IOWA (Cont. ) 



$1000; Kenneth D. Carlander, Leader; reports available. 



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



9. Effects of Dredging on Shallow Prairie Lakes 



The Iowa State Conservation Commission has dredged several shallow 

 prairie lakes to decrease winterkill of fish, eliminate weedy shallows, and 

 to increase recreational values. This study was initiated to investigate the 

 biological effects of the dredging. Considerable attention has been placed on 

 the development of more efficient sampling designs for estin^ating bottom 

 fauna production. Food habits of the fish have been studied to determine the 

 extent to which various bottom faxina organisms are utilized. Growth and 

 population abundance of the principal fishes are also under study. 



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

 cooperating; North Twin Lake, near Rockwell City; began May 1951, closed 

 December 1956; $2200; Kenneth D. Carlander and John B. Owen, Leaders; 

 reports available. 



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



10. Gizzard Shad Ecology 



In 1954, gizzard shad increased greatly in North Twin Lake which had been 

 under study for 3 years and gave an opportunity to study the effects of the 

 sudden overabundance. This project is designed to determine fish population 

 dynamics and the ecology of gizzard shad. 



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

 cooperating; North Twin Lake, near Rockwell City; began June 1954, closed 

 July 1956; $2200; Kenneth D. Carlander and Joseph H. Kutkuhn, Leaders; 

 reports available. 



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



11. Creel Census Methods and Measurement of Sampling Errors 



Clear Lake, Iowa, like many other lakes, has many access points and 

 therefore a complete creel census is practically impossible. The present 

 project is developing a sampling method which will give a maximum of unbi- 

 ased data for estimating total harvest and success of fishing during the summer 

 months. Fishermen counts are made according to a predetermined pattern. 

 Boat livery records are compared to give an independent check on the esti- 

 mates. Data are being evaluated to determine sizes of samples needed to get 

 estimates within various confidence limits. 



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

 and Sport Fishing Institute cooperating; Clear Lake; began July 1953, closed 

 December 1956; $2200; Kenneth D. Carlander and Charles DiCostanzo, Leaders; 

 reports available. 



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



KANSAS 



Forestry, Fish and Game Commission 



1. Reclamation of Artificial Fishing Lakes 



A reclamation project is initiated when periodic lake surveys indicate 

 that the species composition and relative abiandance of the fish of a lake are 

 such that they are responsible for continued unsatisfactory fishing conditions. 

 The fish populations are removed from such lakes by draining and seining, or 

 through eradication with fish toxicants. Habitat improvement is practiced in 



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