Table 2. — Percentage of squawfish that entered "positive" 

 end zone during 7-second test interval. 



Percentage of 

 unshocked fish 



Percentage of 

 once-shocked fish 



To north zone To south zone 



at fre- at fre- 



quency — of quency — of 



2 5 8 12 5 8 



i To north zone To south zone 



at fre- 

 quency — of 



at fre- 

 quency — of 



1/ Frequency in pulses per second. 



pulses per second, the fish reached 

 an electroparalytic state in about 

 one-quarter of a second. Nearly all 

 the fish remained in the middle of 

 the electrode array. 



Analysis of Results 



For each'test, as outlined in 

 "Experimental Procedures," the per- 

 centage of adult squawfish that 

 entered the "positive" end zone of 

 the laboratory experimental area is 

 recorded in table 2. The mean per- 

 centage of the adult squawfish that 

 entered the "positive" end zone for 

 each value of the three variable 

 factors of potential, pulse frequen- 

 cy, and pulse duration is recorded 

 in table 3 for north and south 

 blocks and unshocked and once- 

 shocked fish separately. 



Table 3. — Mean percentage of squawfish that entered the "positive" 

 end zone in north and south blocks for each value of the vari- 

 able factors of potential, pulse frequency, and pulse duration 

 and for once-shocked and unshocked fish separately. Each mean 

 percentage in this table is based on 18 observations. 



10 



