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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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
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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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