Parasites are considered unimport- 

 ant as a natural control of the lamprey. 



1957. Tlie control of the upstream move- 

 ment of fish witli pulsated direct 

 current. Trans. Am. Fish. Soc, 

 Vol. 86 (1956), pp. 269-2 84. 

 Alternating-current barriers placed 

 in streams to block spawning runs of 

 sea lampreys in some situations 

 cause heavy mortalities of useful fish. 

 To reduce this loss a direct -current 

 diversion device is placed down- 

 stream. This equipment is described 

 and the circuitry is illustrated. Most 

 significant featiire is the introduction 

 of the negative field into the stream . 

 Fish are turned away from the alter- 

 nating-current field and diverted into 

 a trap. Two devices tested over an 

 entire season gave excellent results. 



McLain, AlbertonL., and Willis L. Nielsen 

 1953. Directing the movement of fish 



with electricity. Fish and Wild- 

 life Serv., Spec. Sci. Rep. --Fish. 

 No. 93, 24 pp. 

 Description of equipment, procedure, 

 and results in laboratory and field 

 experiments (mostly with brook trout, 

 rainbow trout, and white suckers). 

 Best results were obtained with square 

 wave shape at a duty cycle of 0.66, 

 frequency of 3 per second. Variation 

 of reaction according to size of fish 

 was a major difficulty. Technical 

 problems are reviewed and recom- 

 mendations made for further research. 



Moffett, James W. 



1950. Progress report on the sea lamprey 



program. The Fisherman, Vol.18, 



No . 7, pp . 5 and 8 . 

 Outline of organization of the expanded 

 Great Lakes Fishery Investigations, 

 account of works in progress, and 

 statement of proposed researches on 

 the development of methods of con- 

 trolling the sea lamprey. 



1950. Sea lamprey control. Mich. Cons,, 

 Vol. 19, No. 4, pp. 18-20. 



Popular review of the subject empha- 

 sizing the use of known facts in the 

 life history of the sea lamprey in the 

 technical problem of developing methods 

 of control by mechanical barriers, 

 electricity, poisons, and other means. 



1952. The study and interpretation of fish 

 scales. The Science Counselor, 

 Vol. 15, No. 2, pp. 40-42. 



Popular account touching such points 

 as: structure of scales; development 

 of the use of scales and bones for 

 growth studies; preparation and micro- 

 scopic examination of scales and scale 

 impressions; practical applications of 

 growth data. 



1953. Report of Committee on Hydrobiology 

 and Fish Culture. Trans. Am. Fish. 

 Soc, Vol. 82(1952), pp. 315-320. 



Major impediments to effective re- 

 search include: a poor "research clim- 

 ate", inherent in our very culture; 

 superficiality of training; a mania for 

 action programs which demand quick 

 results, and give no opportunity for 

 mature consideration: diversion of 

 best researchers into administration. 

 Suggestions are given for the correction 

 of these evils . 



1953. Lake fisheries need lamprey control 

 and research. The Fisherman, 

 Vol. 21, No. 4, pp. 10-11 and 14. 

 The invasion of the sea lamprey, its 

 destruction of lake trout in Lakes Huron 

 and Michigan, and its threat to Lake 

 Superior are reviewed. Control of 

 lampreys is imperative if fisheries are 

 to be spared in Lake Superior and re- 

 stored in Huron and Michigan . Yet, 

 control is not enough. We must have a 

 greatly expanded and continuing research 

 program to learn the factors of abun- 

 dance of fish. Certain specific research 

 problems are listed. 



1953. War on lampreys. The Philadelphia 

 Enquirer, Aug. 23. 

 Popular account of the invasion of the 

 sea lamprey, its threat to the fisheries, 

 and steps taken to meet that threat. 



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