnecessary extra trauma for the fish.

If the hook bends in a straightforward manner, so that when you lay the hook on a table, it touches the surface at all points, it’s called an “inline” hook. If the point is bent sidewards, it’s an “offset” hook. Offset hooks usually hook better, but may also do more damage to the fish, which isn’t always what we’re looking for (think catch-and-release).

Two more words that you need to add to your vocabulary are the “gap” (or “gape”) and the “throat”. The gap is the distance between the tip of the point and the shank. And if you draw an imaginary line straight from the tip to the shank, and measure the distance from that line to the deepest point of the bend, you get the throat. These acts of applied geometry can tell you volumes about the shape of the hook, what bait you can fit on it, how it’s going to perform, and even what knot to prefer.

Selecting the Right Hook Size

So, the larger the fish, the bigger the hook? Not necessarily. A fish with a bigger, harder mouth may require a bigger, sturdier hook. A large fish feeding on small, delicate stuff might call for something smaller. A 20-pound Eurasian carp, whom you sometimes catch on a single kernel of corn, may require a surprisingly tiny hook. Meanwhile, a large live minnow or chunk of cut bait needs a much larger hook, even if you’re not targeting giant fish. In fact, it’s more like the bigger the bait, the bigger the hook.

Hooks size 32 are so small, you can’t even see them very well without some magnification device. Usable fishing sizes begin at about 16, which is used for miniscule nymphs, and by size 1 we’re getting into the territory of bass, walleye, summer flounder, or mangrove snapper. A 3/0 hook provides the substantial gap necessary for rigging soft plastic jerkbaits or presenting live forage to apex predators, an 8/0 hook is engineered for heavy river catfish or coastal striped bass, and massive 16/0 to 20/0 irons provide the strength demanded by pelagic offshore fish like tuna or mahi-mahi.

The table below can serve as a rough guide to what hook to choose for what situation.

Hook Classification	Numerical Range	Effective Gap Dimensions	Representative Baits	Target Fish
Micro / Ultralight	Size #32 to #14	1.0 to 4.5 mm	Single maggots, micro-pellets, single salmon eggs, midges	Bluegill, sunfish, stream trout
Intermediate Freshwater	Size #12 to #4	5.0 to 9.0 mm	Earthworms, cut nightcrawlers, sweetcorn kernels, crickets	Yellow perch, black crappie, standard trout, coarse carp
Standard Heavy Freshwater	Size #2 to 1/0	10.0 to 14.0 mm	Whole nightcrawlers, live minnows, small crayfish	Largemouth bass, smallmouth bass, walleye
Apex Freshwater / Inshore	Size 2/0 to 6/0	15.0 to 23.0 mm	Large golden shiners, cut fish chunks, whole deadbaits	Channel catfish, flathead catfish, northern pike, red drum
Pelagic / Offshore	Size 7/0 to 20/0+	over 23.0 mm	Whole bunker, rigged ballyhoo, whole skipjack, large live finfish	Striped bass, tarpon, giant bluefin tuna, billfish, sharks

The Four Hook Types Every Beginner Should Know

Baitholder Hooks

If you’re fishing with worms, chances are you’ll end up using a baitholder hook. These hooks have small barbs along the shank that help keep soft baits from sliding down and covering the point. Whether you’re targeting bluegill, perch, trout, or small catfish, a baitholder hook is one of the most versatile options you can carry. For many beginners, a size 6 baitholder hook is a perfect starting point.

Circle Hooks

In a traditional hook design, the point faces the opposite direction to the shank. In a circle hook, the point faces the shank, often at a 90-degree angle. This dramatically reduces deep hooking and improves fish survival after release. That’s why circle hooks have become the preferred option in many conservation-minded fisheries, and in some instances the fishing regulations dictate their use, and no other hook type. But even where you have other options, if catch-and-release fishing is important to you, circle hooks deserve a spot in your tackle box.

How do they work? Unlike traditional J-hooks, the point of a circle hook curves inward toward the shank. As you reel down and apply steady pressure, the hook naturally rotates into the corner of the fish’s mouth. Setting a circle hook too aggressively is a typical rookie mistake. Keep it cool and let the design do the work.

Aberdeen Hooks

Aberdeen is a port city in Scotland, famous among other things for its fishing heritage. The hooks named after the city hooks feature a long shank and light wire construction. They’re popular when fishing with live minnows because the thin wire causes less damage to the bait, helping it stay lively longer.

They also have an unexpected advantage around brush and submerged timber. Because the wire is relatively light, an Aberdeen hook will often bend rather than break when snagged, allowing you to retrieve both the hook and the rest of your rig.

Treble Hooks

Treble hooks are the three-pointed hooks you’ll find attached to many spinning lures, including crankbaits, spoons, and topwater plugs. Their multiple points increase your chances of connecting with fish that strike aggressively or swipe at a moving lure. The tradeoff is that they can be harder to remove and much easier to stick into your hand if you’re not careful. For beginners, a pair of long-nose pliers is almost mandatory when dealing with treble hooks.

Final Thoughts

Hooks may not be the most exciting fishing purchase, but they’re often the difference between getting bites and catching fish. The good news is that you don’t need dozens of styles and sizes. Learn a few versatile hook types, and match your hook to your bait rather than the fish you’re dreaming of catching. Master those fundamentals, and you’ll spend less time staring at tackle walls and more time doing what really matters: fishing.

Next in ‘Fishing 101’

Fishing 101: Essential Knowledge for Fall Freshwater Fishing

In some countries, autumn comes on September 1, in others, on the day of the Autumnal Equinox, September 22/23. Whatever the date, fall is already upon us. And along with the usual poetry about leaves turning red and yellow, clear skies and waters, crisp mornings and so on, the angling experience changes, too.

Autumn is arguably the most misunderstood season in freshwater fishing. It isn’t one long feeding frenzy — it’s three very different seasons stacked on top of each other, each with its own water chemistry, its own fish behavior, and its own tactics. This guide breaks down the three faces of autumn, explains how cold water makes a difference, answers five questions about fishing in autumn that most beginning anglers have, and gives the essential safety tips. CONTINUE READING