Corixa Cruncher

Corixa Cruncher

 

corixaSince I first discovered Madeira metallic threads, this pearl thread has become a staple for corixa patterns. This is a more suggestive pattern than other corixa patterns, but it is quick to tie in a range of sizes. Imitating the Corixa Punctata or lesser water boatman, these wonderful insects breath oxygen by trapping it beneath their wing cases – the pearl colour of the Madeira thread suggests this trapped bubble of air perfectly in this pattern. Technically, Corixa don’t have tails, but the tail here accentuates the overall shape of the insect which tapers markedly towards its rear.

Hook: Tiemco 3769 #10-14
Tail: Brown rooster hackle fibres
Back: Hen pheasant
Rib: Silver wire
Body: Madeira metallic Col. 300
Hackle: Brown rooster
Thread: Uni 8/0 white, switched for brown for head

Tarcher style nymph

Tarcher style nymph

Hook: Daiichi 1870 #14
Tail: Pheasant tail dyed black
Rib: Chartreuse ultrawire, brassie
Body: Pheasant tail dyed black
Wing case: Pheasant tail dyed black
Thorax: Peacock here dyed black
Legs: Pheasant tail dyed black
Thread: Danville 6/0 black

ig190128-174845-editI first came across this pattern in John Gierach’s book Good Flies in which he recounts its invention by Ken Iwamasa and first published in his 1988 book Iwamasa Flies.

The original was designed as a copy of mayfly nymphs which would arch their abdomens when dislodged from the bottom. Today, there are many variants on the pattern tied because it looks so life like (to the angler at least, who knows what the trout thinks). Tied in a 2X heavy Daiichi 1870, it’s an effective pattern near weed beds on reservoirs, the inverted hook reducing snagging.