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1582 Resen'oir. !FIM analysis showed mat a year-round flow of 300 to 500 cfs should be maintained, measured", the Wellsville gauge, However. agen- cies ,hat manage fish populations and fish habirar recognize that rhe spring runoff must be passed mrough rhe sysrem. The most beneflcial opera- cion for me fish population would be ro ramp down runoff flows as soon as possible. which cre- ates a greater period of time when ma.ximum habirar area is available to rhe fish population, b. Tutquoise Reservoir and Twin Lakes Turquoise Reservoir and Twin Lakes are primarily managed for lake rrout and rainbow rroUt. Born reservoirs are oligocrophic, meaning rhat mey are low in plant nuerients and oxygen is rypicaJly dis- cribured evenlv rhroughour rhe warer body. Lakes of mis rype are rypicaJlv suired to salmon ids, which JIe oxygen sensitive. Primary and sec- ondary producrion is relarivelv low in bom lakes, rranslaring inro Ii mired food supplies for fish species. Highest production occurs in the warmer monrhs of Julv and AuguSt in rhe euphoric zone, where there is sufficient penetration of sunlighc inco the water column co supporr plane growth. ThermaJ strarificarion ar ,his rime, coupled wim major adjustments in water levels. increases flush- ing of nutrients from the reservoir. l'v1ainraining lake levels and conrrolling flushing rates is criricaJ for successful fishery managemenr. particularly for lake trout. To foster maximum biotic production in these reservoirs md [Q protect and maximize linoral habitat during rhe summer monms, warer surface elevarion should be held ar some Stable level. Filling and maintaining warer levels in Twin Lakes and Turquoise Reservoir as much as possible prior co Oerober 1 ensures inundation of shorelines which provide spawning habirar for lake trour adulrs. Lake trour spawn during Ocwber and November in Twin Lakes. Almough frequencly nor possible, maintenance or continued filling during the winter ensures eggs remain inundated until hatching and fry emergence: in F~bruary or March. Srable w,rer levds from March ro June provides habirar for fry and juveniles until mey move ro deeper warer by June. AdjuStmenrs ro warer levds from June ro August of more mm ro feer from full pool decrease primary and sec- ondary producrion. Mainraining stable warer lev- ds from August ro Ocrober lends Stabilicy to me reservoir, further enhancing productivity. c. Clear Creek Reservoir Managemenr for kokanee salmon and rainbow trom are emphasized in Clear Creek Reservoir. Clear Creek Reservoir is rhe moSt producrive of me mree upper basin impoundments, however, it is srill considered oligorrophic. Clear Creek Reservoir does not experience daily adjustmentS ro its warer level mat Twin Lakes and Turquoise Reservoir do. As a result, Clear Creek Reservoir shows better survival and growth rates, including overwinrering, of key species. Fish popularion need.s are beSt mer if Clear Creek Reservoir is mainrained as full as possible on a year round basis. d. Pueblo Reservoir Pueblo Reservoir is managed as , warm. cool and coldwarer fishery. The coldwarer fishery consisrs mainly of rainbow 'rom maimained by annuaJ srocking. The warm and cool warer fishery is comprised primarily of black basses. crappie, bluegill, walleye, wi pers, and channd c,dlsh. Walleye, wipers, and channel carfish are srocked, while bass and crappie are nor srocked. Ar rimes rhe flucruarion of warer levels in Pueblo Reservoir has been very severe. Major draw downs have dropped rhe warer level up to 49 feer below conservarion pool. Depending on when rhese occur, they can have a major effect on me pro- duction of sport and forage fish. Gradually filling Pueblo Resen'oir from November mrough ~larch aJlows for rhe inunda- cion of vegeration and shoreline which will pro- vide food, cover, and spawning areas in rhe spring. A full reservoir from March to mid-July allows for good spawning habirar. high plankron levds to feed !;y, as well as cover for adults. juve- niles, and fry. Rapidly drawing me reservoir down from mid-July ro mid August exposes shordine for recolonization of annual (non-riparian) vege- tarian and concentrates forage species for maxi~ mum utilizacion by sport species fot growth. 30