Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > Cahills hatching characteristics and swimming ability

The Specimen

The Discussion

ChadwickJuly 1st, 2009, 4:19 pm
Posts: 1I would like to know the best way to present the nymph and in which section of the river. Should they be dead drifted mid riffle, swung through tail out ect.
GONZOJuly 2nd, 2009, 3:12 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Hi Chadwick,

Although heptageniids can swim, they generally do it out of the current. If you were to rate the swimming ability of mayfly nymphs, Isonychia would be Michael Phelps, and most heptageniids would be something like the fat kid in remedial gym class. When you watch heptageniids like Stenacron, Maccaffertium, or Stenonema in aquaria, they often try to cling to airstones or, in the absence of stones or other debris, to each other. However, when they get caught in the turbulence created by the airstone without first getting a good grip, they usually freeze and drift in a kitelike manner until they are free of the current. Then they might swim around awkwardly until they regain a foothold on something.

So, clinger nymph imitations presented in stronger current should usually be dead-drifted with at most an occasional feeble twitch. A gentle twitching lift or swing would be imitative as the nymph moves into emergence sites near edges, eddies, or slack areas around boulders.

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: Heptageniidae ID request
In the Identify This! Board by Willmilne
6Nov 15, 2008
Re: North Central PA
In the Identify This! Board by Gutcutter
22May 9, 2012
by Entoman
Re: Heeeeere, Fluffy!
In Fly Tying by FisherOfMen
15Jan 28, 2012
Re: Wiggle Nymphs
In General Discussion by Martinlf
2Apr 28, 2007
by Martinlf
Re: Unidentified Baetidae
(2 more)

In the Identify This! Board by Benthosfan
8May 5, 2021
by Benthosfan
Re: Need ID help please
In the Identify This! Board by Gastriper
20Jan 13, 2015
by Taxon
Re: Mayfly I.D.
In the Identify This! Board by 14Adams
6Jun 3, 2011
by Brookyman
Re: Assorted Nymphs From The Russian River
(1 more)

In the Identify This! Board by Millcreek
6Jun 4, 2016
by Creno
Re: Black flies--bane and boon
In the True Fly Family Simuliidae by GONZO
37Jul 13, 2011
by Jmd123
Re: Today's picture on the top of the screen - BRRRRRR!!!!
In General Discussion by Jmd123
24Sep 27, 2011
by Jmd123
Most Recent Posts
Re: Rod and reel suggestion?
In Gear Talk by 87North (Erallommakr replied)