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<br />eta ~ -~.. <br /> <br /> <br />Figure 47. Desen chublcharailro del desierto, 150 mm In <br />total length, lrom RIo Malape, ThIs species was only <br />recently separated and named as distinct from the Yaqui <br />chub. It IS widespread In the western RIo YaquI, Rio <br />Sonora, and RIo Matape. bul highly local in occurrence <br />Photograph by B D DeMarais, <br /> <br />ArizonA. Desert chub occupies the nonhwt.stt"rn Rio <br />Yaqui basin. and the ,IJ1.lCem rlOS S\.lnoro.l and <br />"latare. YaquI I,:hubs are small. usually less than 130 <br />mm totallt:ngth. and chubby bodied, with small fins <br />and mouths. They tlccupy pools of cr<:{'ks. marshes. <br />and othr-r quiet watt'r habitats. of [en in aSSO(latJOn <br />with dense aquatic ,.egr-tatwn. Fnods COnsIS( mostly <br />of small IOH.nehrates, algar, and or~anic debris. <br />TheF hreed srof<ldicallr through()U[ the summer. <br />with males becoming gra.r blut" when In breeding <br />condition. Desert chubs tend to grow a bH largn. <br />often to more than 15 em [0[;11 leo,!,.'th. They ate <br />slmtlar In t'cology, rout may more often prt:fer pools <br />of streams than ffiarshts. :\'orhlng is known of [helt <br /> <br /> <br />Flqure 48. Undescrlbed chub/charallro. 86 mm in lolal <br />length, lrom RIO Paplgochlc, ChIhuahua. In 1978. II was <br />relatively Widespread in the RIO YaquI baSin: the American <br />Fisheries SOCiety did not conSider 11. <br /> <br />foods or bn:e:ding habIts. Even less IS known of the <br />undescnbed speCies of chub (Fig. -'i8) found In the <br />eastern RIO Y.1quI basin, other than ItS g{.neral <br />dIStribution In streams hl~her than liOU m. <br />The Gila chub (Fl~. .19) IS endemiC to the GiLl <br />RI\"C:r l->JSIn, luwer Color.ldo system, .tnd is also <br />chdt,l(terlsuc of rOtl[~ In sm,lll stre,lms. marshes. and <br />other quiet places. FemJ!t.s ,Ichl(:'ve lengths of 25 cm <br />totallen,,,th: males ruely grov. lon~er thAn IS COl. <br />Fuods incluJt" both iJrge and small invertebrates, <br />small tlshes. alpr-. and or~anlC debris. As with <br />Y;lqUl chub, breeding seems to he sporadic <br />throughout the Srrln~ and summer. ThiS fish was <br />widely dis[fJrouteu in IsoLUt.d hdoitJrs. occurring In <br /> <br /> <br />Figure 49 Gila chubfcharallto del <br />Gila. 142 cm 10 lotallenglh, lrom <br />Canelo Cienega, Arizona ThiS <br />species is endemiC 10 the Gila <br />River baSin, and IS conSidered 01 <br />speCial concern. It may be <br />extIrpated 10 MellICO, but still <br />occurs In scallered localities In <br />the UOIled States. <br /> <br />~~.(~,tJ,. <br />-..r;:l . ....~.;,;.~ <br /> <br /> <br />24 <br />