How to fish for daytime sea trout on the amazing Welsh Dee

Synopsis

Daytime sea trout fishing on the Welsh Dee is often overlooked, yet it can provide outstanding sport when approached correctly. This guide explains when to target sea trout during daylight hours, the river conditions that produce the best results, the tackle and fly patterns that consistently catch fish, and the types of water where sea trout are most likely to hold.

Whether you’re new to sea trout fishing or looking to improve your success on the Welsh Dee and other freestone rivers, these proven tactics will help you fish with greater confidence.

Introduction

Many anglers associate sea trout exclusively with night fishing, but that isn’t the only way to catch them. On many rivers, sea trout can be successfully targeted during the day, particularly in the right weather and water conditions. This is particular helpful if you’re not comfortable with fishing at night

Over many seasons of fishing this remarkable river, I’ve discovered that careful presentation, stealth, and understanding where fish lie can produce excellent daytime catches. In this guide, I’ll share the methods, tackle setups, flies and locations that have consistently worked for me, helping you make the most of the relatively short but exciting sea trout season.

I bet once you’ve experienced the exhilaration of catching a sea trout it will be hard…

to resist becoming addicted to fishing for sea trout.

The prime sea trout fishing on the Welsh Dee is short, from July to the middle of September. So, every year during this period, I focus on fly fishing for sea trout at Llangollen.

The Welsh Dee has an estimated annual run of 10,000 sea trout, with an average size of about 1-2 lbs. In addition, it’s not uncommon to land large sea trout (4 – 8 lbs) and occasionally a double-figure specimen.

Therefore, it’s surprising that I often have the Welsh Dee at Llangollen…

to myself when fishing for sea trout.

Maybe because it seems difficult to fish the Welsh Dee at night, or busy lifestyles do not lend themselves to night fishing.

However, it is possible to start your sea trout fly fishing journey during daylight hours and have some great fishing in the process.

This article provides information to encourage a few more anglers to try fly fishing for Welsh Dee sea trout.

Here’s how…

Daytime sea trout – how to catch them:

Almost every year, on the Welsh Dee, the signal for the main run of the sea trout happens in June.

It usually comes out of the blue while fishing for grayling and trout with either dry flies, wet flies, spiders or nymphs on a light leader (ca. 3lb).

Last, I caught my first sea trout (ca. 2lb) of the season while nymphing for trout at 5 pm during June. I cast a size 16 gold ribbed hare’s ear in front of a large boulder and as the fly swung around…

A sea trout smashed the fly and took off downriver.

Then, later the same day, I caught another sea trout nymphing a fast run further downriver.

From then to the end of September, you have a great opportunity to catch daytime sea trout when the conditions are favourable.

On sunny days, it is best to focus your daytime sea trout fly fishing during the first couple of hours of daylight and the last 3 hours of daylight. With dull, overcast days offering you the best chances of catching daytime sea trout.

What Fly fishing tackle is required for daytime sea trout?

It depends on the river conditions.

When the river is running clear and close to its summer level, the fishing tackle I use for daytime sea trout is the same as I use for grayling or brown trout fishing, i.e.

• 9ft or 9ft 6” rod, 5 or 6wt
• Floating line
• 7ft, 6X tapered copolymer leader tipped with 6ft of 3lb copolymer
• 3 droppers spaced 3ft apart

If the river is running off after a summer spate and coloured, there is a chance of larger daytime sea trout. Therefore, I will use a set-up with a bit more beef to handle a bigger sea trout:

• 10ft 6wt rod
• Floating or intermediate line
• 7ft, 2X tapered fluorocarbon leader tipped with 4ft of 6 to 8lb fluorocarbon
• 2 droppers spaced 4ft apart

What daytime sea trout flies to use?

When the river is running clear at its summer level:

For many years now, my preferred daytime sea trout flies is a team of wet flies: a March Brown spider on the point, a black hopper middle dropper, and a brown & silver sedge top dropper (sizes 14 or 12).

March Brown Spider

• Hook – Kamasan B170 size 14 & 12
• Thread – rusty red UNI 8/0
• Body – Hare’s ears fibres of varying length & colour
• Rib – medium oval gold tinsel
• Hackle – brown partridge neck

Tying Instructions

Black Hopper

• Hook – Kamasan B170 size 14 & 12
• Thread – black UNI 8/0
• Body – black seal’s fur substitute
• Rib – Uni Pearl Mylar #14 (1/32)
• Legs – knotted pheasant tail dyed black
• Hackle – Black Hen

Tying Instructions

Brown & Silver Sedge

• Hook – Kamasan B170 size 14 & 12
• Thread – black UNI 8/0
• Body rear – medium silver tinsel
• Body front – Peacock Herl
• Rib – fine oval silver tinsel
• Hackle – Brown cock

Having read the article on “bling” spiders in Flyfishing and Flytying by Neil Darling (March 2018 Ed.) I have been testing some of these patterns. So far, I’ve had some sea trout success with a couple but it’s still very much a work in progress.

Red Bling Spider

• Hook – Kamasan B170 size 12 & 10
• Thread – red UNI 8/0
• Body – holographic red
• Rib – fine silver wire
• Hackle – Grouse neck
• Cheeks – split jungle cock

Grouse & Olive Bling Spider

• Hook – Kamasan B170 size 12 & 10
• Thread – fluoro-green
• Body – holographic chartreuse
• Thorax – green Hends Spectra dubbing code 89
• Hackle – Grouse neck

Grouse & Blue Bling Spider

• Hook – Kamasan B170 size 12 & 10
• Thread – fluoro-orange
• Body – holographic blue
• Thorax – purple Hends Spectra dubbing code 411
• Hackle – Grouse neck

It is also possible to catch sea trout while tight line nymphing and the following video highlights this…

When the Welsh Dee is running off after a summer spate and is still coloured:

If the river is coloured, I find that small salmon flies work quite well for sea trout. For example, size 12 to 10 doubles…

• Silver Stoat’s Tail,
• Stoats Tail,
• Curry’s Red Shrimp

Where to fish for daytime sea trout at Llangollen

I’ve not had much luck trying to spot sea trout on the Welsh Dee, unless they are jumping in the evening. Therefore, my approach is to find likely lies that offer shelter and fish them. 

River features that provide good sea trout lies include:

• Undercut riverbanks
• Overhanging tree-lined banks
• Weed beds and underwater obstacles
• Boulder-strewn fast water channels

You need to approach likely lies with stealth because sea trout, like sizeable brown trout, are easy to spook.

If possible, avoid wading into the river. However, I’ve found that to reach some of the lies, it is necessary to wade, and if this is done carefully, you can still catch sea trout.

Over many years, I’ve built up knowledge of where sea trout usually lie and can be caught during daylight on the Welsh Dee at Llangollen; these include:

• Top Pool (tail)
• Dee Farm (head)
• Hollybush Pool (tail)
• Duncan’s Pool
• Horseshoe Falls (top section)
• Mill Run (far bank)

If you fish the above places either early morning or evening, you will eventually catch a daytime sea trout. Note – if you don’t catch a sea trout within 15 minutes of fishing in one spot, move on to the next place.

Key Takeaways for Daytime Sea Trout fishing

• Daytime sea trout fishing on the Welsh Dee is most productive from July through to mid-September.
• Early mornings, late evenings and overcast days offer the best chances of success.
• In clear summer water, standard trout or grayling tackle is usually sufficient, while coloured water after a spate calls for stronger tackle and leaders.
• Traditional wet flies, spiders and small nymphs consistently catch daytime sea trout, with small salmon flies becoming effective when the river carries colour.
• Focus on likely holding areas such as undercut banks, boulders, weed beds and fast channels, and fish each spot methodically before moving on.
• Above all, stealth and mobility are essential—approach each lie carefully, avoid unnecessary wading, and keep searching until you locate active fish.

Conclusion

While sea trout are often regarded as a species best pursued after dark, the Welsh Dee regularly proves that productive fishing can also be enjoyed during daylight hours. Success comes from understanding the river conditions, approaching each pool with care, and adapting your tackle and fly selection to suit the water and the fish’s behaviour.

Patience, observation and mobility are just as important as casting ability. By focusing on likely holding areas, fishing methodically and making the most of favourable conditions, you’ll greatly increase your chances of connecting with one of the Dee’s hard-fighting sea trout.

Whether you’re trying daytime sea trout fishing for the first time or refining techniques you’ve used for years, every session on the river offers an opportunity to learn something new. With the right preparation and a willingness to adapt, the Welsh Dee can provide some truly memorable fishing throughout the summer season.

If you are interested in fly fishing for sea trout on the Welsh Dee, there are some excellent Day Ticket options 

Good Luck and…

Please contact me if you have any questions. Also, take a look at part 2 covering how to approach night-time fishing for sea trout fishing.