70 



BULLETIN OF THE BUREAU OF FISHERIES 



merely chance coincidences. Certainly such considerations could not be made the 

 basis for any prophecy, but they have seemed worthy of recording. 



OTHER SPECIES 



For several reasons we have not thought it desirable at this time to attempt a 

 detailed analysis of the data pertaining to the catches of pinks, chums, cohos, and 

 king salmon in Bristol Bay. These species are all of minor importance in this region, 

 and we have some reason to suppose that the records are less reliable. We will 

 confine ourselves, therefore, to the brief mention of a few interesting points that 



FiQ. 9.— Catch of pinks, cobos, cbams, and kings at Nusbagak 



have developed from the limited study we have made. The data for the Nushagak 

 district are presented graphically in Figure 9 and for Kvichak in Figure 10. The 

 catches of all these species at Egegik and Ugaskik and the catch of cohos at Kvichak 

 have been so small and irregular that the data do not lend themselves to analysis, 

 and therefore they have not been included. 



Our procedure in the analysis of the catch of pink salmon has been affected by 

 the fact that, to the best of our knowledge, these are always 2-year fish; that is to 

 say, they always return to spawn at the end of their second year. On this account 

 the fish running in the odd years are quite independent of those running in the even 

 years, and vice versa. The two-year cycle in the pink salmon is so well known that 

 this subject need not be enlarged upon here. We have calcvdated separate trends 



