Discussion of results 93 



Summary 95 



Conclusions 97 



Processing salmon cannery waste for recovery of vitamin A oils.. 98 



Introduction 98 



Collection of raw materials 98 



Equipment used 100 



General procedure for alkali digestion 100 



Variations in procedure for alkali digestion 101 



Determination of oil content and oil yield 102 



Determination of vitamin A in oils 103 



Discussion of results 106 



oummary 107 



Literature cited 107 



ILLUSTRATIONS 



Plate 



1 Salmon Waste Collecting Scow 6l 



2 Grinding Salmon Waste for Hatchery Feed 63 



3 Sorting Cannery Waste 6k 



U Grinding Salmon Waste with Hercules Meat-Bone Chopper for 



Preparation of Hatchery Feed 99 



PART I 

 INTRODUCTION 



This is the first of two parts of a report on utilization of Alaskan 

 salmon cannery waste. The project was carried out under the contract 

 sponsorship of the Industrial Research and Development Division, Office 

 of Technical Services, Department of Commerce. The research grant was 

 made to the Alaska Fisheries Experimental Commission and research was 

 carried out at the Fishery Products Laboratory, Ketchikan, Alaska, and 

 the Fishery Technological Laboratory, Seattle, Washington. 



There has been a considerable interest shown by industry in obtaining 

 reports of the results of this work even before the research is completed. 

 In view of this situation and with several orders for reports and requests 

 to borrow preliminary progress reports having been received, it was de- 

 cided to publish that portion of the work conpleted during the calendar 

 year 1947 as Part 1 of the report and to include additional material in 

 a later part or parts to be published when more research has been com- 

 pleted. The next part of this report, in addition to giving results of 

 research, will contain a detailed introduction giving comprehensive back- 

 groijud of the status of the Alaska salmon cannery waste situation, recom- 

 mendations for future work, and sug-:rested applications of research com- 

 pleted at that time. 



The present report is confined to a very brief introduction followed 

 by a detailed report of the survey made at the start of this investigation 



