Vou-r“c,)OMI - I\tsr$D f 996

Year: 1995 (xxvii)

Abstract

A quarterly sampling program was impleme{“d :l 1993 to determine life history parameters ano habitat use of White River spineda ce Lqilkeda albivallis. Benthic and plankton samples were obtained from North Flag Spring to dassify *d ;;C potential food items. coinhabiting speckled dace and desert sucler were collected in 1993 and lggifor aging 4nd gut content analysis’ SP’nedace museurn specimens colrected in rg3g from North Frag spring *&” ig“a “i.a t” gut contents alar.rrzed ro determine age dass strucu’e and food habits of the historiJpop,rt.ior, rr,d .onl.rt them with the current population’ The results will be disPlaYed. RESLn{EN En 1993 se implement6 un prograrna cuatrimesotd“ muest’reo para delerminar los par5metros del ciclo de vida del white River spinedacJ, tEulnrao ahivallis. Se obtuvieron muestras de bentos y piancton en North Flag Spring para clasificar y or“r,,:n.rr los potenciales comPonentes de la dieta’ En i993 y 1994 se colectaron individuos cohabitantes del speckled dace y desert suckir para determinaci6n de la gstructrira de edades y an6lisis de contenidos estomacales. S” i“s determin6 1a edad a especimines di museo de Spinedace colectados en 1938 en North Flag Spring y se les analiz6 los contenidos estomacales Para determinar la estructura de edades y hSbitos atrimentarios de la poblaci6n hist6rica y contrastarla con la actual. Se discuten los resultados’ HEn rmclr ,1.E.;SlOsnRC, I. C.‘; WlrnERs, D-; BEls, S’; Wpnpol’. S:; Sr’ GsonGE’ D’ oH’ ‘}Nrysd8 Dtvr’im cf WIldMc, R.Ekn Il1, Ls Vcgu, NV. ;DW, SB, S^r’.U.S. Firh sd wiliullc sc’t/c, R.gim i’ Eol%iol Swls Sur ofic, Rcn NV; D9Ash Mcrdm NrOool Wiidlt$c Rcfue) Southern Nevada Eco’region Report r , , , ^1-r^r r^^^. .-iaolr IGYWoRDS: dace; Pahranag.tv^ll”y; poolfish; sucker; roundtail chub; speckled dace; spinedace; Virgin River; l,i“aay Rirr”i;ot-dfin, White River; pupfish; toad’ The Nevada Dvision of Wildlife (NDOW) currently assists in managing twenly endangered and five threatened species or subspecies of federally listed fish. Activities of the native fish program continue to concentrate on recovery actions or conservation actions dealing with these specific fish and also state sensitive or federal C2 fish. The follorruing species or subspecies, including one amphibian species’ received attention in 1994-5: .t - <^ a^L -^- ’ White River spinedac e, Lepidomeda ahivallis - Estimates continue to indicate less than 50 fish remain in a singte spring on State lands at the lcrch lyvildlife Management Area’ In eariy i995’ fourteen fish were captured from the springhead and moved to dotnstream habitar now available after largemouth bass rerno’al. Reproduction and recnritrnent will be evak:ated during September and october 1995’ A contract with the National Biological Senice (Ntss) will continue at this site to gather habitat lequirement information and assist in recovery of this species’ 4l