100 DESCRIPTION OF IMPORTANT FISHERIES AND THEIR PRODUCTS 



corn oils are now used almost exclusively. Most imported tuna is packed 

 in water and sometimes has a firmer texture than the oil packs. 



Optional flavorings and seasonings are listed. Of these, the most gen- 

 erally used is a vegetable broth which is usually prepared by the hot- 

 water extraction of dehydrated vegetables. 



Section 37.3 refers to the standard of fill for various size cans. In the 

 case of tuna, the drained weight provides an unreliable index of the 



Figure 7.6. Tuna cleaning operation. (Westgate-California Corporation.) 



original fish fill, and so the official test uses pressed weight. The method 

 consists of pressing the contents of each of 24 cans of the lot under test 

 to remove "free" liquid. A special hydraulic press, plunger, and cup are 

 used, following a carefully defined routine. The press cakes so formed 

 are weighed, and the average must not fall below a minimum specified 

 for the particular can size and pack form being examined. 



Tuna Products. Various tuna products have been marketed from time 

 to time, but none have been highly successful. Only a few, such as canned 

 tuna and noodles and frozen tuna pies, have maintained a high enough 



