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

> > Dry Conditions and Mayfly/Caddis Hatches

CharlieSawdMay 22nd, 2009, 4:33 pm
St. Michael, Minnesota

Posts: 26
I am curious if any of you have come across any literature, or know personally why dry conditions (low precipitation and stream level) affect mayfly and caddis hatches. At first, the answer may seem intuitive, but upon further scrutiny, I am finding that is not the case.

Any help would be appreciated.

Charlie Sawdey
WillmilneMay 22nd, 2009, 4:57 pm
Manitoba Canada

Posts: 19

This paper dicusses diversity and densities in an unstable stream environment[

and this one has some interesting data regarding flow variations and emergence densities

hope that helps


KonchuMay 22nd, 2009, 6:38 pm
Site Editor

Posts: 503
That IS a deceptively difficult question to answer. Here's a few thoughts and observations. No more than that.

Several local insect species develop much more quickly when the water levels drop and flow slows. One part of this is that the stream temperature increases and so does the metabolism of the bugs.

In a nearby stream that I visited about an hour ago, for example, the insects are developing pretty quickly now. We had near flood conditions about a week ago, but the stream has dried to a mere trickle this weekend. The populations of bugs are really concentrated, and I'm guessing they'll pop out any day, if they haven't already started.

I saw some fish rising and kissing the water's surface. I heard even more of this from nearby pools.

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
Name basis.....
In Maccaffertium ithaca Mayfly Nymph by Quillgordon
Re: Flies getting smaller
In General Discussion by GoofusBug
7Jan 3, 2009
by Martinlf
Re: Wolf River
In General Discussion by John
2Apr 16, 2008
by Bflat
Re: Help what is this
In the Identify This! Board by Xavier_Carp
9Aug 10, 2007
by Konchu
Re: Hecuba
In General Discussion by Sayfu
12Aug 14, 2012
by Sayfu
Re: Where To Find Trico Nymphs
In the Mayfly Genus Tricorythodes by Lastchance
3Jul 10, 2011
by Entoman
Re: Edwards Run
In General Discussion by Crozetian
1Feb 11, 2020
by Wbranch
Re: Take Lessons or Just Wing It?
In General Discussion by EatStayPlay
12Jun 27, 2010
by Jmd123
Re: yellowish possibly night hatching mayfly
In the Identify This! Board by Aafloyd
20Nov 1, 2011
by Jmd123
Re: Lepto question
In the Mayfly Family Leptophlebiidae by JasonM
1Mar 7, 2010
by Taxon
Most Recent Posts
Re: The South Holsten River
In Fishing Reports by Martinlf
Re: Tellico Nymph
In Fly Tying by Coha (Wbranch replied)
Michigan's Ausable River System
In General Discussion by Oxbow
Re: Trico Spinner, as requested
In the Identify This! Board by Gutcutter (Wiflyfisher replied)
Re: Trico nymphs and emergers
In the Mayfly Genus Tricorythodes by Steamntrout (Martinlf replied)
Re: Holy Grail Caddis pupa
In Fly Tying by Coha (Wbranch replied)
Re: Centroptilum
In the Identify This! Board by Wbranch (Konchu replied)
Re: Jonathon's moving again...
In General Discussion by Jmd123 (Martinlf replied)
Re: Bald-Tailed Baetidae
In General Discussion by Dickybird (Konchu replied)
Re: 2 insect wing vein questions, and 1 on etymology
In General Discussion by Dickybird (Troutnut replied)