IOWA (Cont. ) 



Southern Iowa; May 1956, continuing; $2000; James Mayhew and C. L. 

 King, Leaders. 



Address inquiries to: E. B. Speaker, as in No. 7 above. 



20. Stream Creel Census 



Two creel censuses are taken in Iowa streams to determine the catch per 

 hour of effort, species composition, and seasonal success of anglers. One 

 census employes the use of "expert" voluntary anglers who fish primarily in 

 waters of northeast Iowa, and the second is a form of spot survey taken at 

 random intervals with departmental help on the Des Moines River and its major 

 tributaries. 



Began April 1950, continuing; $1500; R. E. Cleary and H. M. Harrison, 

 Leaders; reports available. 



Address inquiries to: E. B. Speaker, as in No. 7 above. 



21. Winter Dissolved Oxygen Studies 



The objective is to determine whether shallow lakes and streams should 

 be open to promiscuous fishing. Dissolved oxygen samples are taken at regu- 

 lar intervals throughout the winter nnonths on lakes and streams where fish 

 populations are in danger of s-affocation. When oxygen drops to near the 

 lethal point, these areas are open to the public for promiscuous fishing to 

 salvage the fish by spears, dip-nets, and other devices. 



Began 1956, indefinite; $3500; K. M. Madden and E. B. Speaker, Leaders. 



Address inquiries to: E. B. Speaker, as in No. 7 above. 



Iowa State College 



Effects of Flood and Drought on Fish in an Intermittent Stream 



Several species of fishes survive in intermittent streams. The present 



study was undertaken to determine where and how these fish survive the 



critical flood and drought periods. Methods of sampling these fish populations 



are being studied. 



Iowa State Conservation Commission and U. S. Fish and Wildlife Service 



cooperating; Squaw Creek; began September 1953, closed July 1956; $2500; 



Kenneth D. Carlander and Andreas A. Paloumpis, Leaders; reports available. 

 Address inquiries to: Kenneth D. Carlander, Department of Zoology and 



Entomology, Iowa State College, Ames, Iowa. 



Populations and Movements of Channel and Flathead Catfish in Des Moines 

 River, Boone County 



In an attempt to get better methods of determining population abundance, 

 several hundred channel and flathead catfish have been tagged with a strap tag 

 on the operculum. Fish have been taken with hoop nets, seines, electric 

 shocker, angling, and combined use of electric shocker and trammel nets. 



Iowa State Conservation Commission and U. S. Fish and Wildlife Service 

 cooperating; Boone County; began July 1954, to close March 1957; $2800; 

 Kenneth D. Carlander and R. Jess Muncy, Leaders; reports available. 



Address inquiries to: Kenneth D. Carlander, as in No. 1 above. 



Data on Fish Growth and Biology 



Since fishery literature is so scattered, this project attempts to summarize 

 all growth, length-weight, fecxindity, population density and similar data on 

 freshwater fishes of the United States and Canada and to publish tabular sunn- 

 maries in a Handbook and periodical supplements. 



Iowa State Conservation Commission and U. S. Fish and Wildlife Service 

 cooperating; Ames; began January 1947, indefinite; $800; Kenneth D. Carlander 



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