90 



Investigation* on the Life-History 



This somewhat too limited series of observations indicates 



1 . That the male fish coming to the rivers throughout the season 



have a musculature somewhat poorer in solids than the 

 female fish. 



2. That in the upper reaches the percentage of solids is about the 



same as in the female fish. 



3. That the nature of the change in the percentage of solids is the 



same as in the female fish. 



4. That the testes are considerably poorer in solids than the ovai'ies. 



5. That there is in the testes a more marked increase in the per- 



centage of solids than in the ovaries in October and November. 



6. That in the estuary fish, as regards the amount of solids in the 



muscle per fish of standard length, there is a marked increase 

 in July and August, and a decrease in October and November. 



7. That throughout the season the amount of solids in the muscle 



is smaller in the fish in the upper reaches than in those at the 

 mouths of the rivers, and that the difference becomes more 

 and more marked as the season advances. 



TABLE V. 



Solids of Muscle. 



Estuary. 



May and June, 1809 



July and August, - 2452 



October and November, - I 1470 



Upper Water. 



1774 



1592 



865 



8. That the amount of solids in the testes per fish of standard 

 length steadily increases in fish in the estuaries and in fish in 

 the upper waters throughout the season, and that the in- 

 crease is even greater in the sea than in the upper 

 reaches. But since only one upper-reach fish was examined 

 in October and November, too much stress cannot be placed 

 upon this. 



