CONTENTS 



Page 



Introduction 1 



Study area 2 



Equipment 2 



Trawl 2 



Electrode arrays 2 



Electrical shocker 2 



Physical quality of water 3 



Conductivity 3 



Temperature 3 



Method of testing the electrical trawl 3 



Results of testing the electrical trawl 3 



Catch rates 3 



Gear selectiveness 6 



Species composition 6 



Length-frequency distribution 7 



Summary and recommendations 8 



Literature cited 10 



Figures 



No. Page 



1. Diagram of electrical trawl showing basic electrode arrays 2 



2. Block diagram of fish shocker and allied equipment 3 



3. Alewife length-frequency distribution with electrode array 1. . . 7 



4. Alewife length-frequency distribution with electrode array 2. . . 7 



5. Alewife length-frequency distribution with electrode array 3. . . 7 



6. Alewife length-frequency distribution with electrode arrays 1, 



2, and 3 combined 8 



7. Chub length-frequency distribution with electrode array 1 8 



8. Chub length-frequency distribution with electrode array 2 9 



9. Chub length-frequency distribution with electrode array 3 9 



10. Chub length-frequency distribution with electrode arrays 1, 2, 



and 3 combined 9 



11. Yellow perch length-frequency distribution with electrode ar- 



ray 2 9 



in 



