ANNUAL REPORT, 1941-42 23 



A pond at the water-works pumping station in the City of Guelph was suggested 

 as a rearing pond for brown trout by the Wellington County Fish and Game Protective 

 Association. It was recommended that this pond should be given an experimental trial 

 but not on a large scale, as its value for the purpose is doubtful. 



Union Creek, concessions X to XV, Galway Township, County of Peterborough, 

 was studied from the standpoint of its suitability for fish and it was recommended as 

 being suitable for brown trout. 



The power dam at Healey Falls was examined regarding fish drawn into the 

 penstocks. This dam is located on the Trent River near Campbellford. It was recom- 

 mended that a grating be installed some distance away from the penstocks. 



The Lynn River, Woodhouse Township, County of Norfolk, was examined for 

 possible pollution and its suitability for brown trout. At the time of the in- 

 vestigation there was no evidence of active pollution. 



An investigation of the pollution of Guncotton Bay, on the Georgian Bay, vicinity 

 of Nobel, was made. It was found that the effluent repelled the fish from the area. If 

 it is found necessary to precipitate the toxic substances from solution, thorough fil- 

 tration or settling-out methods must be used in order to prevent any permanent dam- 

 age to this particular water-area. The damage being done at the time of the investi- 

 gation was only of a temporary nature and had no permanent effect on the bottom 

 condition of the bay. 



MacGregor Creek, a tributary of the Thames River, in the vicinity of Chatham, 

 was investigated and it was found that commercial effluents from industrial plants 

 and domestic sewage cause the pollution which should be controlled or eliminated. 



Early in August, residents of Rockland and Clarence reported dead fish of all 

 sizes and species on the shores of the Ottawa River. A joint investigation was con- 

 ducted by officials of the provinces of Ontario and Quebec, and recommendations were 

 submitted on the basis of the enquiry. 



Pollution of the Moira River between Corbyville and Belleville was investigated 

 and was found to be caused by industrial wastes, and recommendations were made with 

 a view to controlling the wastes in question. The precipitation and settling-out of 

 the wastes were not efficient due to the shallowness of the settling basins and the 

 porous rock underneath. It was recommended that the use of molasses in the oper- 

 ations should be confined to winter months when the water is colder and in greater 

 volume. 



An investigation was made in regard to washings of clay and mud into a stream 

 from a gravel pit at the northern city limits of Waterloo. It was found that 

 the stream bed was covered with clay and mud, that settling basins of adequate capacity 

 were required, and that the basins should be dredged out at intervals. Satisfactory 

 control of this particular pollution problem was undertaken by those responsible for it. 



During the period, September 8 to 12, 1941, nets of various mesh were set off 

 Port Maitland, Lake Erie, for the purpose of determining the efficiency of the different 

 mesh for the taking of perch. 



The Ontario Fisheries Research Laboratory of the Department of Zoology, Uni- 

 versity of Toronto, continued field and laboratory studies of lakes and streams in 

 Algonquin Park, 



Yearling speckled trout were provided by the Ontario Department of Game and 

 T'^isheries and were distributed through the co-operation of the Park staff and the 



