modified from a visual readout to an entirely 

 mechanical readout. This method eliminated 

 errors due to possible misalinement of the sam- 

 pler's eye and the millimeter scale, and pro- 

 vided more precise measurements. 



Body lengths were recorded to the nearest 

 millimeter. To determine the average body 

 length of a fish of a certain age, the lengths 

 of all fish of that age were summed, then di- 

 vided by the number of fish in the age class. 

 Before 1954, average body lengths were calcu- 

 lated from data arranged in 5-mm groups. 

 After 1954, the 5-mm arrangement was elim- 

 inated, and average body lengths were obtained 

 by summing the lengths of all fish for each 

 age class. 



Sex by Age 



(Tables 15, 16, 17, and 18) 



Sex was determined for each fish in a sample 

 by visual examination of the gonads. Some 

 difficulty was experienced in determining the 

 sex of juveniles of age I-II, and also the sex 

 of adults during the first few weeks of a fish- 

 ing season because the fish were still spent from 

 spawning. Both of these problems were usu- 

 ally resolved by microscopic examination of the 

 gonads. 



LITERATURE CITED 



DAHLGREN, E. H. 



1936. Further developments in the tagging of 



the Pacific herring (Clupea pallasii) . J. Cons. 

 11: 229-247. 

 DAHLGREN, E. H., and L. N. KOLLOEN. 



1943. Outlook for the Alaska herring fishery in 



1943. U.S. Fish V^ikll. Serv., Fish. Leati. 16, 16 p. 



1944. Outlook for the Alaska herring fishery in 



1944. U.S. Fish Wildl. Serv., Spec. Sci. Rep. 

 Fish. 25, 18 p. 



INTERNATIONAL NORTH PACIFIC FISHERIES 

 COMMISSION. 



1961. The exploitation, scientific investigation and 

 management of herring (Clupea pallasii) on the 

 Pacific coast of North America in relation to the 

 abstention provisions of the North Pacific Fish- 

 eries Convention. Int. N. Pac. Fish. Comm., 

 Bull. 4, 100 p. 

 KOLLOEN, L. N., and C. H. ELLING. 



1948. Outlook for the Alaska herring fishery in 

 1948. U.S. Fish Wildl. Serv., Spec. Sci. Rep. 

 Fish. 52, 23 p. 

 ROUNSEFELL, G. A. 



1930. Contribution to the biology of the Pacific 

 herring {Chipea pallasii) and the condition of 

 the fishery in Alaska. U.S. Bur. Fish., Bull. 45: 

 227-320. 

 ROUNSEFELL, G. A., and E. H. DAHLGREN. 



1935. Races of herring (C/Mpeapa?tesn) in south- 

 eastern Alaska. U.S. Bur. Fish., Bull. 48: 

 119-141. 

 SKUD, B. E. 



1963. Herring tagging experiments in southeast- 

 ern Alaska. U.S. Fish Wildl. Serv., Fish. Bull. 

 63: 19-32. 

 SKUD, B. E., H. M. SAKUDA, and G. M. REID. 

 1960. Statistics of the Alaska herring fishery, 

 1878-1956. U.S. Fish Wildl. Serv., Statist. Dig. 

 48, 21 p. 

 THOMPSON, W. F. 



1917. A contribution to the life history of the 

 Pacific herring: Its bearing on the condition 

 and future of the fishery. Proc. British Co- 

 lumbia Rep., Comm. Fish. 1916, p. 36-87. 



GPO 998-520 



