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<br />. '!o ,,' Ii: · <br />. <br /> <br />0022~7 <br /> <br />e <br /> <br />e <br /> <br />area between Bluff, Utah and Mexican Hat around RH 75. One eguawfish captured <br />at RH 74.8 made a 50-60 mile migration to the ~Mixer" area (RH 133.4 to RH <br />129.8) during the suspected spawning season in 1994. The fish then returned <br />to within 0.4 river miles of its original capture loca~ion. Young-of-the-Year <br />squawfish have primarily been found in the lower 4 miles of the San Juan River <br />and the Lake Powell inflow area as far as 6.3 miles below Piute Farms. <br />Lashrnett (1993, 1994) collected a total of 12 Colorado squawfish in this area. <br />Archer et al. (1995) captured 7 YOY Colorado squawfish in 1994, including 6 <br />between RM 8.0 and 25.2 and one at RM 122.6, during nursery habitat studies. <br /> <br />Only one razorback sucker has been collected since 1987 in the San Juan River <br />(BioWest 1995). This adult was collected from a main channel run near Bluff <br />(RH 80) in April, 1986 (Platania 1990). Additional adult razorbacks have been <br />collected from shoreline habitats in the San Juan Arm cf Lake ~owell. S~udies <br />of stocked razorbacks in 1995 and future years may provide information on <br />important subreaches for this species. While sexually ripe razorback suckers <br />have been collec~ed from the San juan River and the San Juan arm of Lake <br />?owell in recent years, no young-of-the-year or juvenile razcrbacks have been <br />sampled from the system; therefore, recruitment by this species may not be <br />occurring (Platania, 1990). <br /> <br />:n addi~ion ~o federally listed species, a ~ela~ively large popula~ion of <br />native flannelmouth suckers (?latania; 1990; Biowest, 1995) and possibly a <br />small population of roundtail chubs also exist in ~he San Juan River <br />cownstream of McElmc Creek (pers. comrr.. ~o~ Beck, CDO~, :988). :t is possible <br />~ha~ ~hese species mar a~temp~ sp~wni~g in ~his sec~ion c= ~he San J~a~ Rive=. <br />3~n~ie= e~ a~. (1994) collec~ec young =ounc~ail chubs i~ backwa~e=s below ?~ <br />:00 in the San Juan River in ~992. Gido anc Propst (1995) capturec E <br /> <br />=o~nd':.a.:..l chub ir: 15-93 a:1c 4. .:..:-: 2.994 _i:: seconda=y =:-..a:1~els be-=.weer: ?~~ E:.~ a.nc <br /> <br />1.34.;. <br /> <br />:t is possi=le ~ha~ ~05~ == ~he =ounc~a~: chu= ~~ ~he ma~~ Sa~ Jua~ <br /> <br />River come from ~he Mancos Rive~ O~ o~he= ~~ibu~aries ~ha~ na=bo= hea~~hy <br />populations (Buntjer et al. :994). <br /> <br />:~plemen~a~ion 0= the p~o?osed ac~ic~ would no~ ~esul~ ~n an ac~ual deple~ioL <br />=ro:r. ~he Sar:. Juan River, c~l;." c. recuc-:.i.on in the. esti.rr.a'tec ".olume 0= po~en't.ia~ <br />return flows. ~herefore, implementation. 0= the proposed action would not <br />cii=ec~ly irnpac~ endange=ec .cr canci~da~e fish populations exis~ing in the San <br />Juan River. :n su~~ary, Reclamation concludes this action would net ef=ect <br />either the pro~ec~ed Colorado sguawfish and razorback sucker or their critical <br />habita~, c= the candida~e species; the flannelmou~h sucker and =oundtail chub. <br />