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<br />Zones (nhorcl1nes) where bRsB are Bpnwn1.n~. <br />wave action CBUSe the bass to display erntic <br />abandon their nesta. <br /> <br />Thit; colder 'oJoter and <br />spnvning h~hav lor .,nd <br /> <br />linSR have been observed to abandon their nests when temperatures <br />drop 40 to 60 F. This type of behav1.or was documented primarily ",hen <br />",ater temperatures "'ere in the mid-60's and then dropped 40 to <br />60F. Temperature variation also can delay egg hatchin!; time and <br />promote fungus growth. Sac-fry duration may also increase, thereby <br />exposing them to more predation. <br /> <br />F. Recreation. <br /> <br />1. Related to the Reservoirs. <br /> <br />a. Lnke Powell--At 1ts nonnal operating level, Lal,e Powell <br />provides 130,000 acres of surface for swimmIng, bonting, "Inter sl:iing <br />8nd fiBhing. For the sightseer and explorer, it provides over 300 miles <br />of canyons carved from rock of every dcacrJpt:lon llnd color. <br /> <br />h. Lake H(!Jlo--lloovcr Dam and itti l,Akc Hcnd hllvc crcntcd one <br />of Amerien' B most popular recrention nreas. ^ 12-month f>cn~on attr:1.cLg <br />about 6 million visitors each year for s",itmlinp., hoatinr.. Aldin:>., amI <br />fishing. Largemouth b8SS, bluegill, black crnppie, trout, chnnllel <br />catfish, and other apecies inhabit the lake. There is no closed season <br />on fishing, and anglers take large numbers of game fish each year. <br /> <br />o <br />,.. <br /> <br />Related to the River Below the Dams. <br /> <br />a. Glen Canyon Dam Tailwater--Releases from Lak" Po",e11 are <br />normally so planned that a continuous flow of at least 1,000 ftJ/s <br />will be maintained in the river below the dam for fish habitat. During <br />the river-running season through Grand Canvon, minimum releases are <br />3,000 ft3/o and usually are much higher. Daily flows of minimum and <br />maximum are posted at Lee'a Ferry and Phantom Ranch for the convenience <br />of the boaters. All wster released from Lake POIJell iR being p.1ssed <br />through the powerplant. <br /> <br />b. 1I00ver Darn Tailwater--Releases from Lake flea" arc <br />Rcheduled t~ satisfy downstream "'ater use re~uirement6. t'!inimulll (lows <br />of 2,OfJO ft /s are maIntained to assure a live stream fishery he10w <br />1I0over, Davis, .111d Parker nams. <br /> <br />18 <br />