Female polar bear with three cubs, Akimiski Island. 



Intensive trials of the capabilities of remote sensing 

 devices for censusing big game were held through co- 

 operation with the National Aeronautical Establishment and 

 other agencies. Tests were made with air-borne sensing 

 devices in relation to big game management. This was pri- 

 marily an assessment of techniques and interpretation of 

 imagery obtained from infra-red scanning devices and 

 photography. 



PREDATORS 



Most of the work on predators to date has been confined 

 to wolves. Polar and black bears are now being considered, 

 and aerial flights to determine the numbers and distribution 

 of polar bears along the Hudson Bay wash were made. 



Studies continue on the predator — prey relationships be- 

 tween wolves and deer and beaver in an area where both 



groups are subject to human exploitation. The wolf popula- 

 tion has remained essentially stable. 



Radio collars, fitted to captured wolves, were used to 

 monitor their movements and study behavior patterns. 

 Work continued in the development of age determination 

 of wolves and coyotes. 



A study to determine the rate of reproduction of wolves 

 and coyotes throughout various sections of the province, 

 and to determine the influence of food and range conditions 

 on productivity, continues. 



It was learned during behavior studies of polar bears that 

 they are afraid of humans and have an apparent sense of 

 security in the sea. 



A report on all possible uces within the Department of 

 satellite photography is in preparation. The application of 

 data from these photographs to studies of waterfowl and 

 polar bears in the Hudson Bay lowlands is of particular 

 interest. 



PUBLICATIONS 



Published during the year ending March 31, 1969. 



FISHERIES SECTION 



Budd, ). C, F. E. J. Fry, and J. B. Smith. Survival of marked 

 Lake Trout in Lake Manitou, Manitoulin Island, Ontario. 

 J. Fish. Res. Bd. Canada, 25(11): 2257-2268. 



Eraser, J. M. Effect of air planting on domestic brook trout. 

 Prog. Fish-Cult. Vol. 30, No. 3, July, 1968. 



McDermott, L. A. and A. H. Berst. Experimental plantings of 

 brook trout {Salvelinus fontinalis) from furunculosis-in- 

 fected stock. J. Fish. Res. Bd. Canada, 25(12): 2643-2649. 



Ricker, W. E. and K. H. Loftus. Pacific Salmon Move East. 

 Fisheries Council of Canada, Annual Review, 1968. 



Ryder, R. A. Dynamics and Exploitation of Mature Walleyes, 

 Stizostedion vitreum vitreum, in the Nipigon Bay Region 

 of Lake Superior. J. Fish. Res. Bd. Canada, 25(7): 1347- 

 1376. 



Special Reports 



Martin, N. V. The Harkness Laboratory of Fisheries Research. 

 Department publication. 



Research Report 



A symposium on introduction of exotic species. Research 

 Report #82. 



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