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.
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This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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One of the only real benefits I've got from my rearing aquarium so far is that I've had quite a variety of midges emerge, giving me a chance to photograph these fragile little insects which are otherwise really hard to transport in photogenic form. This one recovered from being gassed and flew away before I could photograph it on the ruler, but it was very small, around 1.5mm.
Gatruk
Posts: 1
Posts: 1
Gatruk on Jan 29, 2010January 29th, 2010, 9:19 am EST
I am searching to find effective ways of cultivating chronomidaes, what kind of best cheap an effective medium that I should use , what are there lifecycles . lifespans an their behaviors. Thanks for letting me to join the forum.
Taxon on Jan 29, 2010January 29th, 2010, 3:59 pm EST
Gatruk-
Chironomids (members of true fly family Chironomidae) are a diverse group numbering ~1233 identified North American species, and still counting. They are found in most waters, from sewage treatment ponds to mountain streams, and everything in between. However, attempts to propagate chironomids have been largely unsuccessful, mostly owing to the inability to induce swarming and mating of chironomid adults in captivity. In other words, you can lead them to water, but you can't make them ..... Hmm, bad joke, that. Anyway, for more information, see this article.
Chironomids (members of true fly family Chironomidae) are a diverse group numbering ~1233 identified North American species, and still counting. They are found in most waters, from sewage treatment ponds to mountain streams, and everything in between. However, attempts to propagate chironomids have been largely unsuccessful, mostly owing to the inability to induce swarming and mating of chironomid adults in captivity. In other words, you can lead them to water, but you can't make them ..... Hmm, bad joke, that. Anyway, for more information, see this article.
Martinlf on Jan 30, 2010January 30th, 2010, 8:43 am EST
Just the kind of joke I'd expect from you Roger. ;> But with that one-liner you did leave yourself open, knowing I'd be lurking.
Oh, now I get it; this was a setup. You got your buddy Gatruk to post the chromomidae question, so you could reply, and here I am stepping into the trap.
But, I must admit, I kinda liked the joke.
Oh, now I get it; this was a setup. You got your buddy Gatruk to post the chromomidae question, so you could reply, and here I am stepping into the trap.
But, I must admit, I kinda liked the joke.
"He spread them a yard and a half. 'And every one that got away is this big.'"
--Fred Chappell
--Fred Chappell
Taxon on Jan 30, 2010January 30th, 2010, 12:07 pm EST
Hi Louis-
Wouldn't want to disappoint you.
Best regards,
Wouldn't want to disappoint you.
Best regards,
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