Grayling on the Kennet and Dun feed on when the trout have gone quiet. They rise from the bottom, take, and turn straight back down — strike on what you see and you'll miss every time. They never jump. They fight deep, dorsal fin turned broadside to the current, and they lose with the same dignity they win with.
Delayed strike. Count one, then lift. Anything quicker and the fish is gone.
The Lady of the Kennet and Dun
Grayling are not trout. That sail-like dorsal fin, the silver flanks shot through with purple in low light, the faint scent of thyme that gives them their Latin name, Thymallus. They fight deep and boring, dorsal fin turned broadside to the current, and they never jump. They feed differently too — rising from the bottom to intercept food vertically, with an inferior mouth that demands a different approach from the angler.
On the Kennet and Dun they are most catchable from autumn into early winter, when the water is clear, the trout have gone quiet, and pods of fish hold in the glides. Grayling fishing closes on the Fishery at the end of December, and there is no fishing of any kind on the Fishery from January until the season reopens on 1st May — so treat November and early December as the window, not a consolation prize tacked onto the trout season.
How Grayling Feed: Not Like Trout
They rise from the bottom to intercept food vertically. They shoal and compete.
A trout spots a nymph at its level and intercepts sideways. A grayling rises from the bottom — sometimes three or four feet — to intercept food drifting overhead, so it can look like a surface feeder while actually taking food well down in the water.
They shoal and compete: where you catch one, there are usually more. Heavy wading or clumsy casting spooks the whole pod, but they will return to the same lie within fifteen to twenty minutes if left alone.
Their inferior mouth also changes the take. A grayling rises to a dry fly, takes it, and turns straight back down — by the time you see the rise the fish is already heading for the bottom. Strike on the rise, as trout instinct demands, and you pull the fly away. The delayed strike — count "one", then lift — is the cardinal rule.
Nymph and the Induced Take
Sawyer's induced take on sighted fish; a French leader through the glides when nothing is showing.
Frank Sawyer developed the induced take on the Hampshire Avon for exactly this kind of chalk stream grayling. A weighted nymph — Sawyer's Pheasant Tail or a Killer Bug — is cast upstream of a sighted fish and allowed to sink ahead of it. As the nymph nears the grayling, lift the rod tip gently; the nymph rises in the current like a hatching pupa, and the grayling intercepts it on the way up. A nine-foot four or five weight, twelve-to-fourteen-foot leader to five-X or six-X, single weighted nymph. You need to see the fish, or at least its lie.
Where fish aren't showing, a long, fine leader through the glides covers water efficiently: an eleven-foot three-weight, an eighteen-to-twenty-two-foot tapered leader with a sighter section, wire-weighted nymphs (no beads — the Fishery bans goldheads) on sizes fourteen to eighteen. Track the sighter through the drift — a pause or slight deviation is a take. Lift promptly, not violently.
Dry Fly: The Delayed Strike
Overcast, mild, a steady hatch of small olives, pods of fish rising in every glide. Count "one" before you lift.
On the Fishery, nymph fishing is only permitted from 1st July — before that it's upstream dry fly only, and the same rule applies to grayling. In practice this means the autumn grayling window (once trout close and before the December grayling close) is fished dry-fly-first anyway: overcast, mild afternoons with a steady hatch of small olives are what you're hoping for.
Key dries: Red Tag on a fourteen to sixteen — the classic grayling pattern — plus CdC Olive and small Klinkhamer on a sixteen to eighteen. Dead drift, upstream or across-and-upstream. Grayling are less leader-shy than the Fishery's chalk stream trout, but drag kills the take just as fast.
Tackle for Grayling
A four-weight for dry fly and the induced take. Barbless hooks always — their mouths are soft.
Nine-foot four-weight with a softer action that protects light tippets on the strike, floating line, twelve-to-fourteen-foot leader tapered to five-X or six-X. For nymph work from July, a longer, lighter leader with a sighter section serves both trout and grayling.
Barbless or micro-barb hooks are required for grayling once the trout season closes. Use a landing net with fine, knotless mesh, and neoprene gloves once the water turns cold — numb fingers cost fish on the knot, not the cast.
Conservation: The Lady Deserves Care
Selective, catch-and-release fishing keeps the Kennet and Dun grayling population healthy.
Fish for grayling selectively — target shoals rather than fishing on regardless, and only in clear water. Catch and release always: barbless hooks, wet hands, minimal handling, and a proper revive before letting the fish go.
Grayling spawn in spring, which is one reason the Fishery closes entirely from January until 1st May — leaving the fish undisturbed well ahead of spawning.