Merkin Crab
Del Brown's Merkin crab is the fly that made permit catchable on purpose - a yarn-bodied crab that dives for the bottom exactly like the real thing surrendering.
Permit drove fly fishers to despair until Del Brown's Merkin: strands of tan yarn splayed flat with rubber legs and lead eyes, a fly whose genius is the DIVE - stripped once, it planes straight for the bottom like a crab bolting for cover, the single motion that flips a trailing permit's switch. Brown caught 513 on it; everyone since owes him.
What it imitates
A small swimming crab bailing for the bottom - the flats' universal panic response, rendered in yarn.
When & where it wins
Permit flats (the reason it exists), plus redfish, bones on crab beds, triggers, even tailing carp inland - crabs are cosmopolitan.
How to fish it
Lead the fish, ONE long strip to announce, then LET IT FALL - the dive is the eat; a tap, a tightening, strip-strike. Resist all extra motion.
Sizes & variants
1/0-6 tan/olive/brown by bottom; modern kin (EP crabs, Flexo crabs) refine the recipe; eye weight = depth again.
Tying notes
Yarn strands cinched crosswise then trimmed to disc - odd to tie, distinctive forever.
Common mistakes
Stripping while the permit inspects (the fall feeds, motion warns), under-leading nervous fish, and taking refusals personally - it's permit; even Del Brown got refused daily.