Euro nymphing the Upper Credit: 4 for 8 on a Sunday morning

A couple of free hours at the Forks of the Credit, three flies, and two changes that fixed two different problems: first getting deep enough, then getting small enough.

The Upper Credit around the Forks is fast, rocky pocket water. That geography does most of the thinking for you: the holding lies are short, the current is quick, and a fly has very little time to get down before the drift is over. Everything below follows from that.

The setup

Standard euro nymphing rig — long rod, thin level line, no indicator, leading the flies through the drift with the rod tip rather than mending. The value of the method here is contact: in broken pocket water you often feel a take you'd never see.

Positioning matters more than casting distance. You want to be close enough to hold line off the water and lead the flies at current speed, which usually means fishing much shorter than instinct suggests. Approach from downstream, fish the near seams before wading through them.

Fly one: Hare's Ear, no fish

I started with a Hare's Ear nymph, which is the fly I'd normally reach for anywhere. It's a confidence pattern and it imitates a lot of things reasonably well.

Nothing. Not a touch, in water that looked right.

My read was that the bead was simply too light. It's a soft, buggy fly without much weight, and in this current it was still sinking when the drift ended. When water looks right and produces nothing, depth is the first thing to suspect — a fly the fish never see can't be the wrong fly yet.

Fly two: stonefly, three hook-ups and nothing landed

I switched to a stonefly nymph specifically because it had a tungsten bead. I wanted the extra weight to get the fly a bit deeper, into the band the fish were actually holding in. Stoneflies are also genuinely abundant in this kind of fast, rocky, well-oxygenated water, so the pattern made sense on its own terms.

Three hook-ups across the first two spots — immediate confirmation that depth had been the problem. But none of them stuck.

Thinking about it afterwards, the profile was the issue. The stonefly is a thick, bulky fly, and the Upper Credit here runs very clear. Fish were coming to it and then thinking better of it. That's a different failure from the Hare's Ear: the fly was now in the right place, but the fish were getting a good look at it and not committing.

Fly three: Perdigon, four landed

The Perdigon solved both problems at once. It keeps the heavy tungsten bead — so the depth I'd gained with the stonefly stayed — but the body is slim and coated, a far smaller silhouette in the water.

Four fish landed and another hook-up, all from the second spot. It worked very well.

The sequence is the useful part, more than any individual fly. Two changes, two variables:

• Fix depth first. Until the fly is in front of fish, nothing else you change tells you anything. Weight is the lever, and a tungsten bead is the fastest way to pull it.
• Then fix profile. Once you're getting hook-ups, you know the depth is right, and any remaining problem is what the fly looks like. In clear water that usually means going slimmer, not more realistic.

Hook-ups without hookups landed is a genuinely useful signal, not just bad luck. It tells you the first problem is solved and points you at the second one.

Euro nymphing the Upper Credit — 4 for 8 on small rainbows

• 0:00 Intro
• 0:32 Gear setup & positioning
• 1:25 Spot 1 — Hare’s Ear, no fish
• 1:41 Stonefly — 3 hook-ups
• 3:51 Perdigon — 4 landed
• 8:41 Outro

How to work this water

• Fish the pockets, not the pool. Behind boulders and in the slots between them, the drift is often only a metre or two. Cover a lot of them rather than working one seam repeatedly.
• Start heavy. If in doubt use the heavier fly first. You can always drop weight; you can't recover a drift that never got down.
• Keep the bead, change the body. When you're getting touches but not landing fish, swap to a slimmer fly of the same weight rather than starting over on depth.
• Change after the third fly-less pocket, not after the third hour. The feedback loop here is fast because each drift is short.
• Wade carefully. The gorge is fast and the footing is rock. The fisheries guide for this river warns that fast water warrants extreme caution even in low flow, and that's fair.