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<br /> <br />clt'\'e1opt:d 1J.f~t' pOpul.HlOm that ,lppe;lfeJ TO <br />outnumbrt ;lnd outcompete the Indl~c"m~us klnds_ <br />^mon~ tht'se problems. hyhfldlzanon prest:lHs thc' <br />weates[ dan,l:er ro spt"C1e~ Integflty ;lnJ sur\"I\'J,1 B~ <br />the 19705. ~c'm"tLc (ontam,n.ITion had reduCl'll <br />Apacht: tmuT tlI less th,ln 'S.nGy of its t"ormt:r ran~e. <br />The Gll,l trout similarly sur\'I\.t:s In n,HurJ.l <br />populations In onl)" .I li:w hC".lJwJ.ter stft:affi~_ Only <br />inaccessibility tl1 s[Ockln,L:. ,mJ n.Hur,d barrll'rS (0 <br />subsequtnt upstr!;'",lffi ffiU\'cffient stupred In\aSlllnS of <br />non.n,Ltl\'c" tWUtS .lnJ prt:H'med complete loss 1)( <br />these two srell.1! nann:s_ Both :ue fedt:"r,dl~' hsrt:"J. .IS <br />threatem-d and end.lngc.rc'd. respl'uIHly <br /> <br />Figure 11. Juvenile trout (no common name). 62 mm In tolal <br />length. also an undescrlbed species from the RIO Mayo <br />drainage (Arroyo de la CaSlla), Chihuahua All 01 the native <br />Melllcan troulS are conSIdered 01 "speCial concern" by an <br />internallonaJ commlltee of the American Flshenes SOCiety. <br /> <br />All thest. trOUts h.l\t: Similar t"Ctlh1.l!It:s. LJt!(t'" <br />mJI\"lJuals ll\'t: In Pllllb" whdt: sm.dler nnt:s rt:maln <br />11I.:-.lr Ilhstructl~lIlS or IHht:r cover such H oVt:rhangmg <br />trl"t"S or brush In runs and rimes. All sp:lwn shordy <br />all:er snowmelt. ,1OJ yuun,!; h.l(ch and grow rapidly In <br />[hr w;nmln,L: w,lters of early summer. VariatIOns in <br />color pant:rns Jre pronounced. t"\'t:n wlthm Single <br />rupularlOns. some III wluch mar rdlen hybtLdlZ.ltlon <br />with rJlObow ;tnJ cutthroat [routS in bOth tht: <br />Co!or.ldn .lnJ YaquI systl"ms. <br />In ,HlJltlOn to tht: JJn~t"rs of Inrroducl"J relau\"es <br />[hat hyhrl\Jizc' with them. .lntl the lIl\'<lSIOns (Ot <br />swckJn...-:) of rn:-J.lt\lry and comrc"t1tl\"e speCIes. <br /> <br />Figure 12 ApaChe \rOUt. 21.0 cm In tolal length. Easl Fork 01 Ihe White River. <br />Atlzona ThiS threatened species generally remains small (less lhan 20 em) In smaller <br />streams. but attains 45 cm In artifICial lakes <br /> <br />p ~ <br />~~~~' <br />_~ '"~"::"',f,.,: . <br />- - .!.. .. .. - . <br />_....._........._..~ <br />-".. :-.~.~.-. <br />. a._~:".... ~.' <br />__- . -~..v.....~..... .' <br />-~ .:....... .,-;;r;~. ;.....' .... " I' .., .,' . <br />:- ... .... .. ....&. ,0' .... Ot. ' , t It . <br />_ J.. _ '. '1' . ." . . . \ . . <br />~ .. r-.- ...... ...--, . _ .. ..." <br />';. "-~.'....." ~ '. ~t .. ... , ". ol: I . ..... . I ." . <br />~ . ~ : ..',. ". . 0 ,. <br />I&- li>"-~; _ .. ,'.' I ". <br />.. - ....."lo . . . <br />- ...~;.... <br />" :. ,.- <br />;.. .-}<-. <br />.,. -. ... <br />... .. ..,,;.- <br /> <br />-' <br /> <br />II <br /> <br />. ....- <br /> <br />. <br /> <br />." <br />. <br />.. '.t <br />. <br />'~.'~.' <br />l tI. <br /> <br />. <br /> <br />.-'.. <br />, - <br /> <br />. .. <br />. . <br /> <br />. <br /> <br />. <br /> <br />- : .....i..... <br />f.~~ <br />~" <br />. - <br />- <br /> <br />. <br /> <br />';' <br /> <br />- <br />~ <br /> <br /> <br />8 <br />