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<br />Cimarron Dredging Environmental Assessment <br /> <br />Division of Wildlife (CDOW). This stretch of river has an excellent rainbow and brown trout <br />fishery. These populations are self-sustaining; however. whirling disease has greatly reduced <br />recruitment for rainbow trout. The CDOW conducts an annual fall (September) survey on the <br />Gunnison River below the Black Canyon of the Gunnison National Park. CDOW does not <br />directly stock Crystal Reservoir: however, Crystal Reservoir does receive fish that survive the <br />entrainment from Morrow Point Reservoir and the Cimarron River. Morrow Point Reservoir has <br />been stocked with kokanee and Colorado River cutthroat trout. Entrainment from Blue Mesa <br />Reservoir also provides a significant number of fish in Morrow Point Reservoir (Hebein 2001). <br /> <br />Fish species lists for both Crystal and Morrow Point Reservoirs are identical even though the <br />sources of species varies. These include: Kokanee (Oncorhynchus nerkus), rainbow trout, brown <br />trout, brook trout (Saivelinas jonlinaiis). Colorado River cunhroat trout (Oncorhynchus clarki <br />pleuriricus). possibly Snake River cutthroat trout (Oncorhynchus clarki sp.). Mackinaw or lake <br />trout (Saiveiinus namaycush). longnose sucker (Catoslonws catostomus). white sucker <br />(Catoslomus commersoni), bluehead sucker (Calostomas discoholas). longnose dace <br />(Rhinichlhys ca!uraclae). monied sculpin (CallUS hairdi). Hybridized remnants of flannel mouth <br />sucker (Catostomus ialipinnis) may also be present (McCada :WOO. Hebein 200 I). <br /> <br />According to Nehring (1988), critical time periods and tlows for rainbow and brown [rout are as <br />follows: <br /> <br />Table 1 - Rainbow & Brown Trout Critical Time Periods <br /> <br />Species Life Stage Critical Time Period Minimum Flow <br />Brown Spawning. OCt 15 - Nov l5 300 <br />Brown Incubalion No\' I - AprOl 300 <br />Brown Hatching Mar 15 - May 15 300 <br />Brown Fry MayOI-Junl5 300 <br />Brown Ju\'enile Jun 15 - OCl 15 300 <br />Bmwn A.dul\ A.n YeM Long 300 <br />Rambow Spawning AprOI . May 15 JOO <br />Rainbow Incubation Apr 15 .Jun 15 300 <br />Rainbow Halching Jun 01 - JuJ 01 300 <br />Rainbow Fry Jun 15 -Jul 15 300 <br />Rainbow Juvenile lullS - Oct 15 300 <br />Rambow Aduh All Year Long 300 <br /> <br />12 <br />