60 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Variability in the reproductive potential of 

 spawning stocks was shown to be attributable to 

 at least 4 factoi-s: (1) biological differences in 

 fecundity between fish of the same size, (2) change 

 in the life-history composition of spawning stocks, 

 (3) differences in sex ratios between life-histoi-y 

 categories, and (4) seasonal differences in repro- 

 ductive ix>tential evidenced from the well defined 

 pattern of occurrence by life-history categories at 

 Karluk Lake. 



The possibility of the commercial fishery being 

 concentrated on the most fecund life-history cate- 

 gories is theorized as a contributing factor to the 

 declines in red salmon runs over the past several 

 decades. 



LITERATURE CITED 



Barnaby, Joseph T. 



19-14. Fluctuations in abundance of red .salmon, Oiicor- 

 hynchux »erka (Wall)a\im), of tlie Karluk River, 

 Alaska. Fishery Bullrtiu, U.S. Fish and Wildlife 

 Service, vol. r,0. No. 3!), i.ii. 2.37-29.">. 

 Brown, C. J. D., and (Jertri'de C. Kamp. 

 1912. Gonad measurements and egg counts of brown 

 trout (Salmo trutta) from the Madison River, Mon- 

 tana. Transactions of the American Fisheries Soci- 

 ety, vol, 71, iip. 19.V200. 

 Chamberlain, F. M. 



1907. Some observations on salnmu and trout in 

 Ala.ska. Report Conuuissioner of Fisheries for 1900. 

 Bureau of Fisheries Document 027, 112 pp. 



FoERSTER, R. Earle, and Andrew L. Pritchard. 

 1941. Observations on the relation of egg content to 

 total lengtli and weight in the smkeye salmon (0»- 

 rorhyncli IIS iicrka) and the pink salmon (0. gor- 

 biischa). Transaction Royal Society of Canada 3~>. 

 sec. V:51-60. 



Gilbert. Charles II., and Willis H. Rich. 



1927. Investigations concerning the red-salmon runsi 

 to the Karluk River, Alaska. Bulletin U. S. Bureau 

 of Fisheries, vol. 4.3, pt. 2, i)p. l-(>9. 



Xelson, Philip R. 

 19.19. Effects of fertilizing Bare Lake, Alaska, on 

 growth and production of red salmon ( O. iicrka). 

 Fishery Bulletin, U.S. Fish and Wildlife Senice, vol, 

 60, No. 1.59, pp. .59-86. 



Ricker, William E. 



1932. Studies of speckled trout { SaJreliniis fonthinliK) 

 in Ontario. Publications Ontario Fisheries Research 

 Laboratory, No. 44, pp. G7-110. In University of To- 

 ronto Studies, Biol. Ser. No. .36. 



Rounsefell, George A. 



1957. Fecundity of North American Salmonidae. 

 Fishery Bulletin, U.S. Fish and Wildlife Service, vol. 

 .57, No. 122, pp. 451-468. 



19.5S. Factors causing decline in sockeye salmon of 

 Karluk River, Alaska. Fishery Bulletin, U.S. Fish 

 and Wildlife Service, vol. .58, No. 130, pp. 83-169. 

 U.S. Fish and Wildlife Service. 



1958. Progress report on Ala.ska fisheries management 

 and research for 1957. U.S. Fish and Wildlife Serv- 

 ice, Si>ecial Scientific Report-Fisheries No. 25S, 22 

 pp. 



WlTHLER, F. C. 



19.50. Egg content of Babine sockeye. Fisheries Re- 

 search Board of Canada, Progress Reports, Pacific 

 Coast Station, No. 82, pp. 16-17. 



o 



