Biological Survey — Erie-Niagara Watershed 



149 



Table 7. — Effect of Blood Removal upon Common Bullhead (Aytieiurus 



nebulosus) 

 Weight of specimen, 180 grams 



DATE 



Volume 

 removed 



Hemoglobin 

 per cent 



Erythrocytes 

 per cm. 



Erythrocytes 

 vol. per cent 



8/2. 

 8/6. 

 8/13 

 8/23. 



9/14 



80 

 55 

 34 

 36 



1,280,000 



1,000,000 



880,000 



750,000 



Fed considerable amounts of raw liver during this period. 

 I 1.5 I 67 1 1,330,000 1 



19 



24 



Table 8. — Effect of Blood Removal upon Pickerel (Esox lucius). 

 Weight of specimen, 225 grams 



DATE 



8/2... 

 8/3... 

 8/8... 

 8/9... 

 8/13. . 

 8/19.. 

 8/23 . . 

 8/28.. 

 8/31 . . 



Volume 



removed 



cc. 



1 



1.5 



0.5 



1.0 



1.5 



0.6 



1.0 



1.3 



0.8 



Hemoglobin 

 per cent 



58 

 50 

 Lost 

 36 

 33 

 47 

 36 

 33 

 32 



Erythrocytes 

 per cm. 



880,000 

 1,000,000 

 1,260,000 

 850,000 

 790,000 

 760,000 



Erythrocytes 

 vol. per cent 



23 

 15 

 15 

 15 



In conclusion we wish to state that a mere beginning has been 

 made in a vast field of fundamental physiology. Its extension 

 must ultimately reflect in marked improvements in both the quality 

 and quantity of fish that inhabit our streams through improve- 

 ments in both the qualitj^ of the waters and the fish. 



Today we know practically nothing of fish physiology. The 

 poverty of our information is very evident in the field of fish blood. 

 Since the determining factors that decide whether fi.sh can live in 

 a stream reflect immediately in the blood, this very important 

 field must be exploited with the tools of modern biochemistry. 

 After the fundamental information has been acquired, it has an 

 immense field of application in determining which streams are fit 

 for fish life and how depleted streams should be changed for their 

 improvement. 



