„ 34 



E 

 E 



32 



30 



28 



26 



24 - 



22 



F 20 



uj 18 - 



- -9 



y = 1.610 + 0.023X 

 (1= 0.489) 



1 



30 



32 



34 36 38 



FORK LENGTH (cm) 



40 



42 



Figure 6.-Regression of length of rainbow trout dam from the 

 Deschutes River on length of otolith nucleus of offspring cul- 

 tured in Corvallis, Oreg., 1972. (Circles are means, and vertical 

 bars are ranges of observation.) 



ACKNOWLEDGMENTS 



This project was funded jointly by the Oregon 

 Agricultural Experiment Station, Oregon State 

 University, and the Research Division of the 

 Oregon Wildlife Commission. F. H. Sumner, Scale 

 Analyst (retired), Oregon Wildlife Commission, 

 advised on scale reading. H. H. Wagner, Chief of 

 the Research Division, Oregon Wildlife Commis- 

 sion, gave many useful suggestions for the 

 research and reviev^^ed the manuscript. R. E. 

 Millemann and W. H. Staeger, Department of 

 Fisheries and Wildlife, Oregon State University, 

 also critiqued the manuscript. 



LITERATURE CITED 



Blaxter, J. H.S. 



1969. Development: eggs and larvae. In W. S. Hoar and D. 

 J. Randall (editors), Fish physiology 3:117-252. Academic 

 Press, N.Y. 



BULKLEY, R. V. 



1967. Fecundity of steelhead trout, Salmo gairdneri, from 

 Alsea River, Oregon. J. Fish. Res. Board Can. 24:917-926. 

 Galkina, Z. I. 



1970. Dependence of egg size on the size and age of female 

 salmon [Salmo salar (L.)] and rainbow trout [Salmo 

 irideus (Gib.)]. J. Ichthyol. 10:625-633. 



KiM.W.S. 



1963. On the use of otoliths of red salmon for age and racial 

 studies. M.S. Thesis, Univ. Washington, Seattle, 63 p. 

 Kim, W. S., and T. S. Y. Koo. 



1963. The use of otoliths for age determination in red salm- 

 on Univ. Wash., Fish. Res. Inst., Coll. Fish., Contrib. 

 147:17-19. 

 King, D. N. 



1966. Deschutes River summer steelhead. Oreg. State 

 Game Comm., Cent. Reg. Adm. Rep. 66-3, 41 p. 



LiNDSEY, C. C, AND M. Y. AlI. 



1971. An experiment with medaka, Oryzias latipes, and a 

 critique of the hypothesis that teleost egg size controls 

 vertebral count. J. Fish. Res. Board Can. 28:1235-1240. 



MAHER, F. p., AND P. A. Larkin. 



1954. Life history of the steelhead trout of the Chilliwack 

 River, British Columbia. Trans. Am. Fish. Soc. 84:27-38. 

 McFadden, J. T., E. L. Cooper, and J. K. Anderson. 



1965. Some effects of environment on egg production in 

 brown trout (Salmo trutta). Limnol. Oceanogr. 10:88-95. 



McKeRN, J. L., AND H. F. HORTON. 



1970. A punch to facilitate the removal of salmonid 

 otoliths. Calif. Fish Game 56:65-68. 



McKern, J. L., H. F. HoRTON, and K V. Koski. 



1974. Development of steelhead trout {Salmo gairdneri) 

 otoliths and their use for age analysis and for separating 

 summer from winter races and wild from hatchery 

 stocks. J. Fish. Res. Board Can. 31:1420-1426. 



Montgomery, M. 



1971. The Deschutes fishery. Oreg. State Game Comm. Bull. 

 26(3):3-5, 7. 



Scott, D. P. 



1962. Effect of food quantity on fecundity of rainbow trout, 

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659 



