Randyflycaster 0 Report post Posted May 11, 2014 If not, do any of these hatch quickly? (I'm preparing an eastern hatch chart.) Ephemerella: subvaria, dorothea, invaria, guttulata. Thanks, Randy Quote Share this post Link to post Share on other sites
mikechell 0 Report post Posted May 11, 2014 Are you asking about time from egg to adult ... or time from hitting the surface to breaking out of the shuck? Quote Share this post Link to post Share on other sites
utyer 0 Report post Posted May 11, 2014 Or maybe the time from the beginning of the emergence of a given species to the end of that emergence. A population of subvaria will take two or three weeks to emerge once they have started. Many other species will have a more compressed time frame, and some will have a longer time frame. In different locations, these hatches (same species,) will take place earlier or later depending on latitude, elevation, and other climate factors. A few species will hatch over a span of months rather than weeks. Most individual insects that hatch in mid stream, will do so rather quickly. Some genera like Isonychia crawl out of the water on rock (like stone flies,) Quote Share this post Link to post Share on other sites
mikechell 0 Report post Posted May 11, 2014 Or maybe the time from the beginning of the emergence of a given species to the end of that emergence. OH ... total time from the first bug to hatch to the last bug to hatch ... got it. Quote Share this post Link to post Share on other sites
Randyflycaster 0 Report post Posted May 11, 2014 I mean from hitting the surface and breaking out their shucks. I remember reading somewhere that Ephemerellidae nymphs hatch laboriously. Randy Quote Share this post Link to post Share on other sites
rockworm 0 Report post Posted May 11, 2014 This depends mainly upon the temperature of the water and air. And when its cold the newly emerged dun may float some distance before taking to the air. Quote Share this post Link to post Share on other sites