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February 1983 Notes
<br />
<br />123
<br />Log F =2,54 Log TL-2,54
<br />n= 56
<br />^ r2= 0.45 0
<br />>a 6 Gunnison River -o •
<br />W •• • o
<br />Colorado River-•
<br />~ • • •
<br />o •.
<br />v . .a ••
<br />>` b
<br />v
<br />~ 12 0•
<br />s •' •
<br />~, . o 0
<br />>, . •o S ~
<br />o
<br />~ •o
<br />U 8 0 •
<br />LL
<br />0 1 L I ~ 1
<br />300 350 400 450
<br />Total Length (mm)
<br />Fig. 2.-Rc?anon between fecundity and total length of bluehead suckers Erom the Colorado
<br />(1975) and Gunnison (1976) rivers.
<br />:;lc....,.. of Fla... c'cre Da. vhich ......;Ited ... sh° deck..,,., ... ....._. remperar„rrc _.. the
<br />Green River downstream, apparently resulted in a decline in growth of Colorado squawfish, Pty-
<br />chochezlus Lucius, and roundtail chub, Gila robusta (Vanicek and Kramer, Trans. Amer. Fish.
<br />Soc., 98;]93-208, 1969), and later rainbow trout, Salmo gairdneri, (U.S. Bureau of Reclamation,
<br />Environmental assessment o[ proposed penstock intake modifications, Flaming Gorge Dam, Utah.
<br />U.S. Dep. Int., Bur. Reclam., Upper Colo. Reg., Salt Lake City, Utah, 50 pp., 1975). Bagenal (J.
<br />Fish Biol., 1969:167-182, 1969) indicated [hat Eish with faster growth rates produced more eggs
<br />than fish of the same lengths that had grown more slowly. Thus, [actors that caused observed
<br />differences in growth rates Eor Colorado squawfish, roundtail chub, and rainbow trout may have
<br />had the same effect on fecundity of bluehead and flannelmouth suckers.
<br />We thank George Kidd, formerly of the Colorado Division o[ Wildlife, who participated in sev-
<br />eral collections; Charles W. Fowler, who assisted with the data analysis; Dennis Cox, John Ilend-
<br />erson, and Karl Seethaler, who assisted in the field; and Jay King, Calvin Larson, Kevin Priest,
<br />and Joy ~Vydoski, who assisted in the laboratory. The Utah Coopera[ive Fishery Research L'nit is
<br />jointly supported by the U.S. Fish and Wildlife Service, Utah Division of tiVildii[e Resources, and
<br />L [all SLa[e L'n IY2T51[y.-CHARLES lti. ~ICADA AYD RICHARD ~. ti'r DOS Kt, Ulah COOJJerallLe ~i5hery
<br />Research Unit UMC-52, Ltlah State G'niv., Logan, G'T 89322 (Present address, CWbI, U.S. Fish
<br />and Wildlife Service, 55I 25.5 Rd., Suite 8113, Grand Junction, CO 81501, RSW, Division of Hat-
<br />cheries and Resource Management, G'.S. Fish and Wildlife Service, Washington D. C. 20240).
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