OPERATING THE HATCHERY 



Figure 22.— Production should be determined by weijrhing rather than by volume. 

 (I'hotograiih courtesy of the Minnesota Department of Conservation.) 



V2-Sallon units. When the fish 

 are to be measured, the pail is filled 

 with water to the n/a-gallon level 

 and minnows from a dip net are 



38 



added until the level reaches the 2- 

 gallon mark for half a gallon of 

 Hsh and to the 2i/^-gallon mark for 

 a full gallon. One gallon of min- 



