be pointed out that its pulse width is fixed at 1 

 msec cuid its pulse shape is also fixed. These 

 were designed into the system after we made a 

 study of capacitator-discharge pulse generators. 

 If time and funds were available, these two fixed 

 characteristics could be redesigned for flex- 

 ibility. 



In designing a follow-up FFEM, a consid- 

 erable savings can be realized through the use of 

 polyvinal chloride pipe in place of the high 

 impact aluminum tube. In addition, for a 

 commercial application the system could be 

 designed without the sophistication and versa- 

 tility of our prototype thus realizing a 

 considerable savings. The catch rate of the 

 electrical trawl possibly could have been 

 increased with a more homogeneous electrical 

 field and/or more power to the array system 

 during our field tests. 



ACKNOWLEDGMENT 



The authors wish to thank the National 

 Marine Fisheries Service, Remote Sensing Group 

 under the direction of Bill Stevenson for their 

 invaluable assistance with the electronic 

 circuitry . 



LITERATURE CITED 



ELLIS, J. E. 



1972. The use of electricity in conjunction with a 

 12.5-meter (headrope) Gulf-of-Mexico shrimp trawl 

 in Lake Michigan. NOAA Tech. Rep. NMFS 

 SSRF653, 10 p. 



ELLIS, J. E., and E. N. PICKERING. 



In press. The catching efficiencies of a 21.3-meter 

 (headrope) standard wing trawl and a 21.3-meter 

 electrical wing trawl in the Saginaw Bay area of 

 Lake Huron. Trans. Am. Fish. Soc. 



KREUTZER, C. O. 



1964. Utilization of fish reaction to electricity in 

 sea fishing. In Modern Fishing Gear of the World 

 2, p. 545-551. Fishing News (Books) Ltd., Lon- 

 don. 



McRAE, E. D., JR., and L. E. FRENCH, JR. 



1965. An experiment in electrical fishing with an 

 electric field used as an adjunct to an otter-trawl 

 net. Commer. Fish. Rev. 27(6): 1-11. 



SEIDEL, W. R. 



1969. Design, construction, and field testing of the 

 BCF electric shrimp-trawl system. U.S. Fish 

 Wildl. Serv., Fish. Ind. Res. 4:213-231. 



SHENTAYKOV, V. A. 



1965. On the possibilities of electric fishing in large 



bodies of water. [In Russian.] Rybn. Khoz. 



41(2):53-57. 

 VILBERT, R. 



1970. Fishing with electricity: its application to 

 biology and management. Int. Mar. Publ. Co., 

 Camden, Maine, 304 p. 



^GPO 796.147 



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