AVOIDANCE RESPONSE OF THE COMMON SHINER TO CHLORINE 833 



75 



50 — 



25 



TRC TRIALS 



• •12C 



O- -O 24 C 



o 



-z. 



LLI 

 Q 



CO 

 LU 



75 



50 



25 



(b) _ 



CRC TRIALS 

 » % 12"C 



O- -O 24 C 



AT 0.025 0.050 0.100 



CONCENTRATION, mg/liter 



0.200 



0.400 



Fig. 2 Residence time and first significant avoidance (P<0.05), 

 indicated by an asterisk (*), of the common shiner to several 

 concentrations of (a) total residual chlorine (TRC) and (b)chlora- 

 mine (CRC) at preferred (AT) temperature conditions vv^hen accli- 

 mated at 12 and 24°C. 



was attained (0.10 mg/liter TRC or 0.20 mg/liter CRC), depending 

 on the acclimation temperature (Fig. 1). As these levels increased in 

 magnitude, the shiner showed greater avoidance behavior, with as 

 low as 6.4% residence time at 18°C for 0.40 mg/liter TRC. Cherry et 

 al. (1977) reported similar avoidance trends to TRC (0.05 to 



