Parry Sound 

 The creel census was maintained on Three Mile Lake where minimum 

 size limits on yellow walleye were suspended in 1954 to allow better utilization 

 of the slow growing stock. Information was obtained on the production, fishing 

 quality, and growth rate. It is planned to resume the census in 1957 when the 

 effects of lifting the minimum length restriction will be more evident. 



PHYSICS RESEARCH 



The major activity in physical research continued to be in Great Lakes 

 studies. During the summer of 1955 synoptic surveys like those conducted 

 previously in Georgian Bay and Lake Huron were made in Lake Erie, and on a 

 smaller scale in Lake Ontario and Lake Simcoe. In Lake Erie they were made 

 in co-operation with the Ohio Department of Natural Resources and other U.S. 

 agencies. By means of these surveys, preliminary observations on the seasonal 

 changes in lake temperatures, currents, and chemical constitution have been 

 made. The Royal Canadian Navy, Toronto Harbour Police and Ontario 

 Provincial Police supplied many of the vessels for the work. In Georgian Bay, 

 a co-operative study with the University of Toronto was undertaken to measure 

 the value of gravity on islands in the Bay. In Lake Erie, a co-operative survey 

 of pollution in the lake was made with the Ontario Department of Health. 



In addition to the research on the Great Lakes, exploratory hydrological 

 work continued with assessment of the value of small dams for flood control and 

 of watershed research as applied to water supply problems in southern Ontario. 



WILDUFE RESEARCH 

 Wildlife Research Station, Algonquin Park 

 The field studies of beaver were continued, supplemented by projects 

 in the Chapleau and Kenora Forest Districts carried on in co-operation with the 

 district foresters. In addition, two laboratory studies, one an investigation of 



22 



