INDIANA (Cont. ) 



2. A Continuing Creel Census of an Innpo\indinent 



A creel census was initiated in June 1955, to collect data on the 1500-acre 

 lake on the Willow Slough State Game Preserve. Objectives include an accu- 

 mulation and analysis of the fishing pressure, total angler yield, nnovement of 

 fisiics, and year-to-year fluctuations in the fish populations. This impound- 

 ment is open to year-round fishing with the excpetion of the waterfowl season. 



Murphy Lake on the Willow Slough State Game Preserve, Newton County; 

 began June 1955, to close September 1959; H. E. McReynolds, Leader. 



Address inquiries to: H. E. McReynolds, Indiana Fisheries Research 

 Laboratory, Versailles, Indiana. 



Indiana University 



1. Seasonal Mortality Rates in a Bluegill Population 



The objective is to determine mortality rates in bluegill opoulations at dif- 

 ferent seasons of the year. The experiments are being carried out in control- 

 led ponds. They involve a multiple marking technique by which mortality rates 

 can be estimated over short periods of tinne. 



Began 1955, to close 1957; Joseph Hanegan, Leader. 



Address inquiries to: Joseph Hanegan, Department of Zoology, Indiana 

 University, Bloomington, Indiana. 



2. Effect of Temperature on the Digestion of Food by Bluegills 



Bluegills are fed a weighed amount of food, exposed to temperatures 

 ranging from 5° to 20° C. , and sacrificed at intervals to determine the amount 

 of food digested. 



Began 1956, to close 1957; Russell Malcolm, Leader. 



Address inquiries to: Shelby D. Gerking, Department of Zoology, Indiana 

 University, Bloomington, Indiana. 



3. The Efficiency of Food Utilization by a Fish Population 



Bottom fauna and fish populations are bemg studied simultaneously. Esti- 

 mates of food consumption by the fish will be compared directly with the amount 

 of food available. The experiment is being conducted on a small 8-acre lake 

 in northern Indiana. 



National Science Foundation cooperating; Wyland Lake; began May 1955, to 

 close May 1957; $10,000; Shelby D. Gerking, Leader. 



Address inquiries to: Shelby D. Gerking, as in No. 2 above. 



4. The Sensory Basis of Homing in the Longear Sunfish 



The importance of the olfactory and visual senses upon homing is being 

 studied by displacing fish from their home range. The fish are either blinded 

 or have the olfactory epithelium destroyed before displacement. 



Richland Creek, began June 1956, to close 1958; Gerald E. Gunning, 

 Leader. 



Address inquiries to: Gerald E. Gunning, Department of Zoology, Indiana 

 University, Bloomington, Indiana. 



St. Marys College 



1. Food Habits and Distribution of the Larvae of the Marine Lamprey, Petromyzon 

 marinus, in Rivers Flowing into Lake Michigan 



The objectives are to establish the food habits and distribution of the 

 marine lamprey during larval stages. 



St. Mary's College and the University of Notre Dame; began June 1955, 



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