May 31st, 2004|
Q. I had the good fortune to visit Colorado last summer, and a chance to fish the Frying Pan River. I experienced big caddis, green drake, and other mayfly hatches at high noon in the blazing sun with air temperatures over ninety degrees! Almost all of the hatches this size I've experienced in N. California were caddis just about the time it's too hard to see to tie a knot. I also fish tailwaters here where most trout are reluctant to come to the surface, even during a relatively good hatch. What causes these differences? Thanks.
If you've read any of my previous responses concerning
insect hatching and temperature, you'll know that
aquatic insects require a certain number of
degree-days to hatch; when they have experienced
the required number, they hatch, regardless of
whether it is high noon, evening, hot, or cool.
Some insects respond to various light conditions
and emerge more readily when the preferred light
conditions are present; that might explain why
the caddis in N. California emerge under low
light conditions. Again, many of these traits
are species-specific, so it is hard to generalize
on some of these things. The reluctant trout may
find plenty to feed on in the deeper waters, thus
they don't have any reason to chase hatches - that's
~ C. E. (Bert) Cushing, aka Streamdoctor
105 W. Cherokee Dr.
Estes Park, CO 80517
The 'Stream Doctor' is a retired professional stream ecologist and author, now living in the West and spending way too much time fly-fishing. You are invited to submit questions relating to anything stream related directly to him for use in this Q & A Feature at email@example.com.
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