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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Berks Co. PA

Posts: 2
Nymphnut on Jan 4, 2008January 4th, 2008, 12:21 am EST
Hi.... I'm new to this Forum. Next month my Trout Unlimited Chapter is going to have a discussion on global warming and its effects on trout. Now, I dont want to start any big argument on who or what is causing global warming. BUT, my question is- Does anyone know and have Proof that global warming has already caused harm to any natural trout stream anywhere here in North Eastern USA ? And if so, how has it effected that stream ? Were is and whats the name of that stream ?
Thanks for the help .. Bob
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Jan 4, 2008January 4th, 2008, 4:40 am EST

This is not intended as a statement either supporting or debunking global warning. However, it seems to me that global warming would be virtually impossible to demonstrate on an individual stream basis.

Just for the purpose of discussion, let us pretend that the average stream temperature for all streams in the US increased by .1 degrees from 2006 to 2007. And let us further pretend that the average temperature for your favorite local stream decreased by 2 degrees from 2006 to 2007. Does this mean that your favorite local stream was immune from the effects of global warming? This may not be particularly well stated, but you probably understand what I'm trying to say.
Best regards,
Roger Rohrbeck
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Jan 4, 2008January 4th, 2008, 2:50 pm EST
Yes, I'd suspect that there are too many variables that affect stream temperature to account for all of them. For example, a rainy spring could lead to increased plant growth, a more dense canopy, and cooler water temperatures, even if the overall air and ground temperature had increased.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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