ELECTRIC FISH SCREEN 



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6. When swimming into an electrified area fish do have a sense of the direction 

 of danger and try to avoid it. 



7. To be effective, an electric screen must have the lines of current flow perpen- 

 dicular to the plane of the protected opening and the equipotential surfaces parallel 



FlQ. 21 



with this plane. The lines of electric-current flow must also be parallel with the 

 direction of stream flow. 



8. The experimental electric fish screens have been very successful. Actual 

 stream installations should now be made, carefully observed, and developed. 



