Dr. Charles Randklev, Research Scientist and Principal Investigator with the Texas A&M Natural Resources Institute, and Amanda Goldsmith, M.S. Student with the Texas A&M University Department of Wildlife and Fisheries Sciences, assemble a mussel silo filled with juvenile Texas fatmucket mussels. The researchers are studying how the extreme low and high flows that plague the San Saba River impact populations of rare mussel species. (Photo: Aubry Buzek/USFWS)