IOWA (Cont. ) 



10. Factors Affecting Smallmouth Bass Production in Northeastern Iowa Streams. 



This project involves a multi-phase study of the life history and ecology of the 

 smallmouth bass in 17 test streams in the area. Data is gathered annually 

 on the nests seen per mile, condition and location of nests, effect of changed 

 environment, effect of stream flow, turbidity, number of fingerlings per 500 

 feet of seining, age and growth data, quantitative bottom favina. Tied in with 

 this are observations on the effect of climatic factors such as temperature 

 and rainfall. Effort is also being made to correlate good and poor natural 

 hatches with age and survival data on minnows to attempt to discover forage 

 indicator species which will give accurate insights into annual reproduction 

 success of the smiallmouth bass. 



Began May 1949, continuing; $2,000; R. E. Cleary, Project Leader. 

 Address correspondence to: E. B. Speaker, Supt. of Biology, Iowa Conserva- 

 tion Commission, 7th and Court Sts. , Des Moines, Iowa. 



11. Modified Voluntary Creel Census - Northeastern Iowa Streams. 



This project was started to give an insight into the per hour take of especially 

 picked anglers who are deemed "experts" and who fish primarily in the flow- 

 ing waters of northeastern Iowa. The contacts are picked on a fixed ratio 

 from each county and serve to furnish us with season catch di_ta on a weekly 

 report basis. Their data indicate a measure of the available crop, season 

 take, selectivity of stream and species, and to correlate against test netting 

 results. 



Streams of northeastern Iowa; began April 1950, continuing; $1,000; R. E. 

 Cleary, Project Leader; data in quarterly biology reports. 



Address correspondence to: E. B. Speaker, Supt. of Biology, Iowa Conserva- 

 tion Commission, East 7th and Court Sts. , Des Moines, Iowa. 



12. Creel Census. 



Principal objective of this project is to determine success in the majcr fishing 

 lakes of Iowa. Annual sampling of anglers is conducted from May 15 to July 1, 

 on seven lakes in northern Iowa. One clerk is employed for each lake. He 

 contacts shore, dock, and some boat fishermen collecting information on their 

 catches and amount of time spent in angling. Some voluntary reports by 

 cooperating boat lines are incorporated in the census. Comparisons of tabu- 

 lated total catch by species and unit effort are made from season to seasom 

 to indicate trends and evaluate management practices. 



Northern Iowa Lakes (Spirit, East and West Okoboji, Lost Island, Storm, Clear 

 and Blackhawk); began May 1946, continuing; $2,000; Earl T. Rose, Project 

 Leader, some reports available. 



Address correspondence to: E. B. Speaker, Supt. of Biology, Iowa Conservation 

 Commission, East 7th and Court Sts. , Des Moines, Iowa. 



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