lo College of Forestry 



vorous and carnivorous animals, and to show rather precisely 

 the dominance of those feeding upon plants over those feeding 

 upon flesh. This fact gives additional support and emphasis 

 to the importance of the vegetation in the production of fish 

 food. 



Depth of water is another factor of much influence. This 

 investigation shows that the greatest amount of fish food is 

 produced in shallow water of less than six feet, and that, in 

 general, both in number and in kind these animals decline in 

 variety and abundance with increasing depth. 



Provisional estimates were made of the amount of food 

 eaten by fish, in an effort to calculate the quantity of fish food 

 which the bay can nourish. Very little accurate information 

 seems to have been recorded on this subject. This fact empha- 

 sizes in a striking manner the urgent need of careful detailed 

 investigation of the amount of food rec^uired by our common 

 fish in nature per day, how much this varies with age, and 

 with the season. 



All of these observations are of much value scientifically, 

 and in practical fish culture in working out comprehensive 

 plans for the propagation and planting of fish, and for other 

 phases of aquatic management of forest waters. These and 

 other allied investigations now under way at the College of 

 Forestry are to be used in building up a sound body of scien- 

 tific facts on the ecology of fish and game, upon which, in the 

 future, can be erected a better system of management of our 

 forest waters and lands than is possible with our present defec- 

 tive knowledge. Working plans for aquatic management bear 

 the same relation to cultivation of the waters as working plans 

 for fore.^ts have to forest management and game plans to game 

 management, and such plans can only be developed after the 

 proper surveys have been made and all the factors correlated 

 and organized on a practical basis. 



Charles C. Adams, 



Professor of Forest Zoology. 



Department of Forest Zoology. 



