MODIFICATION OF THE BEHAVIOR OF FISHES 



21 



In general the fishes were found by other criteria to be most 

 sensitive to high carbon dioxide in boiled water, to high carbon 

 dioxide in tap water, and to boiled water (low oxygen). It will 

 be noted that the fishes showed modification with fewest trials 

 of the type of water to which they are generally most sensitive. 

 There are several exceptions to this, but the averages of all the 

 species show this very clearly. 



TABLE 4 

 Showing the speed of modification due to different conditions 



