and Brockway (19U8), these fish, during the sixth bi-weekly period, 

 were receiving insufficient amounts of both thiamin and niacin to 

 maintain maximum storage in the livers. Neither the work of Phillips 

 and Brockway (19U8) nor that of McLaren et. al. (19U7) make it pos- 

 sible to determine whether the amount supplied was below the minimal 

 requirements of the fish for these Vitamins „ 



The composition of salmon viscera is not stable. Viscera secured 

 during the forepart of a season will contain a smaller percentage of 

 eggs and milt than will that obtained during the later portion when the 

 sexual products are more fully developed. It will be noted that the 

 proportionally greater gains made by the fish fed high levels of salmon 

 viscera used in these feeding trials was procured from a late run of 

 fall chinook of the Columbia River in which the sexual products were 

 well developed. Later experiments did not utilize salmon viscera in 

 which sexually maturity was as far advanced. It is believed that the 

 preponderance of sexual products in the salmon viscera used during the 

 19hk- feeding trials is responsible for the proportionally greater gains 

 made by the viscera-fed fish during these experiments. 



A comparison was made between salmon viscera collected in Alaska 

 and that derived from the Columbia River during the 19i|8 feeding trials. 

 Two additional variables, different species and probably different stages 

 in the maturity of the viscera, were present in this experiment. The 

 Alaska salmon viscera was secured from pink salmon (0« gorbuscha ) col- 

 lected from Southeastern Alaska under conditions as described by Dassow 

 (19U8)» The Columbia River salmon viscera was collected on a commercial 

 basis as part of the production supply and consisted principally of the 

 viscera of chinook salmon. No comparisons were made as to the proportions 

 of sexual products contained in either lot. Under the conditions of this 



experiment no difference was demonstrated to exist between salmon viscera 

 derived from Alaska or the Columbia River (Table i|, Diets 1$ and 16) . 



The growth potential of salmon viscera excels that of any other 

 product tested in these feeding trials. In every instance the addition 

 of salmon viscera to a diet at levels of 30 per cent or over resulted 

 in. an acceleration of the growth rate over and above that which could 

 be attributed to the other diet components. 



^almon viscera contains the anti-anemic factor in amounts suf- 

 ficient to maintain blueback salmon when fed at levels of 90 per cent 

 or more in the diet, Such a ration will maintain the fish for a 2 it- 

 week period with no symptoms of an amemia (Table 5, ^iets 15 and 16) „ 

 The amount of the anti-anemic factor contained in salmon viscera, 



17 



