CONTENTS 



Page 



Introduction 1 



Methods 2 



Results 3 



Discussion 9 



Description of technique 11 



Acknowledgment 13 



Literature cited 13 



ABSTRACT 



The micro method of hematocrit is rapidly replacing red cell 

 counts in clinical hematology. Observations were made on the value 

 of this method in routine hematological examination of trouts. Under 

 the conditions of data collection, the normal hematocrit values for brook 

 trout were 45 to 50, for brown trout 39 to 44, and for rainbow trout 45 

 to 53 . There was a close correlation between the hematocrits, red cell 

 counts and hemoglobin. The commercial heparinized capillaries, while 

 excellent for human blood, tend to give somewhat higher readings (7 to 

 18 percent) with trout, due to incomplete prevention of blood coagulation. 

 The procedure as applied to trout is described in detail. 



