jVo. 3 Report of the Department of Lands and Forests for 1950 



The small tractor was designed and built and is undergoing test and 

 development. 



A hose folding machine was designed and built. This was based on the original 

 model obtained from Mr. P. Hoffman and Mr. A. King at Timagami and Latchford. 



Some work was done on the use of dry ice and fog nozzles for fire fighting 

 and also on a number of smaller projects. 

 Entomology 



The arrangement of previous years of engaging Dr. C. E. Atwood as a con- 

 sultant was continued. Dr. Atwood is regularly employed as a Professor of Zoology 

 by the University of Toronto. The work done during the last year consisted of 

 examination and reports on a number of insect infestations. A heavy infestation of 

 Lecontei's sawfiy pine in the Sauble Forest was of particular interest. It was necessary 

 to determine the degree of infestation and the possibility of control. DDT spraying 

 at the rate of two pounds per acre gave satisfactory control. 

 Fisheries — Great Lakes 



Research in fisheries on the Great Lakes was centred at the South Bay Station 

 mentioned in last year's report. This Station has been enlarged and a laboratory, 

 cook-house, sleeping quarters, ice-house and boat shed, have been constructed. The 

 object of the experiment is to lish South Bay, which is almost completely land locked, 

 so as to put equal pressure on all elements of the fish population and ascertain if this 

 will result in an increase of the commercial and game fish. A further object of the 

 study is to find a sales outlet for coarse fish and fish by-products such as scales, fish 

 meal, etc. 



Studies of other factors affecting the fish population are being carried on at 

 the same time and the data recorded on punch cards for analysis. A creel census is 

 also conducted in this region. 



The study is co-operative with the Ontario Federation of Commercial Fisher- 

 men, the Anglers and Hunters Association and the Northern Outfitters' Association. 

 Dr. F. E. J. Fry of the University of Toronto is in charge of this project and of all 

 fisheries research for the Department. 



Fisheries — Inland Lakes 



This is directed by Dr. R. R. Langford under Dr. F. E. J. Fry. The work is 

 centred at the Fisheries Research Laboratory at Opeongo Lake and is confined largely 

 to the nearby lakes. Among other things, it is concerned with a creel census or record 

 of catch by anglers. Returns provide a valuable record of species and yield from 

 specific bodies of water. 



Another project is the fertilizing of lakes with commercial fertilizers, to increase 

 the amount of plant and animal plankton available for fish food. Cache, Brewer, 

 Costello and Little McCawley lakes have been fertilized. Chemical analyses of the 

 waters of treated lakes are being made to determine the need for fertilizer and its 

 effect. Plankton studies and studies of bottom fauna ar being conducted simul- 

 taneously with the fertilizing experiments both in the treated lakes and in untreated 

 control lakes. 



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