ANNUAL REPORT, 1935-36 



19 



The fish mixture referred to was a mixture of equal weights of the flesh of the 

 common sucker and ling. In the case of the alewife and gizzard shad, the entire 

 fish was ground up. 



Each unit of each group was fed the same weight of food and the amount fed 

 was regulated in such a way that a minimum of uneaten particles was left on the 

 bottom of the tank or troughs. Since there is no accurate way of measuring this 

 waste food and since it was fairly uniform in each unit of each group, it was not 

 included in the calculations. 



At regular intervals the fish were weighed and the weight increase for that 

 period was obtained. From this, the increase in weight for 100 fish could be 



