REACTIONS OF FISHES TO SALTS 



263 



run to determine the effect of the starvation upon the reaction 

 to CaCl2. It will be recalled that normal rock bass are negative 

 to this salt in O.OIN concentration (except in the case of large 

 fishes). The starving rock bass were therefore experimented 

 upon in gradients of CaCl2 at different stages of starvation, with 

 results such as those shown in table 4. This table shows that 

 starvation increases the percent of positiveness of these fishes. 

 This is true for that period of starvation, during which the rate 

 of metabolism is slow^ed up. The few experiments that were 

 performed upon fishes in which the factors inhibiting starvation 

 had broken down and the rate of metabolism had gone above 

 normal, indicate that the fishes are again negative to Ca salts 

 at this time. 



TABLE 4 



Showing the reactions of normal and starved rock bass {Ambloplites rupestris) to 

 .OIN concentrations of CaCh in a gradient. Reactions are shown in per cent of 

 time spent in the two halves of the gradient tank 



