The average catch for the eleven years, given above, 



we find to be 581,357; the average catch of the first live 



years was 637,800, and during the next five years this 



average was reduced to 518,200. This average, although 



a decrease from the average of the preceding five years, 



was considerably increased by the comparatively large 

 catch of the spring of 1871) — tlie first year that the pro- 

 duct of artificial propagation was materially felt. 



If we eliminate the catch of this year and take the 

 average of the four preceding years — that is 1875, '76, 

 '77 and '78 — we have an average yield for those years of 

 402,600, but the catch of 1880 was 614,929, an increase of 

 33,572 over the average catch for the wdiole eleven years, 

 and an increase of 96,729 over the average for the five 

 preceding years, including the year 1879, and 212,329 

 over the average of the four years immediately preced- 

 ing the return of the fish produced by artificial means. 



statement shoioing amount of flsli sold in Wasliington 

 and Alexandria fr om 1865 to 1880 inclusive. 











No. Shad. 







A^TTA R 

















Alexandria. 

 224,096 



Washington, 

 ""530,2(X)"~" 



Total. 





1866. 





754,296 





1867. 





777,775 



350,420 



1,128,195 





1868. 





714,625 



230,151 



944,776 





1869. 





417,878 



277,125 



695,003 





1870. 





301,137 



527,140 



828,277 





1871. 





333,516 



401,132 



734,648 





1872. 





367,322 



464,136 



831,458 





1873. 





289,729 



852,900 



1,142,629 





1874. 





325,340 



628,637 



953,977 





1875. 





243,643 



464,215 



707,858 





1876. 





237,096 



319,079 



556,175 





1877. 





85,562 



131,199 



216,761 





1878. 





45,138 



121,785 



166,923 





1879. 





77,809 



327,537 



405,346 





1880. 





134,081 



421,041 



555,122 



lV)tal 



— 15 years 









10,621,444 



Avert 



,ge per year for 



15 years 





708,096 



u 



66-70—5 



yrs. 







870,109 



u 



71-75--5 



yrs. 







874,114 



u 



76-80—5 



yrs. 







380,0()5 



