£g] LONG SNOUT 

 | SHORT SNOUT 

 ]] UNDETERMINED 



11-15 16-20 



AGE (yrsl 



Figure 2.— Distribution of snout type with age for white stur- 

 geon, Acipenser transmontanus, at Hanford. Age class was 

 estimated from length based on data from Semakula (1963) for 

 the Fraser River. Sample size in each age class in parentheses. 



Semakula, S. N., and P. A. Larkin. 



1968. Age, growth, food, and yield of the white sturgeon 

 (Acipenser transmontanus) of the Fraser River, British 

 Columbia. J. Fish. Res. Board Can. 25:2589-2602. 

 Vladykov, V. D., and J. R. Greeley. 



1963. Order Acipenseroidei. In Y. H. Olsen (editor), 

 Fishes of the western North Atlantic, Part three, p. 24- 

 60. Mem. Sears Found. Mar. Res.. Yale Univ. 1. 



Dennis W. Crass 



Freshwater Sciences, Ecological Sciences Department 

 Battelle Pacific Northwest Laboratory 

 Richland, WA 99352 



Robert H. Gray 



Environment, Health and Safety Research Program 

 Battelle Pacific Northwest Laboratory 

 Richland, WA 99352 



Address all correspondence to Gray. 



Acknowledgments 



We thank C. D. Becker, who critically re- 

 viewed the manuscript, J. M. Haynes, and J. C. 

 Montgomery who assisted data collection in the 

 field, and R. L. Bushbom for statistical analysis. 

 The study was supported by the U.S. Depart- 

 ment of Energy under Contract EY-76-C-06- 

 1830 with Battelle Memorial Institute, Pacific 

 Northwest Laboratory. 



Literature Cited 



Bajkov, A. D. 



1951. Migration of the white sturgeon (Acipenser trans- 

 montanus) in the Columbia River. Oreg. Fish Comm. 

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 Haynes, J. M., and R. H. Gray. 



1981. Diel and seasonal movements of white sturgeon, 

 Acipenser transmontanus, in the mid-Columbia River. 

 Fish. Bull., U.S. 79:367-370. 

 Haynes, J. M., R. H. Gray, and J. C. Montgomery. 



1978. Seasonal movements of white sturgeon (Acipenser 

 transmontanus) in the mid-Columbia River. Trans. 

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 Hubbs, C. L., and K. F. Lagler. 



1958. Fishes of the Great Lakes region. Revised ed. 

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 Morrison, D. F. 



1976. Multivariate statistical methods. 2d ed. 

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 Scott, W. B., and E. J. Crossman. 



1973. Freshwater fishes of Canada. Fish. Res. Board 

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 Semakula, S. N. 



1963. The age and growth of the white sturgeon (Acipen- 

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