|
<br />.
<br />~
<br />
<br />I q 1[;0
<br />
<br />\Ja1 \ u~(
<br />
<br />"
<br />
<br />TilE STATUS (.IF TilE FISH FAUNA UF THE LAKE ME.".D
<br />>:\'f'IU:'>JAL I{ECI(I~.\TJONAL j\I{EA, ARIZONA-NEVADA
<br />
<br />() wr /I ELl.O 1.. \N 1\1,1..1 S
<br />
<br />L'. .'J', J ),'/'orlll/CIII of Ihe [1I1ajor, National Park .,,'en,iet'
<br />l'o.\'t'lIzil,' :\'aliollal Park, California
<br />
<br />/\IIS'('I~M"r
<br />
<br />Tile t.',d"L"I" }(I\','r I\"w,; I"r nead)' 2.!.S Illiles llir<Jllgh tll<.' Lake :\'Iead
<br />:,'I:j,"I,,1 h:"CI""'"'JlI;t! Area. Ar;z(Jna-N""..da.. Its character- ha" IlL'ell ClJlllrtilled
<br />,II III clldllg,d ,IS lht I' ,nh "t ('(dhlllllllun (Jj J l(JlIver and U;lvis j);mls. Th~
<br />(lllnplJ...ilit,J) tlf 1111' li....ll f;,tllll;.j Il;l~ challgl'd, ;d.'iCl, Tlll'rC art' IlllW hll(I\\'11 frorn
<br />Ille :,rc" .l 11;l1iv,' ,,",.1 11 c""lic sJll'cies. SI" ;J{ldlli(JII~1 l'ISIIl's Ilali\',. III 1111"
<br />( \dtd'~id\l !{i\",.:r It~v..,i\\ .uld h\'\\ ut\l\:r ;d\l'U It)rlll~ lHd)" un.::llr.
<br />
<br />l 'JlJlIJl'lllIIIIJ \\ jtb Ihe t'ldJiic .'Jpl"cil's ~Ild Cll;lllgt':-j ill l'c(JI(Jgical CllllJiliull~ uf
<br />II... li,.,'r I,av<' apl':II" I Ill)' fJr"llgln all/lut declinl' ill thc IlullllJt:rs "i 1Ii1li"c tishes.
<br />'1'I,i:~.,u':lIli.lr idllll;..I, ~'I' p~ll)r].\ kllll\\'11 at p1'l.:~(.-llt, ...;huuld he till' "hjl'ct uf r~_l_(Jrl:
<br />"':l:"n--n1-dl-r i-IlYI':-;1i--c--;n-j"i,]j ;tflll ...;nr\'l'\' th..'jiJH:' -jl -tJe('illllL-:-i' l'xiiJlC't Ill" 11:-. L\lIllpu~illllll
<br />j, iurther ;dtl'l'l:;t. '
<br />
<br />llllr'ldlJcnl '1>l'l';I", have illcrl';l,...1 ,ince Ihe IJ\lildlllg. (lj 11(1(1vU' Dam. The
<br />I;lr!,elll"'llh hl:Jl'h; I",,, j, Ih,' Illust IIllIHJl'lalll gallic species ill LI\.:1' },,(cad alld
<br />thl' railil",w Ir"ut h tile leading sp"rl ("h ill Lake ~!"hal'l'. It i, prllllalll)'
<br />l\llIh.:('I.:~~;t"Y 111 11;1\"\' d Clthed fi;-,hillg ....l';I:-.UII IH'C;Uhl' till' eX'ltic g~lIlJl" ti:-ihl'S are
<br />'... tinlJll' ,',I"lllhl",,1; llJlr"dlJelililJ <If additi<lIl;,1 ;,1il:1\ S\ll:<:;l" is "<1\ \'l'ClI11l-
<br />1lI/'IIlit'd,' J;urtiJl'I"'''l'LillP. "I tIll' LirgI.'11l"L1th iliad, I,a", "I' f"r;lg,' tishl's ill l"lke
<br />.\ll'ad j, di.,cI/Ilra!,,'d. alihl,ugh cOlllillLll'd I'lalllillg "f I'aillll"" \i",ut b~luw
<br />H ""''1.''1' !)'"H is Jl,'c,'s,ar)' \ll llll'et allgler,' dl'lll;l1lds, F"nlwl illvestigali(lll (If
<br />the ,p"r1 li.,;IIL'r\ ill l.;d,,' J\1cad !\::Itiunal Henl'ati,,";d Ar,'a j, "'~S1rable.
<br />
<br />Fish FaltJla vf Lake Mead
<br />
<br /><ZD31
<br />85
<br />
<br />NOI:<:IN n.h f .
<br />"'i~J by (,9i'yrl;,.;,tl,;r'/ \'" W
<br />
<br />l
<br />
<br />lr\T1WDUCTION
<br />This repurt, in which native' and exotic fishes ;Jrc discussed, is an
<br />altempt 10 n:\'cal \hc prl'~el\t s\;ttus llf thl' Jish fauna oi Lake Mead
<br />;\ational l~l'(.'rl';ill"ll:d :\l'l',1. ;\rizlln-Nl'vada, as a contribution to the
<br />existing- kl){.\I kdgl' of Ill(' rlsh conljlositiol\ oj the Co}.!!'ado River.
<br />EVel"ln:11I11 ;lIId J~uller (IS'J)), Cillll'rt ;lI\d Scofield (1898), Snyder
<br />(191S).lJill (1Iq4), alld J\lilln (FJ4()a, h) have already suggested that
<br />Ihe illdigullJllS hUlla of lhe Colorado RivlT is not rich in species but
<br />is of interest bccause of its high degree of endemism. The fauna is in ;b
<br />urgent nced of further research, hl'C:luse many forces are fast exter-"
<br />minating it (Dill, lLJ+4; Miller, 1 <.)4(la, b). iij'
<br />The lishl's uf the Lake: ?\Il'ad National JoI.ccreational .Area consist of _.%;".
<br />3. nativ~ an.d 1 I exotic specics representing six !amilies. In addition, ~
<br />SIX natIve hshes and two exotic forms are menl1oned. '~!lN!'
<br />Studies of the fishes of this area by Morrett (1942,1943) and Eicher ..~~:
<br />(1947) primarily considered management of the introduced game spe- "i',
<br />cies of Lake Mead and of the Colorado River below Hoover Dam.
<br />
<br />84
<br />
<br />7 ".,..,L .L v-<. L1 ~- {?'/I ~ .~._ h -J- i-~ , I ~ S
<br />_~~ r;,. < -'I ';"D..-L-...{LI=-- JL ClY.E. ____-.
<br />S I.) (" ~ ~ f Y I v. J' 0) II ~-O
<br />
<br />\~,'~-,,"".""'i~~.[fr~~'
<br />
<br />f,' ,: ". \_..;: .1"
<br />
<br />; t',,, ~,~
<br />
<br />
<br />'1 I.
<br />
<br />
<br />NEVADA
<br />
<br />UTAH
<br />..-....-..-..-
<br />ARIZONA
<br />
<br />'.
<br />
<br />'(:-.,
<br />of(;~ Sl'ARCHL'GH
<br />"'o~;\...
<br />+... .f'"
<br />of ,of ()
<br />" of
<br />'.
<br />"
<br />
<br />LAKE MEAD
<br />NATIONAL RECREATIONAL AREA
<br />ARIZONA. ,NE VADA
<br />
<br />PJGlIl'E I.-The Lake Me;,,! Natiunal Recreation Area in Arizona Hnrl N~vada.
<br />
|