How to choose the right fly hook? Fly hook sizes and hook types explained
Choosing the right hook is one of the most important elements when tying flies. The hook’s shape, shank length and wire thickness influence not only the appearance of the fly but also how it behaves in the water and how effectively the fish is hooked.
Many beginner fly tyers focus mainly on materials such as feathers, dubbing or other synthetic fibres, treating the hook only as a structural base. In reality, the hook determines the proportions of the fly and largely decides whether the finished pattern will be balanced and effective.
The topic of choosing hooks comes up very often because the same hook size does not necessarily mean that a particular model will be suitable for every fly. A different hook is used for dry flies, another for nymphs and yet another for streamers.
In this guide I will show what to look for when selecting a fly hook and why choosing the correct model matters already at the stage of planning the fly pattern.
In this guide:
- What determines hook selection in practice?
- How to read fly tying hook designations?
- Fly hook sizes – why do the numbers work in reverse?
- The most common mistake when choosing a hook
- When to choose barbed or barbless hooks?
- Why should the type of fly determine the hook choice?
- When is it worth doing things differently?
What determines hook selection in practice?
The choice of hook mainly depends on the type of fly you want to tie. Different shapes and proportions are suitable for dry flies, nymphs or streamers.
One of the most important parameters is the shank length. For dry flies and wet flies, hooks with a straight shank and standard length are most commonly used. This shape allows you to tie most classic patterns imitating mayflies or caddis.
Wire thickness is also very important. Dry flies usually require hooks made from thinner wire because they are lighter and help the fly stay on the surface. In nymphs, wet flies and streamers, thicker wire hooks work better because they help the fly sink faster and withstand additional weight and stronger fish.
The hook profile is equally important. Straight, curved scud hooks or jig hooks are not only visually different. Each profile affects how the fly is tied and how it sits in the water.
The bend size and eye orientation also matter. These small details can influence the type of pattern you can tie and how securely the hook holds the fish during the fight.
How to read fly tying hook designations?
On fly hook packaging you will often find abbreviations or English descriptions that are not always clear for beginners. Understanding them makes it easier to quickly recognise the hook type, shank length, wire thickness and other design features.
Below are some of the most common fly hook designations and their practical meaning.
| Designation | Description |
|---|---|
| Hook type | |
| Dry | Hooks designed for tying dry flies. |
| Wet | Hooks used for wet flies. |
| Nymph | Hooks designed for tying nymph patterns. |
| Scud / Czech Nymph / Shrimp | Curved hooks often used for scuds or Czech nymph patterns. |
| Emerger / Caddis pupa / Swimming nymph | Hooks commonly used for emerger patterns. |
| Streamer | Hooks designed for tying streamers. |
| Salmon | Salmon hooks used for salmon and sea trout flies. |
| Saltwater | Hooks designed for saltwater flies. |
Shank length | |
| EX | Extra short shank hook. |
| STD | Standard shank length. |
| XL, 2XL, 3XL... | Hooks with extended shanks. |
Wire thickness | |
| XF | Extra fine wire. |
| STD | Standard wire thickness. |
| XH | Extra heavy wire. |
Other designations | |
| Down eye | Hook eye angled downwards. |
| Straight eye | Eye aligned with the hook shank. |
| Up eye | Hook eye angled upwards. |
| Barbed | Hook with a barb. |
| Barbless | Barbless hook. |
| Forged | Forged hook – flattened wire that increases strength. |
| Long needle | Extended hook point. |
Fly hook sizes – why do the numbers work in reverse?
One of the things that often surprises beginner fly tyers is the hook size system. Unlike many other numbering systems, the larger the number, the smaller the hook.
- 20 – very small hook
- 10 – small hook
- 4 – medium hook
- 1/0 – large hook
- 5/0 – very large hook
After size 1, the numbering changes to the “/0” system. The larger the number before /0, the larger the hook.
The most common mistake when choosing a hook
The most common mistake beginners make is trying to tie different fly patterns on the same hook model. This often leads to incorrect proportions and reduced effectiveness of the fly.
When to choose barbed or barbless hooks?
Barbed hooks are still widely used, but more and more anglers prefer barbless hooks because they make releasing fish easier and reduce damage to the fish’s mouth.
Why should the type of fly determine the hook choice?
The type of fly should usually be the starting point when choosing a hook. Different hook models are used for dry flies, nymphs and streamers.
Frequently asked questions about fly hooks
Is hook size 12 the same for every manufacturer?
Not necessarily. Fly hook sizing is not fully standardised, so a size 12 hook from one brand may be slightly larger or smaller than a size 12 hook from another manufacturer.
What hook sizes are commonly used for dry flies?
Dry flies are most often tied on hooks ranging from size 12 to 20, depending on the insect being imitated.
Do barbless hooks hold fish less securely?
Well-designed barbless hooks can hold fish very effectively. Maintaining constant line tension during the fight is the key factor.
Summary
Choosing the right hook is the foundation of a well-tied fly. If you want to see different models used in fly tying, you can browse fly tying hooks available in the shop.
Best regards
Krystian Niemy