182 



MARINE PRODUCTS OF COMMERCE 



Norwegian herring and Hudson River shad, except that there were no periods 

 of consistently low catches followed by catches even higher than formerly. 

 Returning to the marine pelagic species we find the matter of fluctuations 



I860 1870 1880 1890 1300 19 10 193 1930 1940 1950 



looor 



800' 



^600 



Fig. 11-1. Annual catches 

 of some important fisheries 

 (broken lines indicate miss- 

 ing data). 



1660 1870 1880 1890 1900 1910 1920 1930 1940 1950 



again very clearly illustrated in the catch of the Pacific pilchard or sardine 

 (Fig. 11-1) . This fishery was given its first great impetus by the demand for jish oil 

 during World War I, and its significant history begins in 1916. Again there was 

 a period of very great expansion, culminating in the high level of about 800,000 

 tons in the 1936-37 season. Then there followed some very moderate fluctuations 



