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VOLUME 21 <br />Age and Growth of San Pedro Martir Rainbow Trout, Oncorhynchus mykiss <br />nelsoni Evermann, from Arroyo San Rafael, Baja California, Mexico 141 <br />Gorgonio Ruiz-Campos <br />Javier Gomez-Ramirez <br />Radiotelemetry of Razorback Suckers in the Gila River, Eastern Arizona 163 <br />Paul C. Marsh <br />W.L. Minckley <br />The Rapid Spread of the Freshwater Hydrobiid Snail Potamopyr.Q?us <br />antipodarum (Gray) in the Middle Snake River, Southern Idaho 173 <br />Peter A. Bowler <br />On-going Macroninvertebrate Analysis Using the Biotic Condition Index and <br />the Appearance of Potamopyrgus antipodarum (Gray) in Box Canyon Creek, <br />Southern Idaho 183 <br />Stephen Langenstein <br />Peter Bowler <br />The Current Status of the Bruneau Hot Springs Snail, an Undescribed <br />Monotypic Genus of Freshwater Hydrobiid Snail, and its Declining Habitat 195 <br />Peter A. Bowler <br />Pat Olmstead <br />Habitat Monitoring and Management Implications at Ash Springs and <br />Condor Canyon, Nevada, for the White River Springfish and Big Spring <br />Spinedace 213 <br />Edward Guerrero <br />Present Status and Conservation Efforts for the Hiko White River Springfish <br />(Crenichthys baileyi rg andis) 217 <br />Jon C. Sjoberg <br />Michael D. Sevon <br />Protecting Natural Ecosystems: The Status of the San Marcos River <br />Threatened and Endangered Species 219 <br />Robert J. Edwards <br />Fishes of North America Endangered, Threatened, or of Special Concern: <br />1989 221 <br />James E. Johnson