70 America7i Fisheries Society 



young fish served for the most part as food for the older 

 and larger fishes. 



This pond, from the time it was first stocked, was al- 

 lowed to stand practically undisturbed. Most of the food 

 supply for the fish was produced in the pond. The dense 

 growth of vegetation was not disturbed except that boats 

 were sometimes run through it to open up channels of 

 water. The chara "moss," lilies and other water plants 

 grew to the extent that the surface of the water during 

 part of the summer months was almost a solid mass of 

 vegetable matter. This growth of vegetation so com- 

 pletly covered the surface of the pond that at times only 

 small patches or lanes of water could be seen. On two 

 or three occasions during the hottest part of the summer, 

 the water went down until the deepest basin was not 

 over four or four and one-half feet in depth. This was 

 due to growths of vegetable matter that partly stopped 

 up the water pipes. The pipes were opened as soon as it 

 was discovered that the water was going down in the 

 pond. 



TEMPERATURE OF WATER. 



The temperature of the surface water during the 

 month of August, taken at 8 A. M. and 5 P. M., varied 

 from 70 to 91 degrees Fahrenheit, the usual temperature 

 varying somewhere between 80 and 86. The tempera- 

 ture taken at the bottom of the pond was from one to 

 three degrees lower than at the surface, but never as 

 much as four degrees. The temperature of the air for 

 the same month taken in the shade at 8 A. M. and 5 P. 

 M. ranged from 70 to 95 degrees Fahr., but on a few 

 occasions was over a hundred at some intervening time 

 during the day. 



HOW THE FISH WERE FED. 



The fish in this pond, when fed, were given liver, 

 chopped up fish, corn chop and some small quantities of 

 other kinds of food. They were fed from a platform that 

 was built about fourteen feet from the east shore and 

 near the deepest basin in the pond. A boardwalk led from 



