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1979 THE ENDANGERED SPECIES: A SYMPOSIUM 61 Pahrump killifish Empetrichthys latos /atos E 1,4,5 NV Miller Livebearers, family Poecilidae Amistad gambusia Gambusia amistadensis E 1,5 TX Peden 1973 Big Bend gambusia Gambusia gaigei Hubbs E 1,5 TX San Marcos gambusia Gambusia georgei Hubbs E 1,4,5 TX and Peden Clear Creek gambusia Gambusia heterochir Hubbs T 4 TX Pecos gambusia Gambusia nobilis (Baird SC 1,4 TX,NM and Girard) Gila topminnow Poeciliopsis occidentalis E AZ,NM (Baird and Girard) Sticklebacks, family Gasterosteidae Unarmored threespine Gasterosteus aculeatus E 1,4 ' CA stickleback williamsoni Girard Sunfishes, familv Centrarchidae Guadalupe b~ss Micropterus treCl/li (Vaillant SC TX and Bocourt) Perches, family Percidae Fountain darter Etheostoma fonticola E 1,5 TX Gordan and Gilbert) Gobies, family Gobiidae 0' opu nakea Awaous stamineus (Eydoux SC 1,4 HI , and Souleyet) , t Tidewater goby Eucyclogobius newberryi SC CA , F (Girard) O'opu alamo'o Lentipes concolor (Gill) T 1 HI O' opu nopili Sicydium stimpsoni Gill SC 1,4 HI Sculpins, family Cottidae Rough sculpin COitus asperrimus Rutter SC 1 CA Utah Lake sculpin Coitus echinatus Bailey and E 1,4 UT Bond Shoshone sculpin Coitus greenei (Gilbert and SC ID Culver) -l-Present or threatened destruction of habitat 2-Overotilization 3-Disease 4-Hybridization, competition, exotic or translocated 5-Restricted natural range Lockhart provided data on woundfin from 1973. Brian Wilson assisted greatly with de- velopment of data on parasitism, which could not have been accumulated without accessi- bility to fish collections at the University of Michigan Museum of Zoology (R. R. Miller), the University of Nevada-Reno (Ira LaRi- vers), and BYU (Dave White). Encour- agement and approval of permits necessary to the work has been provided by the Ne- vada, Utah, and Arizona Game and Fish de- partments. Stimulating discussions and searching examination of values have been provided by my family (Maxine, Dave, and Jack and Cindy Williams) and by classes at UNL V. Financial assistance for various as- pects of work reported herein has been pro- vided by the U.S. Fish and Wildlife Service, National Park Service, National Science Foundation, Sport Fishing Institute, U.S. Bu- reau of Reclamation, University of Nevada- Las Vegas, and the City of St. George, Utah, through Vaughn Hansen Associates.