The head-collar section may be satisfactorily processed by the alkali 

 disgestion method to prepare a fish body oil of excellait quality, but of 

 negligible vitamin A content. The protein portion of the fish vfaste is not 

 usually recovered as fish meal vrtien the alkali digestion process is employed. 

 The liquified tissue could be re-precipitated, neutralized, and dried, but the 

 denaturation of the protein might be sufficiently severe to limit the uses 

 to which this meal could be put. 



Examples, by species, of the yield of oil and of the vitamin A concen- 

 tration include: 



•'f^^ 



