442 



TJ. S. BUREAU OF FISHERIES 



value in furnishing this element to animals. The importance of the 

 meal for this purpose would depend largely upon whether or not the 

 iodine contained in it were concentrated in the animal flesh used for 

 human nutrition, A number of analyses of fish meals from different 

 sources were made with the idea of getting some information as to 

 their iodine content. 



EXPERIMENTS 



In this work the same process as that employed in the analyses of 

 fresh fish was used, namely, a modification of Von Fellenberg's 

 extraction method. A description of the procedure is to be found in 

 the previous paper. The samples were taken (in the case of salt and 

 smoked fish) by cutting all of the edible portion from one or two fish, 

 chopping the material very finely, mixing well, and then weighing 

 immediately a 50 or 75 gram sample. In the case of canned fish the 

 sample was, as a rule, taken from but one can, although in some 

 instances two or three cans were used. The contents were finely 

 chopped, thoroughly mixed, and samples weighed as above. From 

 this point the procedure described in the previous report was followed. 

 For the fish meals a 25 or SOgramsample was weighed, dried to constant 

 weight and the regular method followed. Results of the analyses 

 of the edible foods are given in Table 1, calculated on both a wet and 

 a water-free basis. The analyses of fish meals are shown in Table 2. 

 In order that a comparison may be made more easily, there is shown in 

 Table 3, the iodine content of fresh fish, preserved sea foods, and other 

 common foods. 



Table 1. — Iodine content of preserved sea foods 



Kind of preserved sea food 



Canned: 



Albacore -- 



Clams, minced (New England) 



Codfish cakes -. 



Codfish, shredded 



Crab meat, Japanese 



Finnan haddie 



Lobster 



Mussels, sea — 



Meat 



Liquor in can 



Oysters- 

 Meat 



Liquor in can 



Roe- 

 Codfish 



Codfish, buck 



Herring 



Shad._ 



Salmon, chinook 



Sardines- 

 California. 



Maine 



Shrimp 



Tuna, bluefln 



Salted: 



Cod- 



Haddock 



Herring — 



M ackerel (common) 



Mullet -- 



Smoked: Herring 



Mild cured: Chinook salmon 



