WISCONSIN {Cont. ) 

 University of Wisconsin 



1. Studies on Movements and Concentrations of Fishes by Sonic Methods. 



The project objectives are to study the movement and concentrations of 

 fishes through the use of a modified echo sounder, a special oscilloscope attach- 

 ment. Also, divers equipped with underwater lights and throat microphones 

 aid in the observations. 



Lake Mendota; began 1950, to close 1954; $4, 600; Arthur D. Hasler, J. J. 

 Tibbies, Leaders; reports available. 



Address inquiries to: Dr. Arthur D. Hasler, Birge Hall, University of 

 Wisconsin, Madison, Wis. 



2. Introductory Study of the White Bass, Lepibenna chrysops, in Lake Mendota. 



The principal objectives are to obtain information concerning the growth 

 rates, food habits, and schooling behavior of the white bass, primarily concen- 

 trating the effort in the Second Point and Picnic Point regions. Because the 

 activities of white bass can be observed directly from a boat, distribution of 

 >white bass is followed by observation of surface schooling. Also echo-sounding 

 from the launch O. N. R. Impulse indicated a possible source of information 

 on sub-surface school movements of the white bass. 



Lake Mendota; began 1953, to close 1955; $2,000; Arthur D. Hasler, Ross M. 

 Horrall, Leaders. 



Address inquiries to: Arthur D. Hasler, as in No. 1 above. 



3. Orientation of Fishes to Odors. 



On the hypothesis that salmon return to their home streams to which they 

 have been previously conditioned by the odors inherent in that stream, work is 

 continuing to determine the various aspects of the orientation of fishes to odors. 



Hdqrs. University of Wisconsin; began 1948, continuing; $6,000; Arthur D. 

 Hasler and W. J. Wisby, Leaders; reports available. 



Address inquiries to: Arthur D. Hasler, as in No. 1 above. 



4. Trout Productio-i in Alkalized Bog Lakes. 



Objective of the project is to determine production of trout in bog lakes 

 where transparency has been improved by alkalization with lime; production is 

 measured at varying levels of stocking. Standing crops of plankton and pro- 

 duction of trout have been measured on these lakes in which one has been alka- 

 lized and one left in the natural state. 



Vilas County; began 1952, to close 1955; $2,500; Arthur D. Hasler, W. E. 

 Johnson, Leaders; reports available. 



Address inquiries to: Arthur D. Hasler, as in No. 1 above. 



5. Hastening Spawning in Cyprinid Fishes With Pituitary Hormones. 



The objective of the project is to develop an assay method for measuring 

 the minimum quantity of pituitary hormone necessary to induce spawning in 

 cyprinid fishes. Particular attention is given to the refinement of techniques 

 in the use of the hormone for producing spawning in freshwater pond fishes. 

 This technique will be employed in India where, at the present time, the fish 

 stocks are undependable due to the unreliability of the rains which induce spawn- 

 ing naturally. 



Ford Foundation Cooperating; Hdqrs. University of Wisconsin; began 1953, 

 to close 1954; $500; Arthur D. Hasler, L. S. Ramaswami, Leaders; reports 

 available. 



Address inquiries to: Arthur D. Hasler, as in No. 1 above. 



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