IOWA (Cont.) 



20. Continuing Inventory of the Fishes of Iowa. 



The project involves population trend determinations by netting surveys at fixed 



stations. Each survey station is visited annually at the same time each successive 

 year to approximate similar ecological conditions. Specimens are taken with 

 trap and hoopnets and the data is handled on a catch and weight per net-hour basis. 

 Reproduction indices are gathered at the station by use of a 25 -foot drag seine. 

 Attempts to use a mark and recapture system of determining specific population 

 size has met with indifferent results. The geographical distribution of the various 

 species in the State is recorded. 



Statewide; began June 1949, continuing; R. E. Cleary and Harry Harrison, Proj. 



Ldrs. ; data in biology quarterly reports. 

 Address correspondence to: E. B. Speaker, Supt. of Biology, East 7th and Court 



Sts. , Des Moines, Iowa. 



State College 



1. Compilation of Data on Fish Growth and Biology. 



This project attempts to summarize all growth, length-weight, and similar data 

 on freshwater fishes of the United States and Canada and publishes tabular sunn- 

 maries in a handbook and periodical supplements. 



State Conservation Commission cooperating; began January 1-947, continuing; $1,000; 



report available is "Handbook of Fresh-water Fishery Biology" (1950; the first 



supplement (1953). 

 Address correspondence to: Dr. Kenneth D. Carlander, Dept. of Zoology and 



Entomology, Iowa State College, Ames, Iowa. 



2. Management of Small Ponds for Fish Production. 



Tests of marking and recovery methods used in estimating fish populations are be- 

 ing made; bluegills are being trapped in one pond to determine effects of popula- 

 tion reduction on growth and rate production; and population changes which have 

 taken place in ponds where fingerling and adult fish were added to unbalanced pop- 

 ulations are being studied. 



Knoxville and Ames, Iowa; State Conservation Commission cooperating; began June 

 1947, continuing; $2,500; quarterly progress reports (mimeographed) are avail- 

 able for limited distribution. 



Address correspondence to: Dr. Kenneth D. Carlander, Leader, Dept. of Zoology 

 and Entomology, Iowa State College, Ames, Iowa. 



3. Effect of Stream Conditions on Fish Populations. 



The emphasis this coming year will be upon the effects of water levels during the 

 winter months upon fish distribution and feeding and survival of food organisms. 

 Studies on reproduction will also be continued. 



Des Moines River, Boone County; State Conservation Commission cooperating; 



began June 1946, continuing; quarterly progress reports (mimeographed) are 



available for limited distribution. 

 Address correspondence to: Dr. Kenneth D. Carlander, Proj. Ldr. , Dept. of 



Zoology & Entomology, Iowa State College, Ames, Iowa. 



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