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MAY-14-97 WEll 12:25
<br />di;Lmeter) sub-
<br />d 2s LI~e elp8wrt-
<br />~]isht~d whett a
<br />of ripe mnic~
<br />o~cr the prop-
<br />7-10 em}.
<br />t'sive anti dmp
<br />ales, wlsere they
<br />K•clu~ primarily
<br />~C[dtLO'e3 rC',aCh
<br />liuraal leretirar~
<br />m Ti, are rc-
<br />,r c~urrt:nt, but
<br />'f. are able to
<br />ream ut a vari-
<br />v0 mm fn four
<br />of about tl~rcc
<br />taw, i71L! an av
<br />irirlg the i7rst
<br />
<br />itcK;tion, it:Lns-
<br />voiuudfiu. Tina
<br />of the strum
<br />ish. TltCir m-
<br />1 agpreClAted.
<br />rt by CatLlract
<br />7.5. Fish and
<br />prvvidLxl by
<br />tab Fish and
<br />U.S. Fu1s aasd
<br />d~tw.al~d fialtes
<br />+re~. Nlo. 3:41-1i4.
<br />d raatu ®t1Ke to-
<br />x nernlu.r h- Uw
<br />izwu. Capela
<br />
<br />. ~?~,
<br />FISNER~' ~ WIiDLIFE B1U
<br />FAX NG. 9i0A915091
<br />F. O 1
<br />TR..'
<br />EARLY pEVElArMEMT o>< Tim IiA~oRllncx suCKEI't,
<br />XYRA tIGHi;N ~'EXANUS (ABBQ'1'1')
<br />W. L ARimllesy' and Erk 5. CusLS[tan`
<br />Msuu-t:T.- t?ort'tited e»a of tuLtKliack euc:l~er, X~raud~Ca iexanw, wear adhesiYe (nr 7 to 4 boom ahem &:rti{tra-
<br />liurl. t:le~vatro wee cna~ple:led at AaS hours, }~IStmlation trocnrreri Al 34 hours, and bid rtst~ulaxion wati sat;etlislwd flL
<br />117 tunas. FlatcLan~ OeCta'rCd Gnm 5.2 ~ 5.5 days afOar terLilia~tiem Larvae wscc from ~ to 7.~ mm TL a[ 11aLGh-
<br />in~. YoU~ v.L+eswisuit~t~+d at 1S daps {i!1 mm T[.}. AU fuss were Fcmlted and }sat) otal[lcri rays nt (rrt days (87 mtn TG~
<br />The unitr~e Ymchat loaei t(-peartxf ulrottt X10 days ahfr FcrtiiiYation.
<br />Thv raaxirbatk sLSCker, Xymt4eltetr tc,CCtt3tar
<br />{tlbbolt}, is ottdcmiv to Lhe Colorado Etiver
<br />baslm. As with meuh of the eout3swostern lraL-
<br />tltyofanna (i?ister 1417 ft is ciccliniag
<br />abLlrLtlartco (1Viinckley 1953). A probrsm was
<br />cnmrttulCed ns 16174 to develop means ~
<br />prtspagxslirLg the Sptciss ~l ottiey Ifi74) and to
<br />tlcJineate certain ati~ocls of its life histary.
<br />We stuullcd emhryaloglcaI, lax++al, and jLtve-
<br />pile devdopincnt of the speciax in I9r14-75.
<br />A1(ILOLt~L our data are somewhat outdated in
<br />.lift of recent shtdies of caeastomid larvae
<br />(r4wiewed by Fuirnaa sae Witman 1979}, al-
<br />most nolhist~ lass appeared an t]~e early life
<br />history of dtir taigas species. Winn sod
<br />Miller {1954) presented & itey to postlarvul
<br />f~fies of llie lowez Colorado RiVCi ba~m that
<br />iaclutlad plLOtographs and sorttcsdtsr,~riptione
<br />of young R. t~conas. A photograph by
<br />DoLrglas (15152: Fig. 3) wAS reidtmtificxl by
<br />Wiua and Mi11er as speckled dace (Rhi-
<br />nichxlLys oacuduar 1G~ll rathor than % tax
<br />urcua. Z9te present paper thus deAeribes and
<br />tgurot: early lice-histary stages of the razor-
<br />baelc sucker as rk:termiaetl !torn hatchery-and
<br />1a7ao~[atory-resre~d 'nidixfduals,
<br />Morons
<br />Initial irtfarmation on hatchery propilga-
<br />tion and rearing of razorback suckers origi-
<br />nat~ from adult fish seined near Cotton-
<br />wood Cave in Lake kdahs-ve, Arizona-
<br />lYevaclEt, in winter 1974, and was e:ompiled
<br />1 of za~9', Adawa S+Ne unNealtr, rrmpe. Arl~a 6~9T.
<br />by peraatLnal at Willow Beach National Fish
<br />Hatchery (in put, 1'tmey Iy-14). were
<br />stripped !ran, females arnd fertilized, sod de-
<br />veloping ytrit:tg were initially housed m er,
<br />spar TdCeWay at a mean wakes tCTnpCra.tnre
<br />of 14 C, then transicrred 13 dslys pnsk-
<br />hatehiag to an tratcloor raceway where valor
<br />temperature' aversgud 15 C, Samplrs were
<br />preserved daily is j17 percent !'annalin durir-h+
<br />the first month, and intermittently dLCroafter.
<br />j,,s~ postIatval md, juvenile phases davcribed
<br />below ere based tm the 1974 cohort
<br />Additions) adults were trammel netted
<br />from below Hoover Dam and is the vicinity
<br />of Carp Cove in Lake Mohave in Mxrch-
<br />April 1975, Most males were in activo
<br />spawning cor,ditiou, bat female9 were either
<br />spent or oat yeE matut+e. Boilable females
<br />wets interparitotiealy lnjeetetl with human
<br />. chorionic gonedotropin, which inchLCed
<br />avapte maturation. A few hotu~ after ia-
<br />jectioa about 5,0~ eggc were stripped from
<br />a single !stoats and immedietcly fertilized
<br />with sperca of two males, as has been ob-
<br />aervcd is rrsttre'is (Dens 1959}. It is notable
<br />that water-Lardene eggs obtained from
<br />naturally-matLtrcd females in 1974 were S,9
<br />mm digmeter, but comparable ova t>Ulalned
<br />from hoamone-indus:ed matuatioo wore 1.8
<br />torn diarnctcr~ This disparity is faLr greater
<br />than Yeas before bean recorded. in cattastomtii
<br />ova diameters (Fuirnsn and Trajttar ].9$f)).
<br />We assume It rued from pret:ipitotas resat
<br />aratioa after lwrmotte iajecti~s, bttt have no
<br />553
<br />~pearCtl to bt. in - - ~
<br />,._..~~....,.~ .~m~.,.
<br />
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