I worked for DDOE for 2 years doing electroshocking and invert sampling on the DC streams (3 sections of rock creek, battery kemble, pope's branch, dalecarlia, watts branch, hickey run, etc.) and we commonly got aquatic worms, chrionomids, crane fly larvae, damselfly larvae, giant water bugs (belostomatids), and literally only 1-2 mayfly larvae that I can recall.
I know that the EPT = good water quality is a generalization since many species in those 3 orders are pretty tolerant. The stone flies are usually called shredders right? Or is that another group? If I recall, there are 1 or more stonefly species that are predatory! It's good to see that we do actually have some of those guys around here.
Surprisingly, I don't recall ever kicking up a helgrammite -- but I know a lot of you have. I'd love to kick one up some time.....I've always thought being bitten by a helgrammite would be interesting. Those giant water bugs can apparently bite the crap out of you....like assassin bugs.
Gene
On Wednesday, January 30, 2013 9:38:16 AM UTC-5, Carl wrote:
-- On Wednesday, January 30, 2013 9:38:16 AM UTC-5, Carl wrote:
On 01/29/2013 07:48 PM, TurbineBlade wrote:
Oh that's cool! I didn't know we had ANY EPT around here (ephemeropters. plecopters....and trichopters!)We have lots of all of these. During the summer, I see large quantities of all three of these swarming parking
lot lights near a stream( that has water in it all year long). I am not sure how many actually live in the potomac.
I also see the occasional fishfly (helgramite adult). They are scarry looking beasts.
The water quality monitoring programs in Maryland (a number of organizations participate) do macro-invertebrate surveys in local streams. Mayflies and stonefiles are an indicator of a healthy stream. If all you find are diptera(fly) larva, the stream is less healthy.
Carl
I've never seen a stonefly nymph in any DC streams...and only 1-2 mayflies. Thank you for posting this! That's extremely cool.
Gene--
On Tuesday, January 29, 2013 7:24:30 PM UTC-5, Brendan wrote:stonefly... good to see!
even with the adults popping on warm days i still fish an emerger/nymph pattern unless you see fish rising.
On Tuesday, January 29, 2013 7:18:44 PM UTC-5, Aden wrote:
I am no entomologist so I wonder if anyone can identify this? There were thousands coming off the water at Great Falls today in the warm sun.
http://www.tpfr.org
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