A small incision is seen in the underside of a North American green sturgeon after fish biologists from the U.S. Army Corps of Engineers Sacramento District inserted a PIT (Passive Integrated Transponder) and an acoustic tag before closing the cut with dissolvable sutures. The tagging was done as part of USACE’s yearslong effort to gather behavioral data of the threatened species that migrate through the Sacramento River every three to five years. The data is then analyzed to determine the degree of impacts USACE civil works projects may or may not have on the species. USACE fisheries biologists have inserted telemetric tags in 85 green sturgeons over the past four years and plan to tag about another hundred fish over the next four years. (U.S. Army photo by Ken Wright)