COCTTENTS 



Page 



Introduction. » .o. - <.» ...... = ........•...... 1 



Eqiiipmerit .. ...,=. o 2 



Methods ..... o . . ..< ... ,,o .... , ^ 



Reactions of different species to piilsated 



direct current, 9 



Laboratory tests on white suckers 9 



Field tests on white suckers 9 



Laboratory tests on brook trout. 10 



Laboratory tests on rainbow trout 12 



Field tests on rainbow trout . , 13 



Laboratory tests on other species 21 



Other laborat ory tests » 21 



Prospects and problems in the application 



of an electrical leading device 21 



Literature cited. ..,...,..,..........•• 2k 



ILLUSTRATIONS 

 Figure Page 



1. Diagram of electrical equipment used in fish leading 

 experiments h 



2. Voltage gradients in volts per inch (expressed as 

 percentage of electrode voltage) obtained between 

 electrodes (distance in inches) in the laboratory 

 test tank, Carp Creek, and the Little Ocqueoc 



River. 6 



3. The electrode array of the DC leading device 



as installed in the Little Ocqueoc River, Presque 



Isle County, Michigan. 7 



1|. The DC power supply and commutator unit of the 



leading device as used for field tests 8 



5. The influence of voltage gradient and duty cycle 

 at a repetition rate of 2 pulses per second on 

 the galvanotaxic reactions of brook trout. Lines 

 betxreen points indicate range of voltage gradient 

 over which the class of reaction was observed 11 



