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<br /> <br />hottom The ~ca.lt-s are reduced to bonr pla!det~. <br />some of which form lunRltUJIO.dlr arra.n~t'd nd!:es <br />rhat mar functiun to direct W,Her on:r the body <br />surface and aSSist In malOtena.nce ot pOSitIOn In SWift <br />runs. \Voundfin select are,IS WIth rocky sub~trate In <br />curn-nt fllt sp.lwnIOR. .It J tempn.Hure IJf about 2') <br />C Youn,l: gh)W rapidly. JChle\'lng It'n!-:th" of 20 (0 <br />,10 mOl a month lIr tWO after hJ.rchlO.c:. Thc- speues <br />was known from tht. GilA and !'lwr-rmnsl Color;tdo <br />ri..-ers In the !ale I XUOs but smce then h,IS heen <br />found only 10 rhe Vir,gln Rl\'er m,llnS[ft'arn. <br />In the Rio Y,lquI. the Paull, sh'ldhu'dimlol de! <br />P,uijito (FIg. 69) is J ffildwatl'r IOh.lbuJnt of lakes or <br />open pMtS of rin.rs. They ked on Ilm-I~' dlnded <br />Jetrltal ffia.terlaJ from the hottom ur on plankton In <br />the water column. Jnd In dOln.l; Stl Jet as an avenue <br />(or thest Iuodstuffs through the lo"d cham (ll largl.r <br />llshts. Shad In trtshwJ,ters proviJt. .1 f"od baSt" Il)r <br />preJJtt>r)" Ilsht~ lUSt JS Anchuvles pronde loud lor <br />lar.cer tlshes In dlt St;1 \\'ith consrruuion Jnd /lllln~ <br />of reservmrs In tht' Rw YaquI systt'm, Panfic shad <br />appeared f.u inland. rhus Jctlnf: .IS foragt" Illr IJrgt'r <br />fishes In those newly creJtl'd hahn.lts The thread/In <br />shad. .I slmiLir spe(lt:s from eastern JralO,iRts of [he <br />lJnltt'd States ,Ind .\lexlco. h;ls recently bt'en <br />Introducr-d 10[0 the Rm YaquI baSin. [he results of <br />\\"h1(h Me nO[ predll:table. <br />The YaquI utll..h (FIF. (2) rt'sembles tht' common <br />channel car/Ish ot eJsttrll :-\onh Amtrica. Thq <br />ctlmmonly ,Kh'e\'e mort rhan lO on In len.crh .lnd ,I <br />kilogram In \\,t"lght. Jnd live m rtl.H1velr deep \\,Utr <br />dur;ng thl' dJ.~.. 'only to move onto rlme's and runs ,it <br />nl.cbr [0 ft<-,d. The few swnl.lchs that haH' bt't'n <br />ex.lmmed con(,llned aquJ.rll Inv...rrebratt's. otht"! <br /> <br />Figure 70, Sinaloan clchlld/mojarra <br />sma/oense, 125 cm In IOlal <br />length. from RIO ChiCO. Sonora <br />Stalus 01 this species IS unknown <br /> <br />.- <br />r <br /> <br />I <br /> <br />. <br /> <br /> <br />- <br /> <br />~ <br /> <br />'I i; l <br />~ {~.;i~' <br />, ,...'- <br /> <br />Figure 69 PaCllic shadlsardimra del PaCifiCO, 17,8 cm in <br />IOlallength, from Manna del Rey, Presa Alvaro Obregon. <br />Sonora Status of thiS mldwaler, pOSSIbly esluanne species <br />IS speculative It IS l<.nown 'rom scaflered localities near the <br />sea In western Sonora, <br /> <br />tlsht's, and <lr,l!:anll dentls, Spawning IS arp.lrr-ntly <br />s1l11llu hl c:hannel car/Ish. with [he m,lk' defending <br />t'ggs In a depreSSion or holl- LO the bank and <br />protl.ctln~ his newly h.ltcbeJ rUling for a tlm.... <br />Yt)unR h\.e In shallll\\t"r WHer than adults. uften on <br />t1ftlt:s .lmonF cobble Jnd boulders. Channel. blut. <br />'InJ t1.lthr-J.d catfIshes from t.astern North America <br />havr- now been Introduced Inw the Rio Yaqui <br />systt'm, and there IS dlreaJy eVldenct- uf hybtlJization <br />ht-twt't'n tht' Ilrst ,lnd th(' Yaqui (atllsh. <br />La~t Jmong rhl. frt'shwJter tlshes (harucr{-rizlnf: the <br />IU\\"t:rmost Rill YaljUl baSin IS tht- colorful Slnaltlan <br />(lchild (Fig. ~Ol. wluch h\'t~ In quiet W.Ht'rs of <br />the mamstrl;am. crt-t-k mouths. and sloughs and <br /> <br />35 <br /> <br />01110 <br />