Insect life in the substrate is not only of particular interest to anglers, but is a singularly important indicator of overall health of the ecosystem.  Dave provided a review of the published research on macroinvertebrates in the river then suggested both location, frequency and method for a comprehensive sampling plan.  There was also interesting discussion of the possibility of supplementing this research with hatch data. See Bighorn Benthic Macroinvertebrate Literature Review and Sampling Plan Here.