426 



MMiiNi: rnoiwcTs of commerce 



in S(>v(m;i] lMn()|HMn countries, while salmon and svvordfisli are canned in Japan 

 and alonu; llie coast ol Asia, ('anada eonlril)ntes very largely to the production of 

 canned salmon. 



1921 192b 1930 1935 1940 1946 



(.C'oiiitfsy U. S. Fish Olid ll'Hillifc Scivicf) 



Fic. 20-1. The prodiiclioii ol canned fisherv pn)d)iets, fisli scrap and meal, 

 and fish oil was eonsiderahlv helow normal in lf)lO. Preliminary data indicate 

 that ahont ^57 million pennils ol (ish and shclllish were canned dnring the 

 year I'omparcd with (i U) million ponnds in H)I5 and a 1935-39 average of 690 

 million jionnds. The proilnetion of lish meal amounted to ahont 186,000 tons. 

 Ahoul 2(),0()(),00() gallons of lish and fish liver oils were niamifaetnred in 1946 

 compared with 24,501,852 gallons in the pre\ions year and a 1935-39 average 

 ol 35.7 million <'allons. 



Outline of Canning Methods 



The important steps in the canning of fish and the purpose of each arc briefly 

 dcscrihinl below. 'Vhc procedure necessarily varies considerably with didcrent fish 

 and with diliiMcnt ]-)roducts of the sanu^ lish. A more detailed description of the 

 methods employed is given undcM the particular products covered in this chapter. 



Iloat and Power. In planning a fish cannery it is particularly important that 

 liberal pro\ ision be maile lor power, ('aimers rc(|uirc a supply of steam, not only 

 lor healing or cooking and cleaning purposes, but also lor power. The boiler 

 capacity shouUl bi' nuuh more than sulIiiMi-nt to take care ol the plant when run- 

 ning at lull capaeilN', and it is also desirable to ha\e some reserve in case of break- 

 down. A boili>r that is constantlv rc(|uired to give ser\ice up to the limit of or 

 bevoiul its eapai'il\' is in dangc>r of breaking down, ami the steam supph' is apt to 

 be wet. 



Though steam power is usetl in a lew canneries lor operating mac"hinery, a far 

 great(>r number ol machines arc> now operated with indix idual electric motors. 



