of the Salmon in Fresh Water. S7 



5. The solids in the fish of standard length undergo no alteration 

 in the estuary fish from May to August, but in October and 

 November there is a marked decrease. 



In the upper-water fish there is practically no change till August, 

 but there is a very marked diminution in October and November. 



(b) OVARIES. 



1. From May to August the percentage of solids is higher in the 

 fish from the upper reaches than in those from the mouth of the 

 rivers. In October and November the ovaries of fish at the mouth 

 have as high a percentage of solids as those in the upper waters. 



2. Throughout the season the total solids of the ovaries in the fish 

 of standard length are very markedly less in fish at the mouth 

 than in fish in the upper waters. 



From these tables a balance of Loss of Muscle and (Tain of Ovaries 

 may be struck : 



A. Balance to 



Average solids of muscle per fish of standard length in 



estuary fish from May to August, - - 2240 



Average solids in muscle per fish of standard length of 



upper- water fish in July and August, 1 690 



Loss, 550 



Average solids per fish of standard length in ovaries of 



estuary fish from May to August, - 59 



Average solids in ovaries in upper -water fish in July and 



August, 168 



Gain, 109 



If 109 of muscle solids go to ovaries, then 441 grms. will be avail- 

 able as a source of energy. 



B. Balance to November. 



Solids in muscle of estuary fish, May to August, - 2240 



Solids in muscle of upper-water fish, October and 



November, - 880 



Loss, 1360 



Solids in ovaries of estuary fish, May to August, 59 



Solids in ovaries of upper-water fish, October and Nov- 

 ember, 800 



Gain, 741 



If 741 of solids of muscle go to ovaries, 619 will be available as a 

 .source of energy. 



The amount of solids lost by the muscle is not only amply sufficient to 

 yield the solids gained by the ovary, but a large surplus is left. 



