most important food substances. The other lot was fed on canned 

 salmon for four days and on the mixture of ground salmon eggs and 

 middlings for three days alternately. This was deemed sufficient to 

 determine whether cold storage salmon eggs would prevent the 

 "deficiency diseases." 



Both lots grew at about equal rates and nothing out of the ordi- 

 nary was observed until June 11, when some of the fry which had 

 received canned salmon only assumed a vertical or semi-vertical 

 position, elevating the heads out of water. On June 14 one of this 

 lot died. No further deaths occurred until June 21, when the 

 experiment had to be terminated. But fungus developed on more 

 than half of them, while those that were still apparently healthy had 

 frayed pectoral fins. The abnormal behavior persisted throughout. 

 The other lot which had received as part of its rations the salmon 

 eggs and wheat middlings mixture were all in perfect condition when 

 the experiment was terminated. 



Quantitative experiments were undertaken to determine the 

 efficiency of salmon eggs as a flesh producer or growth-promoting 

 food. Troughs of the same size as in the experiment already de- 

 scribed were used with the same flow of water. And the space to 

 which each lot was confined was of the same dimensions. At the 

 beginning and end of each experiment, the fry were weighed in 

 water on regular laboratory balances, according to the method 

 employed by Embody. In all cases about 20 hours elapsed between 

 the time of the last feeding and weighing. Each lot was fed twice 

 daily. To eliminate waste, the fry were taught to take the food as 

 soon as it reached the water. By means of a pin, pieces sufficiently 

 small for one "bite" were carved out and dropped into the trough. 

 Fifty chinook salmon fry and 100 chum salmon fry were used in 

 each experiment, lasting seven days. In all 24 experiments were 

 completed over a period of 49 days, the most important results of 

 which will be found in the following table: 



Results of Quantitative Expeeiments with Salmon Eggs as Food 



FOR Young Fish 



84 



